CN101374036A - Transmission diversity method and system for multi-input multi-output OFDM system - Google Patents

Transmission diversity method and system for multi-input multi-output OFDM system Download PDF

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CN101374036A
CN101374036A CNA2007101451605A CN200710145160A CN101374036A CN 101374036 A CN101374036 A CN 101374036A CN A2007101451605 A CNA2007101451605 A CN A2007101451605A CN 200710145160 A CN200710145160 A CN 200710145160A CN 101374036 A CN101374036 A CN 101374036A
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data flow
ofdm
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李斌
秦洪峰
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ZTE Corp
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Abstract

The invention discloses a transmit diversity method in a multiple-input multiple-output orthogonal frequency division multiplexing (MIMO OFDM) system, and a system thereof. The method comprises the steps of performing channel encoding and modulation of original information bits, and performing space frequency block coding (SFBC) mapping of two antennae to obtain two paths of encoded sub-data streams; and inserting pilot signals in the two paths of encoded sub-data streams, performing OFDM modulation to obtain OFDM symbol data streams, and transmitting each OFDM symbol data stream after antenna selection. By using the inventive method and system, the MIMO OFDM communication system has improved performance by using space diversity technology without losing the transmission rate; and multiple antennae can share one set of radio-frequency unit during specific applications, thereby effectively reducing system cost and power consumption.

Description

The emission diversity method of multi-input multi-output-orthogonal frequency-division multiplexing system and system
Technical field
The present invention relates to wireless communication system, more specifically relate to transmit diversity (Transmit Diversity) method and system of a kind of multiple-input, multiple-output (MIMO), OFDM (OFDM) wireless communication system.
Background technology
Development along with Digital Signal Processing and high speed device, the initial obstacle of OFDM technology of realizing has not existed, and OFDM has obtained successful application in DAB (digital audio broadcasting), DVB (digital video broadcasting) and WLAN systems such as (WLAN (wireless local area network)).OFDM utilizes the orthogonality between each subcarrier, allows the frequency spectrum of subchannel overlapped, can utilize frequency spectrum resource largely.It passes through string and conversion to high-speed data-flow, make the data symbol persistence length on each subcarrier increase relatively, thereby reduced the intersymbol interference that temporal dispersion brought (ISI) of wireless channel effectively, simultaneously because the bandwidth relative narrower of each subchannel, equilibrium just can be carried out respectively each subcarrier, has so just reduced complexity balanced in the receiver.Because These characteristics, this technology is widely used in recent years.
In the communication system in future, the feasible demand to frequency spectrum of the surge of high speed business and number of users sharply increases, and frequency spectrum resource is limited, so technology in conjunction with MIMO and these two advanced persons of OFDM, the availability of frequency spectrum can be improved on the one hand, frequency selective fading can be effectively resisted on the other hand.
MIMO is meant and uses a plurality of transmitting antennas and reception antenna respectively at transmitting terminal and receiving terminal.The basic thought of MIMO is in emission, receives or the transmitting-receiving both-end adopts a plurality of antennas, and treatment technology during by sky makes full use of the independent fading characteristic of interchannel, improves the availability of frequency spectrum, communication quality and power system capacity.
The MIMO technology comprises two kinds of diversity and spatial reuses, wherein space multiplexing technique is mainly utilized the degree of freedom by the mimo system that multipath transmisstion brought of wireless channel, if each is separate to the decline in dual-mode antenna path, then can utilize these parallel channels to transmit independently information flow, thereby improve the data transmission rate of system.BLAST scheme etc. for example.Yet simple spatial multiplex scheme is not an optimal case.Because the degree of freedom of mimo system is limited under given antenna configurations, schemes such as BLAST are had relatively high expectations for the independence of channel, and its systematic function is relatively poor in the lower channel circumstance of independence.
Diversity technique during mainly with sky (frequently empty) code diversity be representative, it mainly utilizes Space Time Coding and increases the redundant information of transmission, thereby improves the stability of wireless transmission.Its hollow is block code (SpaceFrequency Block Coding frequently, SFBC) than the space-time block code that can only under the low speed fading environment, could guarantee its performance (Space Time Block Coding, STBC) more sane in fading environment, and this multi-transceiver technology that is applied to adjacent sub-channel or adjacent carrier of SFBC is more suitable for being applied in this multicarrier modulation system of OFDM.But, by 4 or more need 2N subcarrier for N code element during the emission complex symbol of transmitting antenna, thereby cause the reduction of data transfer rate with to adopt two transmit antennas to obtain the situation of diversity gain on the basis of not sacrificing data transfer rate different.In order in the MIMO+OFDM system that sends signal by three or more transmitting antennas, to realize the full rate emission, therefore must consider other emission diversity scheme.
