CN106941462A - A kind of method and device of signal detection - Google Patents
A kind of method and device of signal detection Download PDFInfo
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- CN106941462A CN106941462A CN201610003701.XA CN201610003701A CN106941462A CN 106941462 A CN106941462 A CN 106941462A CN 201610003701 A CN201610003701 A CN 201610003701A CN 106941462 A CN106941462 A CN 106941462A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
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- H—ELECTRICITY
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Abstract
The invention discloses a kind of method and device of signal detection, it is related to the communications field, methods described includes：Obtain the channel estimation value of all antennas on each frequency pilot sign；Frequency-time domain transformation is carried out by the channel estimation value to all antennas on acquired each frequency pilot sign, time domain channel estimate is obtained；Using all time domain channel estimates, time domain peak search is carried out, the corresponding peak parameters of peak value are obtained；According to the peak parameters, to transmitting terminal, whether sending signal is detected.The present invention can accurately detect signal, realize simply, can reduce the processing delay of system, simplify the flow such as scheduling of resource and power control.
Description
Technical field
The present invention relates to the communications field, more particularly to a kind of method and device of signal detection.
Background technology
With the development of wireless communication technology, people increasingly pay attention to tenability, performance and speed of system etc.
Index.In communication process, by taking base station side as an example, some abnormal conditions often occur, for example, first
The inspection of message (Message, MSG1) void, terminals physical down control channel (Physical Downlink Control
Channel, PDCCH) detection fails or system handles the factors such as time-out and causes terminal not in corresponding time-frequency
Sending signal on the position of domain.In this case, if base station void inspection there is signal, need carry out symbol level and
The processing of bit-level, final CRC (Cyclic Redundancy Check, CRC) result is
Mistake, will necessarily increase the processing delay of system, at the same also can to the high-rise information for providing mistake, cause scheduling and
There are abnormal conditions in power control etc..Similarly, if terminal has sent data, but base station missing inspection, do not detect
Lost to signal, and according to downgoing control signal 0 (Downlink Control Information 0, DCI0)
Lose and handle, will necessarily to system self-adaption modulating-coding (Adaptive Modulation and Coding,
AMC) the processing such as adjustment and power control provides error message, so as to cause AMC and power control etc. exception and flow occur
Tremble the phenomenons such as drop.The detection whether detection or DCI0 therefore, for signal loses is particularly important, and with
Corresponding Testing index, i.e., empty inspection and false dismissal probability, as the key factor for weighing detection performance.
The detection method generally used at present is to use Signal to Interference plus Noise Ratio (Signal to
Interference plus Noise Ratio, SINR) judge, but SINR computational accuracy and channel,
Resource Block (Resource Block, RB) size and signal power power are closely bound up, and the essence of channel estimation
Degree height can also influence SINR calculating.It can be seen that, what whether the signal detection or DCI0 generally used lost
Detection is limited by the influence of the factor such as channel estimation and RB scheduling completely, big for different modulation systems, RB
The factors such as small or antenna, cause decision threshold more, and testing process is complicated, and empty inspection and false dismissal probability are higher.
The content of the invention
It is an object of the invention to provide a kind of method and device of signal detection, existing signal can be preferably solved
The problem of complicated and empty inspection false dismissal probability of detection method testing process is high.
According to an aspect of the invention, there is provided a kind of method of signal detection, including：
Obtain the channel estimation value of all antennas on each frequency pilot sign；
Frequency-time domain transformation is carried out by the channel estimation value to all antennas on acquired each frequency pilot sign, obtained
Time domain channel estimate；
Using all time domain channel estimates, time domain peak search is carried out, the corresponding peak parameters of peak value are obtained；
According to the peak parameters, to transmitting terminal, whether sending signal is detected.
Preferably, the frequency-time domain transformation includes one of following processing：
Not divided antenna and regardless of the frequency-time domain transformation of frequency pilot sign；
Divided antenna and regardless of the frequency-time domain transformation of frequency pilot sign；
The not frequency-time domain transformation of divided antenna and point frequency pilot sign；
The frequency-time domain transformation of divided antenna and point frequency pilot sign.
Preferably, the not divided antenna and frequency-time domain transformation regardless of frequency pilot sign includes：
The channel estimation value of all antennas on acquired each frequency pilot sign is overlapped, not divided antenna is obtained
And regardless of the channel estimation value of frequency pilot sign；
Carried out to the not divided antenna and regardless of the channel estimation value of frequency pilot sign at the conversion of frequency domain to time domain
Reason, obtains not divided antenna and regardless of the time domain channel estimate of frequency pilot sign.
Preferably, the divided antenna and frequency-time domain transformation regardless of frequency pilot sign includes：
Channel estimation value on all frequency pilot signs corresponding to every antenna is overlapped, obtain divided antenna and
Regardless of the channel estimation value of frequency pilot sign；
Carried out to the divided antenna and regardless of the channel estimation value of frequency pilot sign from the conversion process of frequency domain to time domain,
Obtain divided antenna and regardless of the time domain channel estimate of frequency pilot sign.
