CN101567705B - Mobile terminal and uplink channel local frequency regulation method - Google Patents
Mobile terminal and uplink channel local frequency regulation method Download PDFInfo
- Publication number
- CN101567705B CN101567705B CN200910129178.5A CN200910129178A CN101567705B CN 101567705 B CN101567705 B CN 101567705B CN 200910129178 A CN200910129178 A CN 200910129178A CN 101567705 B CN101567705 B CN 101567705B
- Authority
- CN
- China
- Prior art keywords
- frequency
- local oscillation
- channel
- oscillation circuit
- local
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/01—Reducing phase shift
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
- H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
- H03J1/0041—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor for frequency synthesis with counters or frequency dividers
- H03J1/005—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor for frequency synthesis with counters or frequency dividers in a loop
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0035—Synchronisation arrangements detecting errors in frequency or phase
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Mobile Radio Communication Systems (AREA)
- Transceivers (AREA)
Abstract
The invention relates to a mobile terminal uplink channel local oscillation frequency regulation method, includes completing regulation of downlink channel local frequency fr by mobile terminal; setting local oscillation frequency control parameter of uplink channel according to the requirement of regulating ft to 2f0-fr, during regulation of local oscillation frequency ft of uplink channel by mobile terminal; wherein f0 is the carrier frequency when signal sent by the base station in the current work channel is not biased. Correspondingly, the invention provides a mobile terminal including a local oscillation circuit and a frequency reference source thereof, a storage module, a downlink regulation module, a searching module, and an uplink regulation module. The mobile terminal is capable of regulating the carrier frequency on the receiving and transmitting channel respectively according to the moving state, effect of Doppler frequency shift is counteracted, multi-access interference between users can be reduced. Effect to communication system in OFDM multi-access mode is especially outstanding.
Description
Technical field
The present invention relates to mobile communication system terminal is portable terminal, relates in particular to the method for adjustment of the local frequency of a kind of portable terminal and data feedback channel thereof.
Background technology
Existing mobile communication terminal is that portable terminal comprises a local oscillation circuit (localoscillator abbreviates LO as) usually, is called for short local oscillation circuit, and the frequency reference signal for generation of this locality is also referred to as local oscillation signal.Electromagnetic wave signal takes down and sends into low noise amplifier by antenna from air interface, together send into frequency mixer with the frequency reference signal of local oscillation circuit generation then, frequency mixer utilizes local oscillation signal that its radiofrequency signal that receives is carried out down-conversion, finishes reception information thereby again the signal after this down-conversion is sent into the subsequent treatment unit.Transmission information is the same with the processing mode of the information of reception, is the reverse flow process of signal.
Variant between the frequency of the general and portable terminal local oscillation signal of the carrier frequency of the radiofrequency signal that portable terminal is received from air interface, usually with method for processing signals the estimating carrier frequencies of radiofrequency signal is come out, thereby adjust the frequency of the local oscillation signal of local oscillation circuit generation indirectly in order to the frequency of adjusting local oscillation circuit frequency reference source, make the frequency of local oscillation signal consistent with the carrier frequency of the radiofrequency signal of receiving from air interface, can reduce the error rate.Simultaneously, the data feedback channel of portable terminal is because also adopt the frequency reference source identical with down going channel, and the carrier frequency that therefore sends signal has also been adjusted to equidirectional (frequency increases or reduces) simultaneously.As, at a time division multiple access (Time Division Multiple Access, abbreviating TDMA as) (identical frequency is used in transmitting-receiving in the system, but use the different time, therefore for the simplified receiver structure, go up down-conversion with regard to the signal that allows transceiver channel use same LO circuit to produce usually), as portable terminal with the speed of relative base station 240km/h away from the base station, the employed carrier frequency of signal that the base station sends is 1900Mhz, so according to the Doppler effect principle, the carrier frequency of the signal that portable terminal is received should be about 1900Mhz-400hz=1899999.6khz, and wherein 400Hz is Doppler frequency shift.Terminal is passed through channel estimating, estimate the carrier frequency of this 1899999.6khz at receiving terminal, and with the operating frequency in the frequency reference source of LO to low direction adjustment, make the output frequency of LO be reduced to 1899999.6khz from 1900000Khz, thereby reach the effect of compensating for frequency offset.But according to preceding structure, transmitting terminal also has been adjusted simultaneously, also become 1899999.6khz, problem has just occurred, because terminal is in motion, so because Doppler effect at this moment away from the base station, in base station side, the signal that receive the base station is approximately 1899999.6khz-0.4khz=1899999.2khz exactly, and the carrier frequency that sends with original base station has just produced the frequency deviation of 800hz, and Doppler frequency shift has been amplified one times.
Country is carrying forward vigorously synchronous code division multiple access (the TimeDivision-Synchronous Code Division Multiple Access of time-division of independent intellectual property right at present, abbreviate TD-SCDMA as) the 3G (Third Generation) Moblie standard, the follow-up evolution of this standard is called the Long Term Evolution (TD-SCDMA Long Term Evolution abbreviates TD-LTE as) of TD-SCDMA.In the TD-LTE communication system, what the uplink multi-address scheme adopted is that OFDM inserts (Orthogonal FrequencyDivision Multiple Access, abbreviate OFDMA as), each subcarrier spacing generally is 12Khz～15Khz, if that use is 15Khz, the Doppler frequency shift of this 0.8Khz is causing the serious inter-carrier interference of unique user simultaneously so, also can cause the multiple access of different user to disturb at the base station receiver side, reduce power system capacity, increase the error rate.In this special multi-address communication system of OFDMA, the problem that Doppler frequency deviation causes base station side can not be given the base station and be handled, because what numerous users sent should arrive the base station after the mobile stack mutually owing to Doppler frequency shift again at the signal that frequency band is isolated, the base station has had no idea to have distinguished.So this problem is preferably handled by terminal, the signal that the base station is received begins just to be in the good isolation state from the source end.
Summary of the invention
The invention provides the method for adjustment of the local frequency of a kind of portable terminal and data feedback channel thereof, can reduce frequency shift (FS) that Doppler effect causes to the deterioration of communication performance.