In sum, the technical scheme of the transmit diversity of a kind of multi-input multi-output-orthogonal frequency-division multiplexing wireless communication system that can guarantee message transmission rate and diversity gain simultaneously of current needs.
Summary of the invention
Technical problem to be solved by this invention provides a kind of emission diversity method and system of multi-input multi-output-orthogonal frequency-division multiplexing system, the emission diversity scheme that promptly provides the SFBC that comprises in a kind of MIMO+OFDM communication system under open loop and the closed-loop case to combine with day line options, thereby make the MIMO+OFDM communication system under many antennas situation, can guarantee full rate emission data, and guarantee corresponding diversity gain.
In order to address the above problem, the invention provides a kind of emission diversity method of multi-input multi-output-orthogonal frequency-division multiplexing system, may further comprise the steps,
A, original information bits carried out chnnel coding and modulation after, carry out the empty coding of the block code frequently mapping of two antennas, obtain sub data flow after the two-way numeralization;
B, after the two-way numeralization, insert pilot signal in the sub data flow after, carry out the OFDM modulation and obtain the OFDM symbol data flow, every road OFDM symbol data flow of gained is carried out a day line options emission.
Further, said method also can comprise, among the described step a, described original information bits carried out chnnel coding and modulation, may further comprise the steps,
Data stream is carried out chnnel coding, obtain encoded data stream;
Described encoded data stream is carried out channel interleaving, obtain interleaved data stream;
Described interleaved data stream is carried out planisphere mapping, obtain data flow after the coded modulation.
Further, said method can comprise that also described chnnel coding is code check convolutional encoding, Turbo coding or low density parity check code coding.
Further, said method can comprise that also among the described step a, described number of transmit antennas is more than or equal to 2.
Further, said method also can comprise, among the described step b, sub data flow after the every road numeralization after the insertion pilot signal is carried out the OFDM modulation respectively, may further comprise the steps,
Carry out serial to parallel conversion, sub data flow obtains N after the numeralization of every road FFTIndividual parallel low speed sub data flow, wherein N FFTNumber for OFDM modulation sub-carriers;
The low speed sub data flow is carried out inverse fast fourier transform, obtain the OFDM symbol data flow;
The OFDM symbol data flow is added Cyclic Prefix, finish the OFDM modulated process.
Further, said method also can comprise, among the described step b, under open loop case, every road OFDM symbol data flow of gained is carried out alternately emission of antenna; Every road OFDM symbol data flow to gained under closed-loop case is carried out a day line options emission according to channel feedback information by Antenna Selection Algorithem.
Further, said method can comprise that also described Antenna Selection Algorithem comprises the Antenna Selection Algorithem of receiver Signal to Interference plus Noise Ratio maximum and/or channel capacity maximum and/or channel quality optimum.
The present invention also provides a kind of transmit diversity systems of multi-input multi-output-orthogonal frequency-division multiplexing system, comprises that coded modulation unit, empty block code coding unit frequently, insertion pilot tone become frame unit, OFDM modulating unit, antenna selected cell, wherein,
The coded modulation unit is used for original information bits is carried out chnnel coding and modulation, obtains data flow after the coded modulation, is transferred to empty block code coding unit frequently;
Empty block code coding unit frequently is used for data flow after the coded modulation of coded modulation unit transmission is carried out the empty coding of the block code frequently mapping of two antennas, obtains sub data flow after the two-way numeralization, is transferred to insert pilot tone and become frame unit;
Insert pilot tone and become frame unit, be used for sub data flow after every road numeralization of sky block code coding unit transmission is frequently inserted pilot signal, be transferred to OFDM modulate emission unit;
OFDM modulate emission unit, be used for that sub data flow carries out the OFDM modulation after the numeralization of every road to inserting after the insertion pilot signal that pilot tone becomes the frame unit transmission, obtain OFDM modulation symbol data stream, be transferred to a day line options transmitter unit;
It line options transmitter unit is used for every road OFDM symbol data flow of OFDM modulate emission unit transmission is carried out a day line options emission.
Further, said system can comprise that also described coded modulation unit at first carries out chnnel coding to original information bits, obtains encoded data stream; Again encoded data stream is carried out channel interleaving and obtain interleaved data stream; Then interleaved data stream is carried out constellation mapping, obtain data flow after the coded modulation.