Preferably, the frequency-time domain transformation of the not divided antenna and point frequency pilot sign includes：
The channel estimation value of all antennas corresponding to each frequency pilot sign is overlapped, obtain not divided antenna and
Divide the channel estimation value of frequency pilot sign；
The conversion process from frequency domain to time domain is carried out to the channel estimation value of the not divided antenna and point frequency pilot sign,
Obtain the time domain channel estimate of not divided antenna and point frequency pilot sign.
Preferably, the frequency-time domain transformation of the divided antenna and point frequency pilot sign includes：
Frequency-time domain transformation is directly carried out to the channel estimation value of all antennas on acquired each frequency pilot sign, obtained
The time domain channel estimate of divided antenna and point frequency pilot sign.
Preferably, described according to peak parameters, the step of whether sending signal is detected to transmitting terminal includes：
Using the peak and peak power in the peak parameters, corresponding average noise power is calculated；
The peak power and average noise power are compared；
If the peak power is more than average noise power and both differences are more than predetermined threshold value, it is determined that detect
Sending signal, otherwise determines to be not detected by sending signal.
Preferably, described according to the peak and/or peak power, to transmitting terminal, whether sending signal is entered
The step of row detection, includes：
Counting has identical peak and/or the probability with identical peak power in the peak parameters；
The obtained probability and predetermined probabilities with identical peak and/or with identical peak power will be counted
It is compared；
If the probability with identical peak and/or with identical peak power is more than predetermined probabilities, it is determined that
Sending signal is detected, otherwise determines to be not detected by sending signal.
According to another aspect of the present invention there is provided a kind of device of signal detection, including：
Channel estimation value acquisition module, the channel estimation value for obtaining all antennas on each frequency pilot sign；
Frequency-time domain transformation module, for passing through the channel estimation value to all antennas on acquired each frequency pilot sign
Frequency-time domain transformation is carried out, time domain channel estimate is obtained；
Peak value searching module, for utilizing all time domain channel estimates, carries out time domain peak search, obtains peak
It is worth corresponding peak parameters；
Signal detection module, for according to the peak parameters, whether sending signal to be detected to transmitting terminal.
Preferably, when the frequency-time domain transformation of the frequency-time domain transformation module includes not divided antenna and the frequency regardless of frequency pilot sign
The frequency-time domain transformation of conversion, divided antenna and frequency-time domain transformation regardless of frequency pilot sign, not divided antenna and point frequency pilot sign,
Any one in the frequency-time domain transformation of divided antenna and point frequency pilot sign.
Preferably, the frequency-time domain transformation module is by the channel estimation of all antennas on acquired each frequency pilot sign
Value is overlapped, and obtains not divided antenna and regardless of the channel estimation value of frequency pilot sign, and to the not divided antenna and
Carried out regardless of the channel estimation value of frequency pilot sign from the conversion process of frequency domain to time domain, obtain not divided antenna and regardless of
The time domain channel estimate of frequency pilot sign.
Preferably, the frequency-time domain transformation module is to the channel estimation on all frequency pilot signs corresponding to every antenna
Value is overlapped, and obtains divided antenna and regardless of the channel estimation value of frequency pilot sign, and to the divided antenna and regardless of
The channel estimation value of frequency pilot sign carries out the conversion process from frequency domain to time domain, obtains divided antenna and is accorded with regardless of pilot tone
Number time domain channel estimate.
Preferably, channel estimation value of the frequency-time domain transformation module to all antennas corresponding to each frequency pilot sign
It is overlapped, obtains the channel estimation value of not divided antenna and point frequency pilot sign, and to the not divided antenna and point leads
The channel estimation value of frequency symbol carries out the conversion process from frequency domain to time domain, obtains not divided antenna and point frequency pilot sign
Time domain channel estimate.
Preferably, channel estimation of the frequency-time domain transformation module to all antennas on acquired each frequency pilot sign
Value directly carries out frequency-time domain transformation, obtains the time domain channel estimate of divided antenna and point frequency pilot sign.
Preferably, the signal detection module utilizes the peak and peak power in the peak parameters, meter
Corresponding average noise power is calculated, and the peak power and average noise power are compared, if the peak
It is worth power more than average noise power and both differences is more than predetermined threshold value, it is determined that detects sending signal, it is no
Then determine to be not detected by sending signal.
Preferably, the signal detection module, which is counted, has identical peak and/or tool in the peak parameters
There is the probability of identical peak power, and there is identical peak and/or with identical peak value by what statistics was obtained
The probability of power is compared with predetermined probabilities, if with identical peak and/or with identical peak power
Probability be more than predetermined probabilities, it is determined that detect sending signal, otherwise determine be not detected by sending signal.