In order to address the above problem, the invention provides a kind of method of adjustment of local frequency of portable terminal data feedback channel, comprising:
Portable terminal is finished the adjustment to the local frequency fr of down going channel;
When described portable terminal is adjusted the local frequency ft of data feedback channel, the local frequency that data feedback channel is set according to the requirement that ft is adjusted into 2f0-fr controls parameter, and this local frequency control parameter comprises the frequency multiplication value of control voltage and the local oscillation circuit in local oscillation circuit frequency reference source; Wherein, f0 is the carrier frequency of base station when the signal of work at present channel transmission does not have frequency deviation, and the local frequency that adopts when receiving this signal when static with respect to the base station with portable terminal control parameter is represented.
Further, above-mentioned method of adjustment also can have following characteristics:
Before described local frequency up, down going channel adjusted, when described mobile terminal configuration portable terminal is static with respect to the base station, receive the corresponding relation data of the control information of voltage in working channel information, frequency multiplication information and local oscillation circuit frequency reference source that the base station obtains earlier when the signal that each working channel sends;
After described portable terminal is finished adjustment to the local frequency fr of down going channel, be identified for representing the local frequency control parameter of the down going channel of this fr, and search described corresponding relation data according to the work at present channel, obtain the corresponding local frequency control parameter that is used for expression f0, determine ft is adjusted into the local frequency control parameter of the data feedback channel that 2f0-fr need arrange then.
Further, above-mentioned method of adjustment also can have following characteristics:
When described portable terminal carries out the local frequency adjustment of down going channel, determine the current control information of voltage Vc that outputs to the local oscillation circuit frequency reference source of down going channel
nReception frequency multiplication value R with local oscillation circuit
r, and according to work at present channel and described control information of voltage Vc
nSearch described corresponding relation data, obtain corresponding frequency multiplication value R
N., m
Described portable terminal carries out the local frequency adjustment of data feedback channel, adopts the control voltage in the local oscillation circuit frequency reference source identical with down going channel, and the frequency multiplication value of described local oscillation circuit data feedback channel is set to R
t, R
t=2R
N., m-R
r
Further, above-mentioned method of adjustment also can have following characteristics:
Working channel information in the described corresponding relation data represents that with the wireless communication Taoist monastic name control information of voltage is to represent with control magnitude of voltage or its index in local oscillation circuit frequency reference source, and frequency multiplication information is to represent with the frequency multiplication value of local oscillation circuit.
Further, above-mentioned method of adjustment also can have following characteristics:
The local oscillation circuit frequency reference source of described portable terminal has a plurality of operating temperature ranges, in described portable terminal, at each operating temperature range in local oscillation circuit frequency reference source, disposed one group of corresponding relation data that in this operating temperature range, detect the control information of voltage in the working channel information, frequency multiplication information and the local oscillation circuit frequency reference source that obtain respectively;
Described portable terminal was earlier selected one group of corresponding relation data will using according to the working temperature in the local oscillation circuit frequency reference source of detecting in real time before searching described corresponding relation data.
Further, above-mentioned method of adjustment also can have following characteristics:
Described corresponding relation data are to obtain in the process that described portable terminal or portable terminal of the same type are calibrated, particularly, in this calibration process, portable terminal remains static with respect to the base station, the base station sends signal to described portable terminal on each working channel, described portable terminal carries out channel estimating and finishes local frequency adjustment to the local oscillation circuit down going channel, for each working channel, record the frequency multiplication value of the down going channel that described portable terminal obtains under different control voltage, namely obtain described corresponding relation data.
Portable terminal provided by the invention comprises local oscillation circuit and frequency reference source thereof, memory module, descending adjusting module, searches module and up adjusting module, comprising:
Described local oscillation circuit and frequency reference source thereof, be used for according to the control voltage in the local oscillation circuit frequency reference source of down going channel and receive the local oscillation signal that the frequency multiplication value produces down going channel, according to the control voltage in the local oscillation circuit frequency reference source of data feedback channel with receive the local oscillation signal that the frequency multiplication value produces data feedback channel;
Described memory module, the corresponding relation data of the control information of voltage in the reception base station obtains when the signal that each working channel sends when static with respect to the base station for the preservation portable terminal working channel information, frequency multiplication information and local oscillation circuit frequency reference source;
Described descending adjusting module be used for to be adjusted the control voltage in local oscillation circuit frequency reference source and the reception frequency multiplication value of local oscillation circuit, and the local frequency fr of down going channel is adjusted on the carrier frequency that receives signal;
The described module of searching for the described corresponding relation data of searching memory module according to the work at present channel, obtains corresponding local frequency control parameter and outputs to up adjusting module;
Described up adjusting module, be used for when the local frequency ft to the data feedback channel local oscillation circuit adjusts, the control voltage in local oscillation circuit frequency reference source of data feedback channel and the frequency multiplication value of local oscillation signal are set according to the requirement that ft is adjusted into 2f0-fr, wherein, f0 is the carrier frequency of base station when the signal of work at present channel transmission does not have frequency deviation, and the local frequency that adopts when receiving this signal when static with respect to the base station with the portable terminal of preserving in described memory module control parameter is represented.
Further, above-mentioned portable terminal also comprises memory module and search module, wherein:
When described descending adjusting module carries out the local frequency adjustment of down going channel, determine the current control voltage Vc that outputs to the local oscillation circuit frequency reference source of down going channel
nReception frequency multiplication value R with local oscillation circuit
r
The described module of searching is used for working channel information and described control information of voltage Vc according to work at present channel correspondence
nSearch described corresponding relation data and obtain corresponding frequency multiplication value R
N., m, output to up adjusting module;
When the local frequency that described up adjusting module carries out data feedback channel is adjusted, adopt the control voltage in the local oscillation circuit frequency reference source identical with down going channel, the frequency multiplication value of described local oscillation circuit data feedback channel is set to R
t, R
t=2R
N., m-R
r
Further, above-mentioned portable terminal also comprises temperature sensor, wherein:
Described temperature sensor is used for detecting in real time the current working temperature in local oscillation circuit frequency reference source and outputs to the described module of searching;
The corresponding relation data of preserving in the described memory module have many groups, correspond respectively to an operating temperature range in local oscillation circuit frequency reference source;
The described module of searching was chosen the corresponding relation data that will use according to the working temperature in the local oscillation circuit frequency reference source of detecting in real time earlier before searching described corresponding relation data.