Further, said system also can comprise, sub data flow carries out serial to parallel conversion, inverse fast fourier transform successively independently and adds Cyclic Prefix after the numeralization of every road to inserting after the pilot signal in described OFDM modulate emission unit, obtain OFDM modulation symbol data stream, be transferred to a day line options transmitter unit.
Further, said system can comprise that also the line options transmitter unit carried out a day line options emission according to channel feedback information by Antenna Selection Algorithem under closed-loop case in described day; The line options transmitter unit carried out alternately emission of antenna under open loop case in described day.
Further, said system can comprise that also described Antenna Selection Algorithem comprises the Antenna Selection Algorithem of receiver Signal to Interference plus Noise Ratio maximum and/or channel capacity maximum and/or channel quality optimum.
Further, said system also can comprise, under closed-loop case, comprises the feedback information unit, is used for providing for described antenna selected cell according to the feedback information of receiving terminal at frequency division duplex system the information of radio spatial channels; Or in tdd systems, provide the information of radio spatial channels for the antenna selected cell according to the good symmetry of up-downgoing interchannel.
Compared with prior art, the present invention is by at first carrying out the SFBC coding to original information bits, and then utilize channel or temporal information to select antenna to transmit, thereby make the MIMO+OFDM communication system on the basis that guarantees system transmissions speed, to utilize space diversity reception to communicate to improve the performance of system; And adopt many antenna duplexers one cover radio frequency unit in the time of can specifically using, effectively reduce system cost and power consumption.
Description of drawings
Fig. 1 is the emission diversity method flow chart of a kind of multi-input multi-output-orthogonal frequency-division multiplexing system in the specific embodiment of the invention;
Fig. 2 is the theory diagram of the diversity emission of multi-input multi-output-orthogonal frequency-division multiplexing system in the specific embodiment of the invention;
Fig. 3 is the transmit diversity systems block diagram of emission diversity method under the open loop mode under the situation of number of antennas N=4 in the specific embodiment of the invention;
Fig. 4 is the transmit diversity systems block diagram of emission diversity method under the closed loop mode under the situation of number of antennas N=4 in the specific embodiment of the invention;
Fig. 5 is the flow chart that system launches from coded modulation to the sky line options in the specific embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the invention is described further.
Main design of the present invention is, to the original information bits coded modulation; The SFBC coding that data after modulating is carried out two antennas is divided into two data flow; Insert frequency pilot sign in every way data flow; Each data flow is carried out the OFDM modulation; Every road OFDM symbols streams to gained is carried out day line options or is replaced emission according to the different time antenna according to channel feedback information.
As shown in Figure 1, a kind of emission diversity method of multi-input multi-output-orthogonal frequency-division multiplexing wireless communication system comprises the steps,
Step 110, armed original information bits is carried out chnnel coding and modulation, obtain data flow after the coded modulation;
This process comprises following 3 steps:
Figure A200710145160D00101
Data stream is carried out chnnel coding, obtain encoded data stream;
Chnnel coding can comprise various code check convolutional encodings, Turbo coding, LDPC (low density parity check code) coding etc. any one or multiple arbitrarily.
Described encoded data stream is carried out channel interleaving, obtain interleaved data stream;
Figure A200710145160D00103
Described interleaved data stream is carried out planisphere mapping, obtain data flow after the coded modulation.
Step 120, data flow after the resulting coded modulation is carried out the SFBC coding mapping of two antennas, obtain sub data flow s after the two-way numeralization 1And s 2, wherein require number of transmit antennas N 〉=2;
Mapping matrix is as follows:
S = s 1 - s 2 * s 2 s 1 *
S wherein 1, s 2Data symbol on the different frequency to be launched after the expression modulation, [] *Matrix transpose operation is gripped in expression altogether, then is respectively through two data flow sub data flow after the two-way numeralization of launching on the different frequencies after the coding s 1 = { s 1 , - s 2 * } With s 2={ s 2, s 1.
Step 130, after the two-way numeralization that obtains, insert pilot signal respectively in the sub data flow;
Step 140, sub data flow after inserting the every road numeralization after the pilot signal is carried out the OFDM modulation respectively, obtain the OFDM symbol data streams;
This process comprises following 3 steps:
Carry out serial to parallel conversion, sub data flow obtains N after each numeralization FFTIndividual parallel low speed sub data flow, wherein N FFTNumber for OFDM modulation sub-carriers;
The low speed sub data flow is carried out IFFT conversion (inverse fast fourier transform), obtain the OFDM symbol data streams;
The OFDM symbol data streams is added cyclic prefix CP, finish the OFDM modulated process.