Compared with prior art, the beneficial effects of the present invention are：
1st, testing process of the invention is simple, easily realizes, can not only reduce system processing delay, and right
The process simplification of scheduling of resource and power control etc., which is provided, to be ensured；
2nd, the present invention can accurately detect signal or judge whether DCI0 loses, and reduce empty inspection false dismissal probability,
Improve detection performance.
Brief description of the drawings
Fig. 1 is signal detection flow chart provided in an embodiment of the present invention；
Fig. 2 is signal supervisory instrument block diagram provided in an embodiment of the present invention；
Fig. 3 is signal detection frequency domain process chart provided in an embodiment of the present invention；
Fig. 4 is signal detection Time Domain Processing flow chart provided in an embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing to a preferred embodiment of the present invention will be described in detail, it will be appreciated that described below
Preferred embodiment be merely to illustrate and explain the present invention, be not intended to limit the present invention.
Fig. 1 is signal detection flow chart provided in an embodiment of the present invention, as shown in figure 1, step includes：
Step S101：Obtain the channel estimation value of all antennas on each frequency pilot sign.
Specifically, by being detected to each frequency pilot sign received from all antennas, each pilot tone is obtained
The channel estimation value of all antennas on symbol.
Step S102：Line frequency is entered by the channel estimation value to all antennas on acquired each frequency pilot sign
Shi Bianhuan, obtains time domain channel estimate.
Specifically, step S102 gives following four processing mode：
Mode 1, frequency-time domain transformation is directly carried out to each channel estimation value that step S101 is obtained, that is, divided
The frequency-time domain transformation of antenna and point frequency pilot sign, obtains the time domain channel estimate of divided antenna and point frequency pilot sign.
The mode that frequency-time domain transformation is carried out after superposition is for mode 2 to mode 4, it is specific as follows：
Mode 2, each channel estimation value obtained to step S101 carry out not divided antenna and regardless of frequency pilot sign
Frequency-time domain transformation, i.e., each channel estimation value acquired in step S101 is overlapped, obtains not divided antenna
And regardless of the channel estimation value of frequency pilot sign, and to the not divided antenna and regardless of the channel estimation value of frequency pilot sign
The conversion process from frequency domain to time domain is carried out, not divided antenna is obtained and the time domain channel regardless of frequency pilot sign is estimated
Value.
Mode 3, each channel estimation value obtained to step S101 carry out divided antenna and regardless of frequency pilot sign
Frequency-time domain transformation, i.e., be overlapped to the channel estimation value on all frequency pilot signs corresponding to every antenna, obtain
Divided antenna and estimate regardless of the channel estimation value of frequency pilot sign, and to the divided antenna and regardless of the channel of frequency pilot sign
Evaluation carries out the conversion process from frequency domain to time domain, obtains divided antenna and the time domain channel regardless of frequency pilot sign is estimated
Value.
Mode 4：The each channel estimation value obtained to step S101 carries out not divided antenna and divides frequency pilot sign
Frequency-time domain transformation, i.e., be overlapped to the channel estimation value of all antennas corresponding to each frequency pilot sign, obtain not
The channel estimation value of divided antenna and point frequency pilot sign, and to the channel estimation of the not divided antenna and point frequency pilot sign
Value carries out the conversion process from frequency domain to time domain, obtains the time domain channel estimation of not divided antenna and point frequency pilot sign
Value.
Step S103：Using all time domain channel estimates, time domain peak search is carried out, peak value correspondence is obtained
Peak parameters.
Mode 1, using mode 2 in step S102 (i.e. not divided antenna and regardless of the frequency-time domain transformation of frequency pilot sign),
Result, can directly carry out time domain peak search, obtain the corresponding peak parameters of peak value, peak value ginseng
Number includes peak and/or peak power.
Mode 2, utilize mode 1 in step S102 (i.e. the frequency-time domain transformation of divided antenna and point frequency pilot sign), side
Formula 3 (i.e. divided antenna and regardless of the frequency-time domain transformation of frequency pilot sign) and mode 4 (i.e. not divided antenna and point pilot tone symbol
Number frequency-time domain transformation) result, time domain peak search is directly carried out to each time domain channel estimate, obtained
Take the corresponding peak parameters of peak value on each time domain channel estimate, the peak parameters include peak and
/ or peak power.
Mode 3, utilize mode 1 in step S102 (i.e. the frequency-time domain transformation of divided antenna and point frequency pilot sign), side
Formula 3 (i.e. divided antenna and regardless of the frequency-time domain transformation of frequency pilot sign) and mode 4 (i.e. not divided antenna and point pilot tone symbol
Number frequency-time domain transformation) result, time domain peak will be carried out after resulting all time domain channel estimates superposition
Value search, obtains the corresponding peak parameters of peak value, and the peak parameters include peak and/or peak power.
Step S104：According to the peak parameters, to transmitting terminal, whether sending signal is detected.
Specifically, step S104 depends on above-mentioned steps S103, can enter according to following several processing modes
Row detection process.