Further, above-mentioned portable terminal also comprises channel estimation module and calibration module, wherein:
Described calibration module, be used for the process of calibrating to described portable terminal or portable terminal of the same type, when portable terminal remains static with respect to the base station, receive the signal that the base station sends at each working channel, with the collaborative local frequency adjustment of finishing the local oscillation circuit down going channel of channel estimation module, for each working channel, record the frequency multiplication value of the down going channel that described portable terminal obtains under different control voltage, obtain described corresponding relation data.
More than by specific Data Structure Design, keep the true carrier frequency that the base station sends signal, be used for portable terminal and estimate Doppler frequency shift at the volley.Add the portable terminal transceiver channel and use different local oscillation signals, just can adjust the carrier frequency of portable terminal transceiver channel according to mobile status respectively, offset the influence of Doppler frequency shift, the multiple access that can reduce between up user disturbs.Its objective is the decline that Doppler frequency shift produces under the antagonism high-speed mobile, to adopting the communication system of OFDMA (frequency division orthogonal multiplex multiple access) multi-access mode, especially outstanding as TD-LTE (long evolving system of TD system) effect.Further, corresponding relation data between working channel when static with respect to the base station by the good portable terminal of configured in advance, frequency multiplication value and the control voltage, the base station is in the actual frequency of the signal of each channel transmission, the influence that the frequency difference that elimination portable terminal and base station side exist brings in the time of can representing to descend no frequency deviation exactly with the parameter of mobile terminal side.
Description of drawings
Fig. 1 is the flow chart that embodiment of the invention local frequency is adjusted.
Fig. 2 is the functional block diagram of embodiment of the invention local frequency adjusting device.
Fig. 3 is the hardware connection layout corresponding to Fig. 2.
Fig. 4 is the another kind of hardware connection layout corresponding to Fig. 2.
Embodiment
Below in conjunction with accompanying drawing specific embodiments of the invention are described in detail, at first introduce the process of setting up of the linkage work information table of local oscillation circuit, as described below:
Present embodiment portable terminal such as mobile phone need be set up the linkage work information in local oscillation circuit and frequency reference source thereof when remaining static with respect to the base station before dispatching from the factory, need set up 4 linkage work information forms in the present embodiment altogether.Wherein one structure is shown in table 1 hereinafter, comprise 3 operating temperature range T in local oscillation circuit frequency reference source and the linkage work information table index Index in corresponding local oscillation circuit and frequency reference source thereof, purpose is to seek the linkage work information table of each operating temperature range correspondence.
Because the performance of VCTCXO is closely related with temperature, therefore need set up linkage work information table under the relevant temperature at different temperature ranges, general characteristic according to concrete frequency reference source of adopting arranges, adopt the VCTCXO product K T21P-DCV 28A-19.200M-T of company of Kyocera as present embodiment, its working temperature is divided into three scopes (30 ℃～-10 ℃), (10 ℃～60 ℃), (60 ℃～80 ℃), when being operated in these three different scopes, corresponding different work characteristics.Engineering thinks that error can ignore in same temperature range, thinks the characteristic unanimity substantially.
| Frequency reference source operating temperature range | T1 (-30℃～-10℃) | T2 (-10℃～60℃) | T3 (60℃～80℃) |
| Tables of data index Index | 1 | 2 | 3 |
Table 1
The scope of the real time temperature the when T of table 1 first row refers to the frequency reference source work of local oscillation circuit is got by the temperature sensor collection, because its output frequency that can influence the frequency reference source is thought of as variable factor with it.
Index refers to the frequency reference source under certain operating voltage and operational temperature conditions in the table 1, the tables of data index that local oscillation circuit and the interlock of frequency reference source change.
The structure of other three linkage work information tables is identical, shown in table 2 hereinafter, the corresponding relation data of the control information of voltage (representing with control voltage Vc or its index) in the working channel information (ch represents with the wireless communication Taoist monastic name) when its content comprises local oscillation circuit work, the frequency multiplication information (R represents with the frequency multiplication value) of local oscillation signal and local oscillation circuit frequency reference source.The control information of voltage in frequency multiplication information and local oscillation circuit frequency reference source is two control parameters of local frequency.Each table comes index by the index in the table 1 respectively.These linkage work information tables are saved in portable terminal this locality, in the place that is easy to read such as ROM (read-only memory), internal memory or other portable terminals.Voltage-controlled compensation crystal oscillator (Voltage Controlled Temperature CompensatedCrystal Oscillator is adopted in local oscillation circuit frequency reference source in the present embodiment, abbreviate VCTCXO as), also can adopt crystal oscillator non-temperature compensation or pottery etc.
The corresponding wireless communication Taoist monastic name of the frequency ch of the local oscillation signal of output is decided by the employed communication system of portable terminal during local oscillation circuit work.Here suppose a TDD system, channel is the centre frequency of first channel or claims carrier frequency with 1920Mhz from 1920Mhz, every 1.92Mhz a channel is set, and is provided with 50 channels altogether, and then the subscript value of ch can be 1 to 50 these 50 integers.
Frequency multiplication value R, because local frequency is by obtaining the reference frequency frequency multiplication, so the corresponding frequency multiplication value of each local frequency value.In the TDD system of as above supposition, first channel carrier frequency is 1920Mhz, and its channel number is ch
1As be operated in the frequency reference source control voltage be Vc
101The reference frequency 19.2Mhz that exports during=1.4V is benchmark, then Dui Ying frequency multiplication value R
101,1=1920/19.2=100.The carrier frequency of second channel is 1921.92Mhz, and its channel number is ch
2, corresponding frequency multiplication value R
101,2Be 101, and the like.The local oscillation circuit of present embodiment adopts two registers of the same type, a frequency multiplication value (be also referred to as and receive the frequency multiplication value) that is used for storage down going channel local oscillation signal, and another is used for the frequency multiplication value (be also referred to as and send the frequency multiplication value) of storage data feedback channel local oscillation signal.
The control voltage Vc of VCTCXO by adjusting the control voltage of this VCTCXO, thereby adjusts the frequency of the frequency reference signal of VCTCXO output.
Table 2
R refers to the frequency multiplication value of local oscillation signal in table 2 gauge outfit, generally namely refers to the value of data in the frequency multiplication register that local oscillation circuit comprises.