Step 150, every road OFDM symbol data streams of gained is carried out the emission of day line options.
Wherein under open loop case, carry out alternately emission of antenna; Under closed-loop case, carry out a day line options emission according to channel feedback information.
Under open loop case, in 2 transmit antennas of each sub data flow correspondence, select alternately emission successively; And under closed-loop case, channel information according to feedback utilizes Antenna Selection Algorithem to select emission in 2 transmit antennas of each sub data flow correspondence, and concrete algorithm comprises that with receiver Signal to Interference plus Noise Ratio maximum and/or channel capacity maximum and/or channel quality optimum be Antenna Selection Algorithem such as selection principle.
Fig. 2 is the theory diagram of the diversity emission of multi-input multi-output-orthogonal frequency-division multiplexing system in the specific embodiment of the invention, in order to realize this diversity transmission schemes, the diversity emission system of a kind of multiple-input, multiple-output, ofdm system is provided in the specific embodiment of the invention, system comprises that coded modulation unit 1, SFBC coding unit 2, insertion pilot tone become frame unit 3, OFDM modulating unit 4, antenna selected cell 5, and the feedback information unit 6 that only under closed-loop case, exists, wherein
Coded modulation unit 1 is used for original information bits is carried out chnnel coding successively independently, interweaved and modulation treatment, obtains data flow after the coded modulation, is transferred to SFBC coding unit 2;
In the specific embodiment of the present invention, coded modulation unit 1 at first carries out chnnel coding to original information bits b, and chnnel coding can comprise various code check convolutional encodings, Turbo coding or LDPC coding etc., obtains encoded data stream d; Again encoded data stream d is carried out channel interleaving and obtain interleaved data stream e; Then interleaved data stream e is carried out constellation mapping, obtain data flow s after the coded modulation.
SFBC coding unit 2 is used for data flow after the coded modulation of coded modulation unit 1 transmission is carried out the SFBC coding mapping of two antennas, obtains sub data flow s after the two-way numeralization 1And s 2, be transferred to the insertion pilot tone and become frame unit 3, wherein require number of transmit antennas N 〉=2;
The mapping matrix of two antenna SFBC coding is as follows:
S = s 1 - s 2 * s 2 s 1 *
S wherein 1, s 2Data symbol on the different frequency to be launched after the expression modulation, [] *Matrix transpose operation is gripped in expression altogether.Then be respectively through two data flow sub data flow after the two-way numeralization of launching on the different frequencies after the coding s 1 = { s 1 , - s 2 * } With s 2={ s 2, s 1.
Insert pilot tone and become frame unit 3, be used for sub data flow s after every road numeralization of SFBC coding unit 2 transmission 1And s 2The middle pilot signal of inserting is transferred to OFDM modulate emission unit 4;
In the specific embodiment of the present invention, MUX unit 3 becomes frame unit for promptly inserting pilot tone; The pilot signal of each data flow is distinguished with mutual position difference.
OFDM modulate emission unit 4 is used for inserting after the insertion pilot signal that pilot tone becomes frame unit 3 transmission sub data flow S after the numeralization of every road 1And S 2Carry out the OFDM modulation successively independently, the OFDM modulation comprises serial to parallel conversion S/P, IFFT conversion and adds cyclic prefix CP that sub data flow obtains OFDM modulation symbol data stream X after the numeralization of then every road m=IFFT (S m), be transferred to a day line options transmitter unit 5;
It line options transmitter unit 5 is used for every road OFDM symbol data streams of OFDM modulate emission unit 4 transmission is carried out a day line options emission; Wherein under closed-loop case, carry out a day line options emission by Antenna Selection Algorithem according to channel feedback information; Under open loop case, carry out alternately emission of antenna (wheel is sent out);
Antenna Selection Algorithem comprises that with receiver Signal to Interference plus Noise Ratio maximum and/or channel capacity maximum and/or channel quality optimum be Antenna Selection Algorithem such as selection principle.
Feedback information unit 6, this unit only exists under closed loop mode, is used in FDD (Frequency Division Duplexing (FDD)) system according to the feedback information of receiving terminal or the information of radio spatial channels is provided for antenna selected cell 5 according to the good symmetry of up-downgoing interchannel in TDD (time division duplex) system.