Mode 1, the peak obtained according to mode 1 in step S103 and the processing of mode 3 and peak power,
Calculating average noise power, and the peak power that step S103 processing is obtained compared with average noise power
Compared with if peak power is more than average noise power and both differences are more than predetermined threshold value, it is determined that detect transmission
Signal, otherwise determines to be not detected by sending signal.
Mode 2, the result according to mode 2 in step S103, for some time domain channel estimate
The corresponding peak of peak value and peak power, calculate the corresponding average noise work(of the time domain channel estimate
Rate, and the corresponding peak power of time domain channel estimate is compared with average noise power.Simply by the presence of
The corresponding peak power of one time domain channel estimate is more than average noise power and both differences are more than default threshold
Value, it is determined that detect sending signal, otherwise determines to be not detected by sending signal.
Mode 3, in step s 103 mode 2 are handled in obtained all time domain channel estimates, statistics tool
There are identical peak and/or the probability with identical peak power, and there is identical peak value by what statistics was obtained
Position and/or probability with identical peak power are compared with predetermined probabilities, if with identical peak
And/or the probability with identical peak power is more than predetermined probabilities, it is determined that detect sending signal, otherwise really
Surely it is not detected by sending signal.
Fig. 2 is signal supervisory instrument block diagram provided in an embodiment of the present invention, as shown in Fig. 2 including channel estimation
It is worth acquisition module 10, frequency-time domain transformation module 20, peak value searching module 30 and signal detection module 40.
Channel estimation value acquisition module 10 is used for the channel estimation value for obtaining all antennas on each frequency pilot sign,
Specifically, by being detected to each frequency pilot sign received from all antennas, obtain on each frequency pilot sign
The channel estimation value of all antennas.
Frequency-time domain transformation module 20 is used to pass through the channel estimation to all antennas on acquired each frequency pilot sign
Value carries out frequency-time domain transformation, obtains time domain channel estimate.Wherein, when the frequency-time domain transformation includes directly entering line frequency
Frequency-time domain transformation is carried out after conversion, superposition, frequency-time domain transformation is carried out after the superposition includes not divided antenna and regardless of pilot tone
The frequency-time domain transformation of symbol, divided antenna and frequency-time domain transformation, not divided antenna and point frequency pilot sign regardless of frequency pilot sign
Any one in frequency-time domain transformation.That is, frequency-time domain transformation module 20 can also be carried out according to four kinds of modes
Frequency-time domain transformation, be respectively：1st, the frequency-time domain transformation of divided antenna and point frequency pilot sign, i.e., directly carry out frequency-time domain transformation；
2nd, not divided antenna and regardless of the frequency-time domain transformation of frequency pilot sign, i.e., by the institute acquired in channel estimation value acquisition module
There is channel estimation value to carry out frequency-time domain transformation after being overlapped；3rd, divided antenna and regardless of the frequency-time domain transformation of frequency pilot sign,
Frequency-time domain transformation is carried out after being overlapped to the channel estimation value on all frequency pilot signs corresponding to every antenna；
4th, the not frequency-time domain transformation of divided antenna and point frequency pilot sign, i.e., to all antennas corresponding to each frequency pilot sign
Channel estimation value carries out frequency-time domain transformation after being overlapped.
Peak value searching module 30 is used to utilize all time domain channel estimates, carries out time domain peak search, obtains
The corresponding peak parameters of peak value.That is, peak value searching module 30 can be handled frequency-time domain transformation module 20
Obtain each time domain channel estimate and directly carry out time domain peak search, obtain the peak of each time domain channel estimate
It is worth corresponding peak parameters, the corresponding peak parameters of peak value of each time domain channel estimate include peak value position
Put and/or peak power；All time domain channel estimates can also be obtained to the processing of frequency-time domain transformation module 20 to carry out
Superposition, obtains channel estimation superposition value, then carries out time domain peak search to channel estimation superposition value, obtains letter
Estimate the corresponding peak parameters of peak value of superposition value, the corresponding peak value ginseng of peak value of the channel estimation superposition value in road
Number includes peak and/or peak power.
Signal detection module 40 is used for according to the peak parameters, and to transmitting terminal, whether sending signal is detected.
Specifically, what signal detection module 40 can be obtained according to the processing of peak value searching module 30 includes peak
With the peak parameters of peak power, corresponding average noise power is calculated, and by peak power and average noise work(
Rate is compared, if there are the feelings that peak power is more than predetermined threshold value more than average noise power and both differences
Condition, it is determined that detect sending signal, otherwise determines to be not detected by sending signal；Peak value searching can also be counted
What the processing of module 30 was obtained has identical peak and/or the probability with identical peak power, and will statistics
Obtained have identical peak and/or the probability with identical peak power is compared with predetermined probabilities,
If the probability with identical peak and/or with identical peak power is more than predetermined probabilities, it is determined that detection
To sending signal, otherwise determine to be not detected by sending signal.
The present invention is applicable not only to the detection of upward signal, while being also applied for the detection of downstream signal.With up
Exemplified by the detection of signal, it whether there is for signal or whether DCI0 lose, the present invention compares traditional inspection
Survey method, can greatly lift the performance of empty inspection and missing inspection, while it is real to simplify AMC scheduling and power control etc.