Vcontrol refers to the control voltage that the frequency reference source of local oscillation circuit receives in table 2 gauge outfit, and this voltage is generally exported by baseband processor.The subscript n of Vc parameter is the full control range ability of VCTCXO under certain stepped voltage in the table 2, for example, stepping control voltage 0.01V, and the control voltage range of the VCTCXO product K T21P-DCV 28A-19.200M-T shown in the present embodiment is 0.4V～2.4V, then n is 201, i.e. Vc
nFrom Vc
1To Vc
201, Vc
1Corresponding 0.4V, Vc
201Corresponding 2.4V.
The subscript m of ch parameter is integer in the table 2, and scope is m ∈ [1,50], and the scope of the subscript n of Vcontrol parameter is n ∈ [1,201].
In the present embodiment, data in the linkage work information table are to utilize that calibration procedure obtains in the baseband processor of portable terminal, in order to cooperate calibration procedure to obtain information accurately, portable terminal also needs to install a temperature sensor (such as thermistor, can select voluntarily as required), this transducer and VCTCXO can be amplexiformed, in order to the temperature of real-time detection VCTCXO.
For obtaining the content in the linkage work information table 2, the portable terminal calibration of can before dispatching from the factory, starting shooting, in order to obtain needed information in the above-mentioned linkage work information table, this calibration process is under the static situation in portable terminal and base station to be finished, and the process of obtaining this linkage work information after the start comprises:
Step 1: start, the T2 scope (usually just get normal temperature get final product) of working temperature in linkage work information table 1 of control portable terminal starts the self calibration program.
Step 2: select a channel, default setting is from inserting first channel, the electromagnetic wave signal that portable terminal reception base station sends here;
Step 3: after portable terminal receives electromagnetic wave signal, keep the control voltage Vc of local frequency reference source
101Be 1.4V, the carrier frequency that the method for recycling channel estimating sends the base station is estimated in this locality (portable terminal) and the local frequency of down going channel is adjusted, after adjustment was finished, this local frequency equated with the carrier frequency that receives signal, in the present embodiment this carrier frequency is designated as f
R1, this carrier frequency also be the base station in the static absolute reference frequency of respective channel signal transmitted, the frequency of the signal that the base station sends in respective channel when also namely having frequency deviation.Read down going channel frequency multiplication register content R this moment by baseband chip
rBe saved in fixed position in the linkage work information table, as first row, the 101st row.I.e. Vc in the table 2
101Row and R
1The table content R of row institute infall
101,1Even, R
101,1=R
rSimultaneously at Vc
101The place inserts 1.4V.
And then, change the control voltage Vc of VCTCXO, the step value that is decided to be here according to 0.01V floats up and down around 1.4V, repeats the work of this step, obtains the total data (R of first row in the table 2
1,1～R
201,1).And with these reference records in the linkage work information table;
Step 4: select next channel, repeated execution of steps two and three, the content of 50 channels all obtains in table 2, namely obtains a complete linkage work information table, for it gives index 2, corresponding to the 2nd row, the 2nd row infall content of table 1;
Step 5: change the working temperature of portable terminal, make it be operated in the T1 temperature range shown in the table 1, start the self calibration program, repeating step two～four then, obtain second linkage work information table.Change the working temperature of portable terminal afterwards again, make it be operated in the T3 temperature range shown in the table 1, start the self calibration program, repeating step two～four obtains the 3rd linkage work information table.At this moment, all linkage work information tables are set up and are finished.
After the linkage work information table is set up, it is saved in the portable terminal, in when work, be the local frequency that the corresponding relation data of the control information of voltage in the frequency multiplication information of working channel information, local oscillation signal of local oscillation circuit and local oscillation circuit frequency reference source are adjusted its data feedback channel in order to portable terminal according to wherein linkage work information.
Though present embodiment has been set up 3 linkage work information tables corresponding to different temperatures, this disposes at a concrete VCTCXO product.Those skilled in the art can understand, under other condition, as the device that adopts other type is as local oscillation circuit frequency reference source, and working temperature may be divided into the scope more than two or three, needs this moment the number of the linkage work information table of configuration also can respective change.If again in conjunction with concrete applied environment such as portable terminal when a variations in temperature small region is used, also may only need to consider some operating temperature ranges, at this moment, need set up a linkage work information table, do not need to have come index with table 1 yet.
Present embodiment is that the local oscillation circuit frequency reference source all possible control voltage Vc under each channel is detected one by one to an operating temperature range, and in other embodiments, also the control voltage that can only use part detects.
Above-mentioned linkage work information also is not limited to when the start calibration and obtains, and also can use the data that similar mobile terminal test is obtained, and perhaps obtains by emulation, perhaps obtains etc. from technical literature, and the present invention does not do limitation to this.
Here be noted that above-mentioned calibration is in order accurately to represent not have the frequency of the signal that base station when relatively moving sends at each channel with the parameter of portable terminal.Because the frequency of base station and portable terminal, time all are to be benchmark with local separately reference source, both are definitely inequal.And by the calibration process under the above-mentioned inactive state, when the base station sends signal at each channel, portable terminal is adjusted to carrier frequency with the base station when consistent with the local frequency of down channel local oscillation signal, and the control parameter of the local frequency of employing namely can accurately represent not have the frequency of moving the signal that base station when inclined to one side sends at each channel.Thereby under any motion state, all can obtain frequency reference accurately, can in conjunction with the local frequency of down going channel, data feedback channel be adjusted as benchmark.
If terminal is in the low-speed motion state with respect to the base station when carrying out above-mentioned calibration, the result who calibrates is influenced not quite, its result also is available.The result who obtains when but this is just with the relative base station of portable terminal low-speed motion is approximately the result of the relative base station of portable terminal when static, should be considered as a kind of means that are equal to.
How further specify portable terminal below in conjunction with accompanying drawing utilizes this linkage work information table to adjust the local frequency of its data feedback channel, thereby realization Doppler shift compensation, be illustrated in figure 1 as the present embodiment portable terminal and adjust the flow process of the local frequency of data feedback channel, comprising:
Step 210: portable terminal receives the electromagnetic wave signal that the base station sends after receiving and adjusting instruction;
Step 220: portable terminal estimates (exploitable channel estimation approach) with the carrier frequency of a certain working channel signal that the base station sends in this locality, then by adjusting the control voltage Vc of VCTCXO
nReception frequency multiplication value R with local oscillation circuit
r, local frequency is adjusted on the carrier frequency that receives signal;
Step 230: portable terminal is read the current working temperature of VCTCXO by the temperature sensor that amplexiforms with VCTCXO from baseband processor, in table 1, find the index Index of this working temperature corresponding temperature range indication, find the linkage work information table in corresponding local oscillation circuit and frequency reference source thereof, from this form, according to the wireless communication Taoist monastic name ch of work at present
mWith the current control voltage Vc that outputs to VCTCXO
n, read the frequency multiplication value R in the table
N., m
In other embodiments, as have only more than the linkage work information table, the above-mentioned current operating temperature of reading can omit with the operation of searching corresponding linkage work information table.