Fig. 3 and Fig. 4 have described the system block diagram of a kind of instantiation of emission diversity method under the situation of number of antennas N=4 in the specific embodiment of the invention, and wherein Fig. 3 is the transmit diversity systems block diagram under the open loop mode; Fig. 4 is the transmit diversity systems block diagram under the closed loop mode.
In this example, number of antennas is divided into two groups, number after the coded modulation is carried out the SFBC coding of 2 antennas, thereby obtain 2 groups of sub data flows, after it is inserted pilot tone and OFDM modulation operations respectively, under open loop case, in 2 transmit antennas of each sub data flow correspondence, select alternately emission successively; And under closed-loop case, channel information according to feedback utilizes Antenna Selection Algorithem to select emission in 2 transmit antennas of each sub data flow correspondence, and concrete algorithm comprises that with receiver Signal to Interference plus Noise Ratio maximum, channel capacity maximum and channel quality optimum be Antenna Selection Algorithem such as selection principle.
The invention will be further described below in conjunction with instantiation.
Fig. 5 has described method flow of the present invention, and it has comprised the whole flow process that system launches from coded modulation to the sky line options, and is specific as follows:
In the step 501, original information bits is carried out modulating-coding; Data for original information bits are carried out chnnel coding successively, are interweaved and modulation treatment, thereby obtain data flow s after the coded modulation.
In the step 502, data flow after the resulting coded modulation is carried out the SFBC coding mapping of many antennas, obtain sub data flow s after the two-way numeralization 1And s 2, wherein require number of transmit antennas N 〉=2.
In the step 503, after the two-way numeralization, insert pilot signal p in the sub data flow respectively 1And p 2Signal S after the formation framing 1And S 2The pilot signal of each data flow is distinguished with mutual position difference.
In the step 504, sub data flow after the numeralization after every road insertion pilot signal is carried out the OFDM modulation; For S 1And S 2Carry out serial to parallel conversion S/P, IFFT conversion successively independently and add the cyclic prefix CP step, obtain OFDM modulation symbol data stream x 1And x 2, wherein X m = IFFT ( S m ) = 1 N FFT Σ i = 1 N FFT S m e j 2 πft .
In the step 505, every road OFDM symbol data streams of gained is carried out the emission of day line options, promptly from the N transmit antennas, select wherein 2 to launch.
Wherein under closed-loop case, carry out a day line options emission according to channel feedback information; Under open loop case, carry out alternately emission of antenna.
In a word, the diversity transmitting method of a kind of radio MIMO disclosed in this invention+OFDM wireless communication system, comprising open loop and two kinds of situations of closed loop, compare with existent method, emission diversity method of the present invention is after obtaining the multichannel sub data flow behind the SFBC coding, under closed loop mode, carry out many sky line options emissions or under open loop mode, utilize temporal information to carry out alternately emission of antenna according to channel information, performance with this further raising system on the basis that guarantees transmission rate, and adopt many antenna duplexers one cover radio frequency unit in the time of can specifically using, effectively reduce system cost and power consumption, be beneficial to very much Project Realization.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; 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 claim.

Claims (13)

1. the emission diversity method of a multi-input multi-output-orthogonal frequency-division multiplexing system may further comprise the steps,
A, original information bits carried out chnnel coding and modulation after, carry out the empty coding of the block code frequently mapping of two antennas, obtain sub data flow after the two-way numeralization;
B, after the two-way numeralization, insert pilot signal in the sub data flow after, carry out the OFDM modulation and obtain the OFDM symbol data flow, every road OFDM symbol data flow of gained is carried out a day line options emission.
2. the method for claim 1 is characterized in that, among the described step a, described original information bits is carried out chnnel coding and modulation, may further comprise the steps,
Data stream is carried out chnnel coding, obtain encoded data stream;
Described encoded data stream is carried out channel interleaving, obtain interleaved data stream;
Described interleaved data stream is carried out planisphere mapping, obtain data flow after the coded modulation.
3. method as claimed in claim 2 is characterized in that, described chnnel coding is code check convolutional encoding, Turbo coding or low density parity check code coding.
4. the method for claim 1 is characterized in that, among the described step a, described number of transmit antennas is more than or equal to 2.