Flow is applied, system processing delay is reduced.
Specific workflow is as follows：
The first step：Obtain the channel estimation value of all antennas of each frequency pilot sign.
Acquired channel estimation value can be that the channel estimation value before noise reduction or the channel after noise reduction are estimated
Channel estimation value before evaluation, preferably noise reduction.Assuming that the channel corresponding to all pilot tones and all antennas of acquisition
Estimate, is expressed asWherein l=0,1 ..., NumSym-1, i=0,1 ..., NumAntRx-1, and
NumAntRx represents reception antenna number, and NumSym represents frequency pilot sign number.
Second step：To acquired channel estimation valueFrequency-time domain transformation is carried out, so as to obtain time domain channel estimation
Value.
For second step, type and receiving end flow chart of data processing can be placed according to antenna, select different disposal side
Formula, for example, point symbol and divided antenna processing, divide symbol and regardless of antenna processing, at symbol and divided antenna
Reason, regardless of symbol and regardless of antenna processing.
Mode 1, not divided antenna and handled regardless of symbol.
Channel estimation value corresponding to all antennas on all frequency pilot signs is overlapped, i.e.,So as to obtain the channel estimation value after superposition
It is rightEnter line frequency time-varying, the final channel estimation value for obtaining time domain
Mode 2, divided antenna and handled regardless of symbol.
Channel estimation value on all frequency pilot signs corresponding to every antenna is overlapped, i.e.,
It is rightEnter line frequency time-varying, final every antenna obtains a time domain channel estimate
Mode 3, not divided antenna and a point symbol is handled.
The channel estimation value of all antennas corresponding on each frequency pilot sign is overlapped, i.e.,
It is rightEnter line frequency time-varying, final each frequency pilot sign obtains a time domain channel estimate
Mode 4, divided antenna and a point symbol are handled.
Line frequency time-varying is entered to the channel estimation value of all antennas on each frequency pilot sign, each pilot tone symbol is obtained
The time domain channel estimate of all antennas corresponding to number
3rd step：Time domain is carried out using acquired time domain channel estimate and searches peak, obtains the peak corresponding to peak value
It is worth position and peak power, so as to carry out signal detection judgement.
Three step process can be handled differently, specific as follows：
Mode 1, the time domain channel estimation superposition all frequency pilot signs and antenna, are then searched in time-domain position
Peak power and peak.
Assuming that the peak power of search is expressed as Pmax, and a small window, window are blocked based on peak power or so respectively
On be expressed as L altogether, then the small window is expressed as signal window, except signal is noise window outside window, calculates noise window
Average noise power PNI.Wherein, L is determined according to RB and channel attribute.
By average noise power PNIWith signal peak power PmaxIt is compared, if PmaxMore than PNI, and PmaxWith
PNIDifference be more than predetermined threshold value, i.e. relative threshold value Threhold, then adjudicate detection time-frequency region exist
Signal have received the signal that UE is sent out in other words, otherwise it is assumed that no signal in other words the UE DCI0 lose.
Mode 2, the time domain channel estimate obtained according to second step, carry out time domain peak search respectively.
Assuming that the peak power of search is expressed asIts corresponding peak is expressed as Posm,
The roadmap of Land use systems 1 calculates the average noise power corresponding to each time domain channel estimate respectively
Respectively by noise powerWith corresponding signal peak powerContrasted, if signal peak work(
RateMore than noise powerAndWithDifference be more than relative threshold value Threhold, then adjudicate
The time-frequency region of detection, which has signal and have received the UE in other words, sends out to obtain signal, otherwise it is assumed that no signal or
Say that the DCI0 of the UE loses.
For mode 2, as long as having a court verdict in all judgements for when there is signal, then final judgement should
The DCI0 that region has the signal UE in other words does not lose.
Mode 3, in order to avoid empty inspection caused by pseudo- peak, can also be to each time domain when carrying out peak value judgement
The peak of channel estimation is judged.
If aforesaid way judges that DCI0 loses, and all peaks are identical and/or peak power identical probability
More than 75%, then the DCI0 for equally adjudicating the UE does not lose, i.e., there is signal in the time-frequency region.
For peak, whether identical judgment criterion is：If the peak of a peak power relative to
The peak or left or right of another peak power offset a sampling point position, then it is assumed that two peaks
It is identical.