The wireless communication Taoist monastic name ch of work at present
mBe portable terminal when carrying out the start cell search process, distribute to portable terminal by the base station according to the wireless channel operating position, communication subsequently will be carried out in a certain definite frequency.
Step 240: the R that will from the linkage work information table, read
N., mFrequency multiplication value R with the down going channel local oscillation signal of current local oscillation circuit
r(subscript r represents to receive) compares, and calculates difference DELTA R=R
N, m-R
rIf Δ R is negative value, namely be equivalent to the carrier frequency height of wireless channel of the local oscillation signal frequency ratio work at present that is used for down going channel of local oscillation circuit output this moment.According to the Doppler effect principle, with regard to being described, portable terminal moving along the direction near the base station, if Δ R is on the occasion of illustrating that so portable terminal is moving away from the base station;
Step 250: according to difference DELTA R=R
N, m-R
r, the frequency multiplication value that calculates the local oscillation signal of data feedback channel is R
N, m+ Δ R=2R
N, m-R
r
During Practical Calculation, step 240 and 250 can be unified, as long as calculate the frequency multiplication value.
Step 260: with the frequency multiplication value R of the data feedback channel of local oscillation circuit
t(subscript t represents to send) is set to 2R
N, m-R
r, i.e. R
t=2R
N, m-R
rAdjustment finishes;
Can export control signal to R by baseband processor
tArrange.In addition, adopt the control voltage Vc in down going channel identical local oscillation circuit frequency reference source at data feedback channel this moment
n
Step 270: after the local frequency adjustment of a data feedback channel finishes, (becoming situation during according to concrete channel this cycle time determines to wait for the adjustment cycle time, the wave path that is formed by the portable terminal operational environment determines, general each communication standard can provide a recommendation according to the actual conditions modeling), arrive when the adjustment cycle time, send one and adjust instruction, return step 210.
By the adjustment to the local frequency of data feedback channel, when arriving the base station, the electromagnetic wave signal that makes this portable terminal send gets angle from the base station, and carrier frequency is f just in time just
r, offset the influence of Doppler frequency shift, thereby reduced to destroy up user's the orthogonality of intercarrier and multiple access and the channel disturbance brought.
With reference to functional block diagram shown in Figure 2, the module that the present embodiment portable terminal is relevant with the local frequency adjustment comprises local oscillation circuit and frequency reference source, calibration module, memory module, descending adjusting module, temperature sensor, searches module and up adjusting module, wherein:
Local oscillation circuit and frequency reference source thereof, for the control voltage and the local oscillation signal that receives frequency multiplication value generation down going channel according to down going channel local oscillation circuit frequency reference source, and according to the control voltage in data feedback channel local oscillation circuit frequency reference source and the local oscillation signal of transmission frequency multiplication value generation data feedback channel.
The concrete structure of present embodiment local oscillation circuit and and local oscillation circuit frequency reference source (be example with VCTCXO), baseband processor between annexation as shown in Figure 3, local oscillation circuit comprises a phase-locked loop (PLL), and one receives frequency multiplier circuit and sends frequency multiplier circuit.Have one to receive the frequency multiplication register in this reception frequency multiplier circuit, be used for preserving the reception frequency multiplication value that arranges, have one to send the frequency multiplication register in this transmission frequency multiplier circuit, be used for preserving the transmission frequency multiplication value that arranges.Namely, the local oscillation circuit that present embodiment adopts contains two frequency multiplication registers of the same type respectively, a frequency that is used for the employed local oscillation signal of control down going channel, another is used for the frequency of the employed local oscillation signal of control data feedback channel, and the value of register all can be arranged and be read by baseband processor.VCTCXO is according to the control voltage Vc of baseband processor output, and the output frequency reference signal is to phase-locked loop, and the output signal of phase-locked loop is input to simultaneously and sends frequency multiplier circuit and receive frequency multiplier circuit, and namely the uplink and downlink passage uses identical control voltage.In another embodiment, two phase-locked loops can be set also in the local oscillation circuit, receive the frequency reference signal of two VCTCXO outputs respectively, the output signal of these two phase-locked loops is imported respectively and is received frequency multiplier circuit and send frequency multiplier circuit.As shown in Figure 4.
Calibration module, be used for the calibration process when static with respect to the base station by portable terminal, detection obtains the linkage work information in local oscillation circuit and frequency reference source thereof and is kept at memory module, if need to consider a plurality of operating temperature ranges in local oscillation circuit frequency reference source, all need detect the corresponding linkage work information that obtains to each operating temperature range.
Memory module, be used for preserving the linkage work information in local oscillation circuit and frequency reference source thereof, the corresponding relation data of the control information of voltage (available control magnitude of voltage Vc or its index are represented) in the working channel information (available wireless channels ch represents) when comprising local oscillation circuit work, frequency multiplication information (but representing with frequency multiplication value R) and local oscillation circuit frequency reference source.
Descending adjusting module is used for after receiving the adjustment instruction, by adjusting the control voltage Vc of VCTCXO
nWith the reception frequency multiplication value R that adjusts local oscillation circuit
r, the local frequency of down going channel is adjusted on the carrier frequency that receives.This module usually can be followed the channel estimation module collaborative work.
Temperature sensor is used for detecting in real time the current working temperature of VCTCXO and outputs to and searches module.This module is optional.
Search module, be used for the working temperature place operating temperature range current according to VCTCXO, find the linkage work information in corresponding local oscillation circuit and frequency reference source thereof, according to the wireless communication Taoist monastic name ch of work at present
mWith the current control voltage Vc that outputs to VCTCXO
n, determine corresponding frequency multiplication value R
N., mAnd output to up adjusting module.