5. the method for claim 1 is characterized in that, among the described step b, sub data flow after the every road numeralization after the insertion pilot signal is carried out the OFDM modulation respectively, may further comprise the steps,
Carry out serial to parallel conversion, sub data flow obtains N after the numeralization of every road FFTIndividual parallel low speed sub data flow, wherein N FFTNumber for OFDM modulation sub-carriers;
The low speed sub data flow is carried out inverse fast fourier transform, obtain the OFDM symbol data flow;
The OFDM symbol data flow is added Cyclic Prefix, finish the OFDM modulated process.
6. the method for claim 1 is characterized in that, among the described step b, under open loop case, every road OFDM symbol data flow of gained is carried out alternately emission of antenna; Every road OFDM symbol data flow to gained under closed-loop case is carried out a day line options emission according to channel feedback information by Antenna Selection Algorithem.
7. method as claimed in claim 6 is characterized in that, described Antenna Selection Algorithem comprises the Antenna Selection Algorithem of receiver Signal to Interference plus Noise Ratio maximum and/or channel capacity maximum and/or channel quality optimum.
8. the transmit diversity systems of a multi-input multi-output-orthogonal frequency-division multiplexing system is characterized in that, comprises that coded modulation unit, empty block code coding unit frequently, insertion pilot tone become frame unit, OFDM modulating unit, antenna selected cell, wherein,
The coded modulation unit is used for original information bits is carried out chnnel coding and modulation, obtains data flow after the coded modulation, is transferred to empty block code coding unit frequently;
Empty block code coding unit frequently is used for data flow after the coded modulation of coded modulation unit transmission is carried out the empty coding of the block code frequently mapping of two antennas, obtains sub data flow after the two-way numeralization, is transferred to insert pilot tone and become frame unit;
Insert pilot tone and become frame unit, be used for sub data flow after every road numeralization of sky block code coding unit transmission is frequently inserted pilot signal, be transferred to OFDM modulate emission unit;
OFDM modulate emission unit, be used for that sub data flow carries out the OFDM modulation after the numeralization of every road to inserting after the insertion pilot signal that pilot tone becomes the frame unit transmission, obtain OFDM modulation symbol data stream, be transferred to a day line options transmitter unit;
It line options transmitter unit is used for every road OFDM symbol data flow of OFDM modulate emission unit transmission is carried out a day line options emission.
9. system as claimed in claim 8 is characterized in that, described coded modulation unit at first carries out chnnel coding to original information bits, obtains encoded data stream; Again encoded data stream is carried out channel interleaving and obtain interleaved data stream; Then interleaved data stream is carried out constellation mapping, obtain data flow after the coded modulation.
10. system as claimed in claim 8, it is characterized in that, sub data flow carries out serial to parallel conversion, inverse fast fourier transform successively independently and adds Cyclic Prefix after the numeralization of every road to inserting after the pilot signal in described OFDM modulate emission unit, obtain OFDM modulation symbol data stream, be transferred to a day line options transmitter unit.
11. system as claimed in claim 8 is characterized in that, the line options transmitter unit carried out a day line options emission according to channel feedback information by Antenna Selection Algorithem under closed-loop case in described day; The line options transmitter unit carried out alternately emission of antenna under open loop case in described day.
12. system as claimed in claim 11 is characterized in that, described Antenna Selection Algorithem comprises the Antenna Selection Algorithem of receiver Signal to Interference plus Noise Ratio maximum and/or channel capacity maximum and/or channel quality optimum.
13. system as claimed in claim 11 is characterized in that, under closed-loop case, comprises the feedback information unit, is used for providing for described antenna selected cell according to the feedback information of receiving terminal at frequency division duplex system the information of radio spatial channels; Or in tdd systems, provide the information of radio spatial channels for the antenna selected cell according to the good symmetry of up-downgoing interchannel.
CNA2007101451605A 2007-08-23 2007-08-23 Transmission diversity method and system for multi-input multi-output OFDM system Pending CN101374036A (en)

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CN101938777A (en) * 2009-06-30 2011-01-05 中兴通讯股份有限公司 Special reference signal mapping method and device for downlink terminal in LET (Long Term Evolution) system
CN102034480A (en) * 2010-12-16 2011-04-27 厦门大学 Communication method of underwater digital voice
CN102355332A (en) * 2011-10-10 2012-02-15 北京工业大学 Multi-antenna signal transmission method
CN104641571A (en) * 2013-04-10 2015-05-20 华为技术有限公司 Method, device, and system for mobile communication
WO2014166180A1 (en) * 2013-04-10 2014-10-16 华为技术有限公司 Method, device, and system for mobile communication
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