For there is the interference of the impulse of burst, preferably time domain peak is carried out in the way of point frequency pilot sign
Search, that is to say, that be overlapped to the time domain channel estimate on each frequency pilot sign either in frequency time-varying
It is overlapped before changing, peak-peak and second largest peak value, and peak-peak and second largest peak value pair is then searched for respectively
The peak-peak position and second largest peak value position answered, and judge the peak-peak position between two frequency pilot signs and secondary
Whether big peak is identical, and whether identical judgment criterion can use foregoing judgment criterion to peak.If
There is an identical peak, i.e. peak-peak position or second largest peak value position phase between two frequency pilot signs
Together, then the peak power on the identical peak is defined, and another peak power is rejected, subsequently
Whether lost according to above-mentioned peak power and average noise power diversity judgement UE DCI0.For example, right
In frequency pilot sign a, the maximum peak power P1 of its correspondence time domain channel estimate, peak-peak position is m1,
Second largest peak value power P 2, second largest peak value position m2, for frequency pilot sign b, its correspondence time domain channel estimate
Maximum peak power P3, peak-peak position be n1, second largest peak value power P 4, second largest peak value position n2,
Assuming that m2 is equal to n2, then for frequency pilot sign a, the peak power P2 on peak m2 is defined, together
Sample, it is defined for frequency pilot sign b, the peak power P4 on peak n2.If two peak powers
Peak it is all identical, then the power on two peaks is summed, selects prominent corresponding
Peak is as the peak searched for, and the peak value elimination on another position is fallen, then according to as above
Peak power and the diversity judgement of average noise power UE DCI0 whether lose.For example, for leading
Frequency symbol a, the maximum peak power P1 of its correspondence time domain channel estimate, peak-peak position is m1, secondary
Big peak power P2, second largest peak value position m2, for frequency pilot sign b, its correspondence time domain channel estimate
Maximum peak power P3, peak-peak position is n1, and second largest peak value power P 4, second largest peak value position n2 is false
If m1 is equal to n1, m2 is equal to n2, and now P1 is more than P2 and P4 sums with P3 sums, selects m1 and n1
It is used as the peak searched for.
The present invention judges that what whether especially DCI0 lost sentences suitable for the confidence level of wireless communication field signal
It is disconnected.
For the thought that the present invention is furture elucidated, with up DCI0 loss detections, and with it is therein one kind at
Manage progress embodiment description exemplified by thought.Fig. 3 is signal detection frequency domain handling process provided in an embodiment of the present invention
Figure, as shown in figure 3, step includes：
Step S201：The channel estimation value of all antennas on each frequency pilot sign is calculated using LS.
This step is using method general at present, and no further details to be given herein.Assuming that all frequency pilot signs obtained
It is expressed as with the channel estimation value corresponding to all antennasWherein l=0,1 ..., NumSym-1,
I=0,1 ..., NumAntRx-1, and NumAntRx represents reception antenna number, NumSym represents that pilot tone is accorded with
Number number.
Step S202：To channel estimation valueIt is overlapped.
This step is so that regardless of symbol and not divided antenna carries out frequency-time domain transformation as an example, to all frequency pilot signs and corresponding
The channel estimation value of the frequency domain of all antennas is overlapped, so as to obtain the channel estimation in frequency domain value after superposition
I.e.
Wherein, k=0,1 ..., Num R E-1, Num R E represent the Resource Unit shared by detected user
The length of (Resource Elements, RE) number, i.e. channel estimation.
Step S203：To the channel estimation value after superpositionFrequency-time domain transformation is carried out, is estimated so as to obtain time domain channel
Evaluation.
The mode of conversion can use inverse Fourier transform, so as to obtain time domain channel estimateI.e.Wherein ifft () represents inverse Fourier's change.
Step S204：Obtained time domain channel estimate is calculated using step S203Time domain peak is carried out to search
Rope.
Step S205：Noise power calculation.
The step includes following sub-step：
Sub-step one：Assuming that the peak power of search is Pmax, corresponding peak is Lmax.With peak value position
Put Lmax[L1, L2] is blocked in left and right respectively, and the window is signal window, and all time domain samples in addition to signal window are all true
It is set to noise, as noise window.
Sub-step two：Calculate the average noise power P in noise windowNI；
Step S206：Signal detection is adjudicated.
By signal peak power PmaxWith average noise power PNIContrasted, if signal peak power Pmax
More than average noise power PNI, and meet Pmax-PNI>=Threhold, then adjudicate corresponding time-frequency domain position
On there is signal, otherwise adjudicate the detection zone in the absence of signal, DCI0 loses.
Step S207：Using step S206 result of calculation, if it is determined that there is signal on the time-frequency domain position,
The demodulation of UE signals below is then carried out, includes the processing of symbol level and bit-level, finally reports demodulation result.
For DCI0 court verdict, it can not report in this case, can also be after the completion of symbol level processing
Reported, can also be reported after the completion of bit-level processing, specifically how report the present embodiment not limit
System.If it is determined that the DCI0 of the UE loses on the time-frequency domain position, then follow-up bit-level processing is no longer carried out,
DCI0 testing result is reported simultaneously.
Fig. 4 is signal detection Time Domain Processing flow chart provided in an embodiment of the present invention, as shown in figure 4, step bag
Include：
Step S301：The channel estimation value of all antennas on each frequency pilot sign is calculated using LS.