Up adjusting module is used for the R according to input
N., m, calculate the frequency multiplication value R of the local oscillation signal of data feedback channel
N, m+ Δ R=2R
N, m-R
r, and the output control signal, with the data feedback channel frequency multiplication register R of local oscillation circuit
tValue be set to 2R
N, m-R
r, and the control voltage Vc in the local oscillation circuit frequency reference source of adopting
nIdentical with down going channel.In the present embodiment, R
rAnd Vc
nCan output to up adjusting module together by searching module, but also can output to up adjusting module by descending adjusting module.
Above-mentioned calibration module, up adjusting module, descending adjusting module and the function of searching module can be realized by baseband processor.
The carrier frequency of portable terminal transceiver channel of the present invention is used different local frequencies according to Doppler frequency shift, thereby can offset Doppler frequency shift, reduces frequency shift (FS) that Doppler effect causes to the deterioration of communication performance.In theory, in order to offset Doppler frequency shift, after portable terminal is finished adjustment to the local frequency fr of down going channel, when the local frequency ft to the data feedback channel local oscillation circuit adjusts, the local frequency control parameter of data feedback channel should be set according to the requirement that ft is adjusted into 2f0-fr, comprise the frequency multiplication value of control voltage and the local oscillation signal in local oscillation circuit frequency reference source; Wherein, f0 is the carrier frequency of base station when the signal of work at present channel transmission does not have frequency deviation.But though the frequency of definition ch1 is 1920Mhz in the communication standard, the frequency of base station and portable terminal, time all are to be benchmark with own local reference source.Carrier frequency when need base station signal not had frequency deviation converts local quantifiable, concrete parameter to, as: frequency multiplication register value and Vc voltage.Accurately, truly know the frequency of the signal that base station side sends by these two parameters, the standard frequency of definition is specialized.Eliminate the influence that distinct device frequency difference and different motion states are brought.
In above-described embodiment, be to obtain the relative base station of portable terminal earlier when static, corresponding relation between the control voltage of the working channel information during local oscillation circuit work and local frequency control parameter local oscillation circuit reference frequency source, the frequency multiplication value of local oscillation signal, and be configured in the portable terminal.Like this, after the adjustment of the local frequency of finishing the down going channel local oscillation circuit, can directly represent frequency offset information with the difference of frequency multiplication value, when the local frequency of data feedback channel local oscillation circuit is adjusted, keep the control voltage in local oscillation circuit frequency reference source when constant, directly obtain the transmission frequency multiplication value of data feedback channel by the method for above-described embodiment, can satisfy the requirement of the local frequency ft=2f0-fr of data feedback channel local oscillation circuit.Need to prove that the linkage work information table of setting up in above-described embodiment can be simplified calculating, but is not to be absolutely necessary.As long as preserve corresponding corresponding relation data.
Based on this thought, can also obtain other a plurality of embodiment, for example, in another embodiment, can use different PLL and frequency multiplier circuit with down going channel at data feedback channel, two PLL are connected respectively to different local oscillation circuit reference frequency sources, and these two local oscillation circuit reference frequency sources receive different control voltage respectively.Based on such structure, just can control respectively the control voltage in the local oscillation circuit frequency reference source of uplink and downlink passage, portable terminal is finished the local frequency adjustment of down going channel in step 220, has determined the control voltage Vcr in local oscillation circuit frequency reference source of down going channel and the reception frequency multiplication value R of local oscillation circuit
rAfter, can search corresponding linkage work information table, find the wireless communication Taoist monastic name ch with work at present
mWith frequency multiplication value R
rCorresponding control voltage Vc, then based on same principle, when portable terminal carried out the local frequency adjustment of data feedback channel, can adopt the frequency multiplication value identical with down going channel was R
t=R
rBut the control voltage Vct in the local oscillation circuit frequency reference source of local oscillation circuit data feedback channel is adjusted to certain value in the other direction, the side-play amount equal and opposite in direction (or difference minimum) of the carrier frequency when this working channel signal that this value should make the local frequency of data feedback channel and down going channel send with respect to the base station does not have frequency deviation and direction is opposite, concrete value can be determined according to the relation curve between control voltage and the local oscillation circuit local frequency.
The above anyly is familiar with those skilled in the art in the technical scope that the present invention discloses, and the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (9)
1. the method for adjustment of the local frequency of a portable terminal data feedback channel comprises:
The corresponding relation data of the control information of voltage in the reception base station obtains when the signal that each working channel sends when the mobile terminal configuration portable terminal is static with respect to the base station working channel information, frequency multiplication information and local oscillation circuit frequency reference source;
Portable terminal is finished the adjustment to the local frequency fr of down going channel, be identified for representing the local frequency control parameter of the down going channel of this fr after the adjustment, and search described corresponding relation data according to the work at present channel, obtain the corresponding local frequency control parameter that is used for expression f0, determine ft is adjusted into the local frequency control parameter of the data feedback channel that 2f0-fr need arrange then;
When described portable terminal is adjusted the local frequency ft of data feedback channel, the local frequency that data feedback channel is set according to the requirement that ft is adjusted into 2f0-fr controls parameter, and this local frequency control parameter comprises the frequency multiplication value of control voltage and the local oscillation circuit in local oscillation circuit frequency reference source; Wherein, f0 is the carrier frequency of base station when the signal of work at present channel transmission does not have frequency deviation, and the local frequency that adopts when receiving this signal when static with respect to the base station with portable terminal control parameter is represented.
2. the method for adjustment of local frequency as claimed in claim 1 is characterized in that:
When described portable terminal carries out the local frequency adjustment of down going channel, determine the current control information of voltage Vc that outputs to the local oscillation circuit frequency reference source of down going channel
nReception frequency multiplication value R with local oscillation circuit
r, and according to work at present channel and described control information of voltage Vc
nSearch described corresponding relation data, obtain corresponding frequency multiplication value R
N., m
Described portable terminal carries out the local frequency adjustment of data feedback channel, adopts the control voltage in the local oscillation circuit frequency reference source identical with down going channel, and the frequency multiplication value of described local oscillation circuit data feedback channel is set to R
t, R
t=2R
N., m-R
r
3. the method for adjustment of local frequency as claimed in claim 1 or 2 is characterized in that:
Working channel information in the described corresponding relation data represents that with the wireless communication Taoist monastic name control information of voltage is to represent with control magnitude of voltage or its index in local oscillation circuit frequency reference source, and frequency multiplication information is to represent with the frequency multiplication value of local oscillation circuit.