Assuming that the channel estimation value corresponding to all frequency pilot signs and all antennas that obtain is expressed asWherein
L=0,1 ..., NumSym-1, i=0,1 ..., NumAntRx-1, and NumAntRx represent reception antenna number,
NumSym represents frequency pilot sign number.
Step S302：To acquired channel estimation valueFrequency-time domain transformation is carried out, is estimated so as to obtain time domain channel
Evaluation.
This step is so that point symbol and divided antenna carry out frequency-time domain transformation as an example, to all frequency pilot signs and corresponding all
The channel estimation value of the frequency domain of antenna enters line frequency time-varying, obtains all frequency pilot signs and corresponding all antennas
Time domain channel estimate
Step S303：All time domain channel estimates superposition that step S302 processing is obtained, obtains time domain letter
Estimate superposition value in road.
Step S304：The time domain channel obtained using step S303 processing estimates superposition value, carries out time domain peak
Search, in time-domain position search peak power Pmax。
Step S305：Obtained peak power P is searched for according to step S304max, calculating average noise power PNI。
Step S306：Signal detection is adjudicated.
By average noise power PNIWith signal peak power PmaxIt is compared, if PmaxMore than PNI, and PmaxWith
PNIDifference be more than relative threshold value Threhold, then there is signal and receive in other words in the time-frequency region for adjudicating detection
Arrived the signal that UE is sent out, otherwise it is assumed that no signal in other words the UE DCI0 lose.
Step S307：Using step S306 result of calculation, if it is determined that there is signal on the time-frequency domain position,
The demodulation of UE signals below is then carried out, includes the processing of symbol level and bit-level, finally reports demodulation result,
Otherwise follow-up bit-level processing is no longer carried out, while reporting DCI0 testing result.
The present invention is applied to OFDM (Orthogonal Frequency Division
Multiplexing, OFDM) system, it is any have signal transacting, communication etc. knowledge background engineer, all
Corresponding device, any modifications, equivalent substitutions and improvements made etc. can be designed according to the present invention, it all should
In the thought and scope of the present invention.
Although the present invention is described in detail above, the invention is not restricted to this, the art technology
Personnel can carry out various modifications according to the principle of the present invention.Therefore, all modifications made according to the principle of the invention,
It all should be understood to fall into protection scope of the present invention.
Claims (16)
1. a kind of method of signal detection, it is characterised in that including：
Obtain the channel estimation value of all antennas on each frequency pilot sign；
Frequency-time domain transformation is carried out by the channel estimation value to all antennas on acquired each frequency pilot sign, obtained
Time domain channel estimate；
Using all time domain channel estimates, time domain peak search is carried out, the corresponding peak parameters of peak value are obtained；
According to the peak parameters, to transmitting terminal, whether sending signal is detected.
2. according to the method described in claim 1, it is characterised in that the frequency-time domain transformation includes following processing
One of：
Not divided antenna and regardless of the frequency-time domain transformation of frequency pilot sign；
Divided antenna and regardless of the frequency-time domain transformation of frequency pilot sign；
The not frequency-time domain transformation of divided antenna and point frequency pilot sign；
The frequency-time domain transformation of divided antenna and point frequency pilot sign.
3. method according to claim 2, it is characterised in that the not divided antenna and accorded with regardless of pilot tone
Number frequency-time domain transformation include：
The channel estimation value of all antennas on acquired each frequency pilot sign is overlapped, not divided antenna is obtained
And regardless of the channel estimation value of frequency pilot sign；
Carried out to the not divided antenna and regardless of the channel estimation value of frequency pilot sign at the conversion of frequency domain to time domain
Reason, obtains not divided antenna and regardless of the time domain channel estimate of frequency pilot sign.
4. method according to claim 2, it is characterised in that the divided antenna and regardless of frequency pilot sign
Frequency-time domain transformation include：
Channel estimation value on all frequency pilot signs corresponding to every antenna is overlapped, obtain divided antenna and
Regardless of the channel estimation value of frequency pilot sign；
Carried out to the divided antenna and regardless of the channel estimation value of frequency pilot sign from the conversion process of frequency domain to time domain,
Obtain divided antenna and regardless of the time domain channel estimate of frequency pilot sign.
5. method according to claim 2, it is characterised in that the not divided antenna and point frequency pilot sign
Frequency-time domain transformation include：
The channel estimation value of all antennas corresponding to each frequency pilot sign is overlapped, obtain not divided antenna and
Divide the channel estimation value of frequency pilot sign；
The conversion process from frequency domain to time domain is carried out to the channel estimation value of the not divided antenna and point frequency pilot sign,
Obtain the time domain channel estimate of not divided antenna and point frequency pilot sign.
6. method according to claim 2, it is characterised in that the divided antenna and point frequency pilot sign
Frequency-time domain transformation includes：
Frequency-time domain transformation is directly carried out to the channel estimation value of all antennas on acquired each frequency pilot sign, obtained
The time domain channel estimate of divided antenna and point frequency pilot sign.