4. the method for adjustment of local frequency as claimed in claim 1 or 2 is characterized in that:
The local oscillation circuit frequency reference source of described portable terminal has a plurality of operating temperature ranges, in described portable terminal, at each operating temperature range in local oscillation circuit frequency reference source, disposed one group of corresponding relation data that in this operating temperature range, detect the control information of voltage in the working channel information, frequency multiplication information and the local oscillation circuit frequency reference source that obtain respectively;
Described portable terminal was earlier selected one group of corresponding relation data will using according to the working temperature in the local oscillation circuit frequency reference source of detecting in real time before searching described corresponding relation data.
5. the method for adjustment of local frequency as claimed in claim 1 is characterized in that:
Described corresponding relation data are to obtain in the process that described portable terminal or portable terminal of the same type are calibrated, particularly, in this calibration process, portable terminal remains static with respect to the base station, the base station sends signal to described portable terminal on each working channel, described portable terminal carries out channel estimating and finishes local frequency adjustment to the local oscillation circuit down going channel, for each working channel, record the frequency multiplication value of the down going channel that described portable terminal obtains under different control voltage, namely obtain described corresponding relation data.
6. a portable terminal comprises local oscillation circuit and frequency reference source thereof, memory module, descending adjusting module, searches module and up adjusting module, it is characterized in that:
Described local oscillation circuit and frequency reference source thereof, be used for according to the control voltage in the local oscillation circuit frequency reference source of down going channel and receive the local oscillation signal that the frequency multiplication value produces down going channel, according to the control voltage in the local oscillation circuit frequency reference source of data feedback channel with receive the local oscillation signal that the frequency multiplication value produces data feedback channel;
Described memory module, the corresponding relation data of the control information of voltage in the reception base station obtains when the signal that each working channel sends when static with respect to the base station for the preservation portable terminal working channel information, frequency multiplication information and local oscillation circuit frequency reference source;
Described descending adjusting module be used for to be adjusted the control voltage in local oscillation circuit frequency reference source and the reception frequency multiplication value of local oscillation circuit, and the local frequency fr of down going channel is adjusted on the carrier frequency that receives signal;
The described module of searching for the described corresponding relation data of searching memory module according to the work at present channel, obtains corresponding local frequency control parameter and outputs to up adjusting module;
Described up adjusting module, be used for when the local frequency ft to the data feedback channel local oscillation circuit adjusts, the control voltage in local oscillation circuit frequency reference source of data feedback channel and the frequency multiplication value of local oscillation signal are set according to the requirement that ft is adjusted into 2f0-fr, wherein, f0 is the carrier frequency of base station when the signal of work at present channel transmission does not have frequency deviation, and the local frequency that adopts when receiving this signal when static with respect to the base station with the portable terminal of preserving in described memory module control parameter is represented.
7. portable terminal as claimed in claim 6 is characterized in that,
When described descending adjusting module carries out the local frequency adjustment of down going channel, determine the current control voltage Vc that outputs to the local oscillation circuit frequency reference source of down going channel
nReception frequency multiplication value R with local oscillation circuit
r
The described module of searching also is used for working channel information and described control information of voltage Vc according to work at present channel correspondence
nSearch described corresponding relation data and obtain corresponding frequency multiplication value R
N., m, output to up adjusting module;
When the local frequency that described up adjusting module carries out data feedback channel is adjusted, adopt the control voltage in the local oscillation circuit frequency reference source identical with down going channel, the frequency multiplication value of described local oscillation circuit data feedback channel is set to R
t, R
t=2R
N., m-R
r
8. as claim 6 or 7 described portable terminals, it is characterized in that, also comprise temperature sensor, wherein:
Described temperature sensor is used for detecting in real time the current working temperature in local oscillation circuit frequency reference source and outputs to the described module of searching;
The corresponding relation data of preserving in the described memory module have many groups, correspond respectively to an operating temperature range in local oscillation circuit frequency reference source;
The described module of searching was chosen the corresponding relation data that will use according to the working temperature in the local oscillation circuit frequency reference source of detecting in real time earlier before searching described corresponding relation data.
9. as claim 6 or 7 described portable terminals, it is characterized in that, also comprise channel estimation module and calibration module, wherein:
Described calibration module, be used for the process of calibrating to described portable terminal or portable terminal of the same type, when portable terminal remains static with respect to the base station, receive the signal that the base station sends at each working channel, with the certainly collaborative local frequency adjustment of finishing the local oscillation circuit down going channel of channel estimating mould, for each working channel, record the frequency multiplication value of the down going channel that described portable terminal obtains under different control voltage, obtain described corresponding relation data.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910129178.5A CN101567705B (en) | 2009-03-31 | 2009-03-31 | Mobile terminal and uplink channel local frequency regulation method |
| PCT/CN2009/074772 WO2010111863A1 (en) | 2009-03-31 | 2009-11-03 | Mobile terminal and adjusting method for local oscillating frequency of its uplink path |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910129178.5A CN101567705B (en) | 2009-03-31 | 2009-03-31 | Mobile terminal and uplink channel local frequency regulation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101567705A CN101567705A (en) | 2009-10-28 |
| CN101567705B true CN101567705B (en) | 2013-08-07 |
Family