7. the method according to claim 1-6 any one, it is characterised in that described to be joined according to peak value
Number, the step of whether sending signal is detected to transmitting terminal includes：
Using the peak and peak power in the peak parameters, corresponding average noise power is calculated；
The peak power and average noise power are compared；
If the peak power is more than average noise power and both differences are more than predetermined threshold value, it is determined that detect
Sending signal, otherwise determines to be not detected by sending signal.
8. the method according to claim 1-2,4-6 any one, it is characterised in that described according to institute
Peak and/or peak power are stated, the step of whether sending signal is detected to transmitting terminal includes：
Counting has identical peak and/or the probability with identical peak power in the peak parameters；
The obtained probability and predetermined probabilities with identical peak and/or with identical peak power will be counted
It is compared；
If the probability with identical peak and/or with identical peak power is more than predetermined probabilities, it is determined that
Sending signal is detected, otherwise determines to be not detected by sending signal.
9. a kind of device of signal detection, it is characterised in that including：
Channel estimation value acquisition module, the channel estimation value for obtaining all antennas on each frequency pilot sign；
Frequency-time domain transformation module, for passing through the channel estimation value to all antennas on acquired each frequency pilot sign
Frequency-time domain transformation is carried out, time domain channel estimate is obtained；
Peak value searching module, for utilizing all time domain channel estimates, carries out time domain peak search, obtains peak
It is worth corresponding peak parameters；
Signal detection module, for according to the peak parameters, whether sending signal to be detected to transmitting terminal.
10. device according to claim 9, it is characterised in that the frequency time-varying of the frequency-time domain transformation module
Change including not divided antenna and the frequency-time domain transformation regardless of frequency pilot sign, divided antenna and regardless of the frequency time-varying of frequency pilot sign
Change, not appointing in the frequency-time domain transformation of the frequency-time domain transformation of divided antenna and point frequency pilot sign, divided antenna and point frequency pilot sign
Meaning one.
11. device according to claim 10, it is characterised in that the frequency-time domain transformation module will be obtained
The channel estimation value of all antennas is overlapped on each frequency pilot sign taken, obtains not divided antenna and regardless of pilot tone
The channel estimation value of symbol, and carried out to the not divided antenna and regardless of the channel estimation value of frequency pilot sign from frequency domain
To the conversion process of time domain, not divided antenna is obtained and regardless of the time domain channel estimate of frequency pilot sign.
12. device according to claim 10, it is characterised in that the frequency-time domain transformation module is to every
The channel estimation value on all frequency pilot signs corresponding to antenna is overlapped, and is obtained divided antenna and is accorded with regardless of pilot tone
Number channel estimation value, and to the divided antenna and regardless of frequency pilot sign channel estimation value carry out from frequency domain then
The conversion process in domain, obtains divided antenna and regardless of the time domain channel estimate of frequency pilot sign.
13. device according to claim 10, it is characterised in that the frequency-time domain transformation module is to each
The channel estimation value of all antennas corresponding to frequency pilot sign is overlapped, and obtains not divided antenna and point frequency pilot sign
Channel estimation value, and the channel estimation value of the not divided antenna and point frequency pilot sign is carried out from frequency domain to time domain
Conversion process, obtain the time domain channel estimate of not divided antenna and point frequency pilot sign.
14. device according to claim 10, it is characterised in that the frequency-time domain transformation module is to being obtained
The channel estimation value of all antennas directly carries out frequency-time domain transformation on each frequency pilot sign taken, obtains divided antenna and divides
The time domain channel estimate of frequency pilot sign.
15. the device according to claim 9-14 any one, it is characterised in that the signal detection
Module utilizes peak and peak power in the peak parameters, calculates corresponding average noise power, and
The peak power and average noise power are compared, if the peak power be more than average noise power and
Both differences are more than predetermined threshold value, it is determined that detect sending signal, otherwise determine to be not detected by sending signal.
16. the device according to claim 9-10,12-15 any one, it is characterised in that the letter
Number detection module, which is counted in the peak parameters, has identical peak and/or with the general of identical peak power
Rate, and the obtained probability with identical peak and/or with identical peak power will be counted with presetting generally
Rate is compared, if the probability with identical peak and/or with identical peak power is more than predetermined probabilities,
Then determine to detect sending signal, otherwise determine to be not detected by sending signal.
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| CN115604060B (en) * | 2022-10-09 | 2023-07-28 | 上海星思半导体有限责任公司 | Peak detection method, device, electronic equipment and storage medium |
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| CN101938435B (en) * | 2009-06-30 | 2013-03-20 | 中兴通讯股份有限公司 | Time bias estimation device and method for orthogonal frequency division multiplexing system |
| CN102523185B (en) * | 2011-12-09 | 2014-11-26 | 大唐移动通信设备有限公司 | Preamble sequence detection method and device |
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| CN112954644B (en) * | 2019-12-11 | 2023-03-14 | 辰芯科技有限公司 | Wireless communication system based on power consumption saving and operation method thereof |
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