ID=41283692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910129178.5A Expired - Fee Related CN101567705B (en) | 2009-03-31 | 2009-03-31 | Mobile terminal and uplink channel local frequency regulation method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101567705B (en) |
| WO (1) | WO2010111863A1 (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101567705B (en) * | 2009-03-31 | 2013-08-07 | 中兴通讯股份有限公司 | Mobile terminal and uplink channel local frequency regulation method |
| CN102404839A (en) * | 2010-09-08 | 2012-04-04 | 鼎桥通信技术有限公司 | Synchronous locking method and wireless telecommunication device |
| CN103428138A (en) * | 2012-05-15 | 2013-12-04 | 中国普天信息产业股份有限公司 | Doppler precompensation method aiming at uplink channel |
| CN104254997B (en) * | 2013-08-27 | 2017-06-06 | 华为终端有限公司 | The transmission method and base station, user equipment of a kind of machine type communication downlink data |
| CN103684484B (en) * | 2013-12-23 | 2015-08-26 | 联想(北京)有限公司 | A kind of signal transmitting method, a kind of transmitter and a kind of electronic equipment |
| CN104320203B (en) * | 2014-03-24 | 2017-04-12 | 上海巨微集成电路有限公司 | Wireless frequency calibration device and method |
| CN110476393B (en) * | 2017-06-19 | 2021-05-14 | 华为技术有限公司 | Uplink optical signal modulation method, optical communication node and system |
| CN107359883B (en) * | 2017-08-08 | 2022-11-18 | 歌尔股份有限公司 | Radio frequency transmitting and receiving device, transmitting and receiving system, unmanned aerial vehicle and unmanned aerial vehicle system |
| CN108123763A (en) * | 2017-12-26 | 2018-06-05 | 中国铁路信息技术中心 | Frequency difference compensation method and device |
| CN108377543B (en) * | 2018-01-09 | 2021-01-08 | 北京智联安科技有限公司 | NBIoT terminal clock synchronization method and device |
| CN108770020B (en) * | 2018-05-22 | 2022-09-30 | Oppo广东移动通信有限公司 | Electronic device, control method thereof, and computer-readable storage medium |
| CN111273709B (en) * | 2018-12-05 | 2021-07-23 | 锐迪科（重庆）微电子科技有限公司 | Temperature control device and method |
| CN110505030B (en) * | 2019-08-14 | 2021-06-11 | 四川安迪科技实业有限公司 | Local oscillation adjusting method and device for satellite network receiving equipment |
| CN112615679B (en) * | 2020-12-31 | 2022-04-15 | 武汉邮电科学研究院有限公司 | Spatial coherent optical communication frequency tracking system and frequency shift tracking compensation method |
| CN112953621B (en) * | 2021-03-10 | 2023-03-07 | 广州海格通信集团股份有限公司 | Satellite navigation communication method and device, beidou user machine and storage medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101252398A (en) * | 2008-04-03 | 2008-08-27 | 北京航空航天大学 | Spread-spectrum signal source with Doppler analogue function |
| CN101378276A (en) * | 2008-09-23 | 2009-03-04 | 林志华 | Method for correcting Doppler frequency difference of high speed moving body |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5633898A (en) * | 1993-12-22 | 1997-05-27 | Matsushita Electric Industrial Co., Ltd. | Automatic frequency control apparatus for FSK receiver and FSK receiver including the same |
| CN2687956Y (en) * | 2004-02-11 | 2005-03-23 | 中国电子科技集团公司第五十四研究所 | Doppler frequency shift correcting device for high speed mobile satellite satellite communication |
| CN101567705B (en) * | 2009-03-31 | 2013-08-07 | 中兴通讯股份有限公司 | Mobile terminal and uplink channel local frequency regulation method |
-
2009
- 2009-03-31 CN CN200910129178.5A patent/CN101567705B/en not_active Expired - Fee Related
- 2009-11-03 WO PCT/CN2009/074772 patent/WO2010111863A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101252398A (en) * | 2008-04-03 | 2008-08-27 | 北京航空航天大学 | Spread-spectrum signal source with Doppler analogue function |
| CN101378276A (en) * | 2008-09-23 | 2009-03-04 | 林志华 | Method for correcting Doppler frequency difference of high speed moving body |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101567705A (en) | 2009-10-28 |
| WO2010111863A1 (en) | 2010-10-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101567705B (en) | Mobile terminal and uplink channel local frequency regulation method | |
| CN102196468B (en) | Communication method and communication system | |
| EP2154802A1 (en) | Calibration method, communication system, frequency control method, and communication device | |
| US8649752B2 (en) | Method and system for reducing the complexity of multi-frequency hypothesis testing using an iterative approach | |
| CN102739268A (en) | Transceiver and compensating method | |
| US8630598B2 (en) | Methods and apparatus for measuring and/or using transmitter and/or receiver IQ imbalance information and/or DC offset information | |
| US20110170527A1 (en) | Base station device | |
| CN102027674B (en) | Technique for controlling a gain of a receiver | |
| US9306680B2 (en) | Method and device for calibrating frequency synthesizer in communication terminal | |
| CN105850063A (en) | Transmitter (tx) residual sideband (rsb) and local oscillator (lo) leakage calibration using a reconfigurable tone generator (tg) and lo paths | |
| US20100216407A1 (en) | Systems and methods for dynamic temperature calibration of a frequency reference | |
| US20150172087A1 (en) | Methods for communication apparatus to align a frame boundary with a cell and communication apparatus utilizing the same | |
| CN104683039B (en) | The crystal oscillator frequency calibration method and calibrating installation of communication terminal | |
| CN115913441B (en) | Clock frequency offset joint estimation method and initial frequency offset calibration method for multimode communication module | |
| CN108605304A (en) | Using the downlink transmission time tracking in the NB-IoT devices of the sample rate of reduction | |
| CN101500248B (en) | Antenna calibration method and apparatus | |
| USRE49805E1 (en) | Apparatus and circuit for processing carrier aggregation | |
| EP2401877A2 (en) | Base station reference frequency correction and timing correction using transceiver feedback | |
| CN102318196B (en) | Frequency correction circuit, frequency correction method, and wireless communication apparatus using same | |
| US7646803B2 (en) | Apparatus and method for estimating and combining frequency errors in a mobile communication system | |
| EP1865599B1 (en) | Portable radio terminal and AFC control method | |
| CN102651672B (en) | Base station calibration method and device for cooperative multiple input multiple output (MIMO) system | |
| CN103857039A (en) | Device and method in wireless communication system | |
| CN105376045A (en) | Radio-frequency chip capable of correcting Doppler frequency shift and mobile terminal | |
| KR100923178B1 (en) | System and method for compensating delay of output signal passed through mimo path within wibro base station |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20161219 Address after: 350600 Luoyuan, Fuzhou Province, nine central building, floor, floor, No. 2, Patentee after: LUOYUAN COUNTY PRODUCTIVITY PROMOTION CENTER Address before: 518057 Nanshan District high tech Industrial Park, Guangdong, South Road, science and technology, ZTE building, legal department Patentee before: ZTE Corp. |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201021 Address after: 6 / F, No.1, Dongwai Road, Fengshan Town, Luoyuan County, Fuzhou City, Fujian Province Patentee after: Luoyuan product quality inspection institute Address before: First floor, building 2, Jiuda center, Luoyuan County Patentee before: LUOYUAN COUNTY PRODUCTIVITY PROMOTION CENTER |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130807 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |