CN100499608C - Method for reducing channel estimation false-alarm probability in TD-SCDMA mobile communication system - Google Patents
Method for reducing channel estimation false-alarm probability in TD-SCDMA mobile communication system Download PDFInfo
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- CN100499608C CN100499608C CNB2005100828982A CN200510082898A CN100499608C CN 100499608 C CN100499608 C CN 100499608C CN B2005100828982 A CNB2005100828982 A CN B2005100828982A CN 200510082898 A CN200510082898 A CN 200510082898A CN 100499608 C CN100499608 C CN 100499608C
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Abstract
Through bran-new post-processing approach of dual detection thresholds, using CRC checking information after TTI demodulating and decoding, and decided result of dual detection thresholds, the disclosed method determines whether there is a transmitted signal or not. Thus, the method reduces misjudge probability (i.e. false alarm rate) of post-processing approach of channel estimation greatly without reducing sensitivity of receiving signal when no signal is transmitted. The invention raises performance and processing efficiency of TD - SCDMA mobile communication system.
Description
Technical field
The present invention relates to the method for channel estimating in a kind of mobile communication system, relate in particular to and use the method that discontinuous emission (Discontinuous Transmission) (hereinafter to be referred as DTX) technology reduces channel estimating thresholding reprocessing false alarm rate in third generation TD SDMA (Time Division-Synchronous CodeDivision Multiple Access) (hereinafter to be referred as the TD-SCDMA) mobile communication system based on time division duplex.
The present invention is applicable to the base station receiver of TD-SCDMA mobile communication system, also applicable to the user terminal receiver.
Background technology
The TD-SCDMA mobile communication system is a kind of third generation CDMA digital mobile communication system based on time division duplex, wherein relates to many key technologies, as: associated detection technique, intelligent antenna beam shaping technology, synchronous control technique etc.The realization of these technology all is to be based upon on the basis of channel estimating, accuracy of channel estimation has very significant effects to the performance of joint-detection, wave beam forming and Synchronization Control, and therefore good channel estimation technique becomes the necessary condition of decision TD-SCDMA performance of mobile communication system.The channel estimation methods of existing TD-SCDMA mobile communication system adopts the B.Steiner channel estimating usually, promptly by training sequence reasonably is set, construct the Toepliz matrix of right circulation, thereby fast fourier transform/invert fast fourier transformation (Fast Fourier Transform/Inverse Fast Fourier Transform with low-cost, abbreviation FFT/IFFT) computing replaces complicated matrix inversion (pseudoinverse) computing, wherein correlation technique is at Steiner B., BAIERP Low cost channel estimation in the uplink receiver of CDMA mobile radiosystems " the low-cost channel estimation methods of up link receiving terminal in the CDMA mobile communication system ", Frequenz, 1993,47 (12): corresponding explanation is arranged among the 292-298.For part is eliminated the influence that additive noise brings, prior art has proposed a kind of noise-reduction method based on the detection threshold reprocessing based on the result of above-mentioned B.Steiner channel estimating, utilization operand seldom can curb some the noise taps in the channel impulse response sequence, wherein correlation technique is at " improvement of low-cost channel estimation methods in the TD-SCDMA system " (communication journal, 2002,23 (10): corresponding explanation is arranged 125-130).
Above-mentioned channel estimation methods all is based on time slot, promptly utilize the middle trained sequence of a time slot burst structure partly to do channel estimating one time, the setting of channel estimating post-processing detection thresholding then is the minimum optimal value of releasing according to signal detection theory of probability of miscarriage of justice, span on the engineering is roughly about 3dB-6dB, and wherein above-mentioned erroneous judgement is meant the signal erroneous judgement is decided to be and disturbs or be signal with determining interference.The setting of but above-mentioned post-processing detection thresholding is to have certainly with this time slot that to transmit be the optimal value of precondition, might not exist at this time slot if transmit, such as the DTX technology that adopts discontinuous emission in the TD-SCDMA mobile communication system, then existing Threshold detection post-processing approach can cause producing a large amount of erroneous judgements on the time slot that does not transmit, be about to noise or disturb erroneous judgement to be signal, thereby carry out follow-up unnecessary processing such as joint-detection, wasted valuable system resource greatly and reduced the treatment effeciency of system; Simultaneously owing to judge by accident to transmitting not transmitting, then quality of signals is poor excessively, seriously disturbed Radio Resource control (Radio ResourcesControl, abbreviation RRC) waits of the judgement of some upper-layer protocols to link-quality, cause some wrong higher level parameters adjustment, exterior ring power such as mistake is controlled adjustment etc., and then has reduced the performance of whole system.
Summary of the invention
At the deficiencies in the prior art, the objective of the invention is to propose to reduce in a kind of TD-SCDMA mobile communication system the method for channel estimation false-alarm probability, promptly utilize the two detection threshold post-processing approach of brand-new height, and the result of determination of utilizing cyclic redundancy check (CRC) (Cyclic Redundancy Check) (hereinafter to be referred as CRC check) information behind Transmission Time Interval (Transmission Time Interval) (hereinafter to be referred as TTI) demodulation coding and two detection threshold was judged having or not of transmitting, thereby on the basis that does not reduce signal receiving sensitivity, greatly reduce the probability of miscarriage of justice (false alarm rate) of the channel estimating reprocessing when not having the emission signal, and then improved the performance and the treatment effeciency of TD-SCDMA mobile communication system.
Reduce the method for channel estimation false-alarm probability in a kind of TD-SCDMA mobile communication system of the present invention, comprise the steps:
Step 1: the time slot that user in a TTI is assigned to carries out the B.Steiner channel estimating, obtains the original channel shock response sequence;
Step 2: above-mentioned original channel shock response sequence is carried out the two detection threshold reprocessings of height, and sign is done in the marker position to the time slot that surpasses the high detection thresholding when obtaining through the reprocessing channel impulse response sequence of low detection threshold;
Step 3: carry out the Data Detection demodulation;
Step 4: all time slots that user in above-mentioned TTI is assigned to repeat above-mentioned steps 1 successively to step 3, Data Detection demodulation until above-mentioned all time slots is all finished, the demodulating data of comprehensive above-mentioned all time slots carries out channel decoding afterwards, obtains all transmission blocks of user in above-mentioned TTI;
Step 5: judge,, then judge among the above-mentioned TTI to transmit, and carry out subsequent treatment according to original mode if all there is the sign above the high detection thresholding in above-mentioned all time slots; Otherwise execution in step 6;
Step 6: the CRC check to above-mentioned all transmission blocks detects, if the CRC check of above-mentioned all transmission blocks is all made mistakes, judges then among the above-mentioned TTI not transmit that receiver is abandoned all transmission blocks among the above-mentioned TTI, does not do any subsequent treatment; Otherwise, judge among the above-mentioned TTI to transmit, and carry out subsequent treatment according to original mode.
Wherein, the two detection threshold reprocessings of the height in the above-mentioned steps 2 comprise the steps:
Step 201: the tap power that calculates above-mentioned original channel shock response sequence;
Step 202: the tap power and the above-mentioned low detection threshold of above-mentioned original channel shock response sequence are compared, if the tap power of above-mentioned original channel shock response sequence greater than above-mentioned low detection threshold, then execution in step 203, otherwise execution in step 204;
Step 203: the tap power and the above-mentioned high detection thresholding of above-mentioned original channel shock response sequence are compared, if the tap power of above-mentioned original channel shock response sequence greater than above-mentioned high detection thresholding, is then done sign to the marker position of above-mentioned time slot; Otherwise execution in step 204;
Step 204: sign is not done in the marker position of above-mentioned time slot.
The setting of the low detection threshold in the above-mentioned steps 202 is the minimum optimal value of releasing according to signal detection theory of probability of miscarriage of justice, and wherein the span on this low detection threshold engineering is roughly about 3dB-6dB.Span on the high detection thresholding engineering in the above-mentioned steps 203 is 6dB-9dB.
The sharpest edges of the method for the invention are by two detection threshold of height are set, allow the not strong signal of some energy, it is the chance that channel impulse response tap power can but can not also obtain demodulation by low detection threshold by the signal of high detection thresholding, obtain to utilize the chance of rake gain, thereby can not reduce the sensitivity that signal receives; Simultaneously, the judgement expanded range whether this method exists transmitting is in whole TTI, make full use of the signal certainty that all corresponding time slots all exist in TTI and disturbed the randomness that distributes at each time slot, obtained some processing gains, greatly reduced and disturb erroneous judgement for the false alarm rate of signal or reduced the high detection thresholding that reaches a certain false alarm rate needs.
Below in conjunction with accompanying drawing, the concrete enforcement of the method for the invention is described in further detail.For those skilled in the art that, from the detailed description to the inventive method, above-mentioned and other purposes of the present invention, feature and advantage will be apparent.
Description of drawings
Fig. 1 is the conventional structure of time slot schematic diagram of TD-SCDMA mobile communication system physical layer.
Fig. 2 is the flow chart of the present invention's one specific embodiment.
Fig. 3 is the particular flow sheet of the two detection threshold last handling processes of the described height of step 3 in the described specific embodiment of Fig. 2.
Embodiment
Below in conjunction with accompanying drawing, be example with the base station receiver of TD-SCDMA mobile communication system, the concrete enforcement of the method for the invention is described in further detail.This technical scheme can be expanded and be used for the wireless time division duplex of other general continental rises (UMTS Terrestrial Radio Access Time DivisionDuplex, abbreviation UTRATDD) base station and the terminal of mobile communication system, even any mobile communication system of utilizing training sequence to do channel estimating.
Fig. 1 is the conventional structure of time slot schematic diagram of TD-SCDMA mobile communication system physical layer.As scheme shown in the i; the conventional time slot of TD-SCDMA mobile communication system physical layer comprises data symbol (Data symbols); training sequence (Midamble); simultaneous bias symbol (SynchronisationShift symbols; be called for short SS symbols); transmitting power control character (Transmit PowerControl symbols; be called for short TP (Csymbols) and protection period (Guard Period; be called for short GP); wherein above-mentioned training sequence (Midamble) occupies 144 chips, and the conventional time slot of whole TD-SCDMA mobile communication system physical layer occupies 864 chips.
Fig. 2 is the flow chart of the present invention's one specific embodiment.As shown in Figure 2, it mainly may further comprise the steps:
Even the marker position of step 1, initialization time slot is F
Ts=0, wherein subscript ts represents the time slot index;
Step 3, to above-mentioned
Carry out the two detection threshold reprocessings of height, obtain reprocessing channel impulse response sequence
Step 4, utilize above-mentioned
To the data division e among the above-mentioned time slot received signal e
Data1And e
Data2Carry out Data Detection, obtain detecting the bit sequence after the demodulation
, wherein above-mentioned data detecting method is a lot, for example the associated detecting method that often adopts in the base station receiver of TD-SCDMA mobile communication system;
Step 5, all time slots that user in the above-mentioned TTI is assigned to repeat above-mentioned steps 1 successively to step 4, all finish up to the Data Detection of all time slots, and this moment, we obtained the marker position { F of all time slots
1, F
2... F
TSAnd the detection demodulation of all time slots after bit sequence { d
1, d
2... d
TS, wherein TS is the number of time slots that comprises in the TTI, we are to bit sequence { d then
1, d
2... d
TSCarry out channel decoding, obtain all the transmission block { B of user among this TTI
1, B
2... B
L, on wherein the transmission block number of user in the TTI;
Step 6, logic and operation is carried out in the marker position of above-mentioned all time slots, if satisfy F=(F
1﹠amp; F
2﹠amp; ... ﹠amp; F
TS)=1, wherein Fu Hao ﹠amp; Be the logic and operation symbol, promptly the marker position of all time slots all is 1 among the TTI, then judges among this TTI to transmit, and carries out subsequent treatment according to original mode; Otherwise, execution in step 7;
If step 7 satisfies F=F
1﹠amp; F
2﹠amp; ... ﹠amp; F
TSAll the transmission block { B among this TTI are then checked in)=0
1, B
2... B
LCRC check whether make mistakes, if the CRC check of above-mentioned all transmission blocks is all made mistakes, judge then among this TTI not transmit that this moment, receiver should abandon all transmission blocks among this TTI, did not do any subsequent treatment; If instead there is the CRC check of one or more transmission blocks correct, then judges among this TTI to transmit, and carry out subsequent treatment according to original step.
Fig. 3 is the particular flow sheet of the two detection threshold last handling processes of the described height of step 3 in the described specific embodiment of Fig. 2.As shown in Figure 3, the step 3 among above-mentioned Fig. 2 may further comprise the steps:
The tap power of step 301, the above-mentioned original channel impulse response of calculating
Step 302, with above-mentioned tap power
Compare with above-mentioned low detection threshold P1, if satisfy
Then execution in step 303, otherwise execution in step 304;
Step 303, with above-mentioned tap power
With above-mentioned high detection thresholding P
hCompare, if satisfy
Then the marker position of above-mentioned time slot is done mark and put 1, even F
Ts=1; Otherwise execution in step 304;
Step 304, do not change the marker position of above-mentioned time slot, i.e. F
Ts=0.
Wherein, the setting of the low detection threshold in the above-mentioned steps 302 is the minimum optimal value of releasing according to signal detection theory of probability of miscarriage of justice, and the span on this low detection threshold engineering is roughly about 3dB-6dB.Span on the high detection thresholding engineering in the above-mentioned steps 203 is 6dB-9dB.
More than describe operation principle of the present invention in detail, but the example of this visualization of just lifting for the ease of understanding should not be considered to be limitation of the scope of the invention.Equally; the ordinary skill of technical field all can be according to the description of technical scheme of the present invention and preferred embodiment thereof under any; make various possible being equal to and change or replacement, but all these changes or replacement all should belong to the protection range of claim of the present invention.
Claims (4)
1, reduces the method for channel estimation false-alarm probability in a kind of TD-SCDMA mobile communication system, it is characterized in that comprising the steps:
Step 1: the time slot that user in a Transmission Time Interval is assigned to carries out the B.Steiner channel estimating, obtains the original channel shock response sequence;
Step 2: above-mentioned original channel shock response sequence is carried out the two detection threshold reprocessings of height, and sign is done in the marker position to the time slot that surpasses the high detection thresholding when obtaining through the reprocessing channel impulse response sequence of low detection threshold;
Step 3: the data to all time slots are carried out the Data Detection demodulation;
Step 4: all time slots that user in above-mentioned Transmission Time Interval is assigned to repeat above-mentioned steps 1 successively to step 3, Data Detection demodulation until above-mentioned all time slots is all finished, data after the detection demodulation of comprehensive above-mentioned all time slots are carried out channel decoding afterwards, obtain all transmission blocks of user in above-mentioned Transmission Time Interval;
Step 5: adjudicate,, then judge in the above-mentioned Transmission Time Interval to transmit, and carry out subsequent treatment according to original mode if all there is the sign above the high detection thresholding in above-mentioned all time slots; Otherwise execution in step 6;
Step 6: the cyclic redundancy check (CRC) to above-mentioned all transmission blocks detects, if the cyclic redundancy check (CRC) of above-mentioned all transmission blocks is all made mistakes, then judge in the above-mentioned Transmission Time Interval and do not transmit, receiver is abandoned all transmission blocks in the above-mentioned Transmission Time Interval, does not do any subsequent treatment; Otherwise, judge in the above-mentioned Transmission Time Interval to transmit, and carry out subsequent treatment according to original mode.
2, method according to claim 1 is characterized in that the two detection threshold reprocessings of height in the above-mentioned steps 2 comprise the steps:
Step 201: the tap power that calculates above-mentioned original channel shock response sequence;
Step 202: the tap power and the above-mentioned low detection threshold of above-mentioned original channel shock response sequence are compared, if the tap power of above-mentioned original channel shock response sequence greater than above-mentioned low detection threshold, then execution in step 203, otherwise execution in step 204;
Step 203: the tap power and the above-mentioned high detection thresholding of above-mentioned original channel shock response sequence are compared, if the tap power of above-mentioned original channel shock response sequence greater than above-mentioned high detection thresholding, is then done sign to the marker position of above-mentioned time slot; Otherwise execution in step 204;
Step 204: sign is not done in the marker position of above-mentioned time slot.
3, method according to claim 2, the setting that it is characterized in that the low detection threshold in the above-mentioned steps 202 are the minimum optimal values of releasing according to signal detection theory of probability of miscarriage of justice, and wherein the span that should hang down on the detection threshold engineering is 3dB-6dB.
4, method according to claim 2 is characterized in that the span on the high detection thresholding engineering in the above-mentioned steps 203 is 6dB-9dB.
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| CN101136805B (en) * | 2007-05-30 | 2010-06-09 | 中兴通讯股份有限公司 | Performance warning system and performance threshold obtaining method |
| CN101442361B (en) * | 2007-11-22 | 2013-12-18 | 华为技术有限公司 | Method for regulating demodulation threshold, terminal and network entity |
| CN101753265B (en) * | 2008-12-16 | 2012-12-12 | 华为技术有限公司 | False alarm check method, device and user equipment |
| CN106255136B (en) * | 2016-09-13 | 2020-04-14 | 京信通信系统（中国）有限公司 | DTX (discontinuous Transmission) judging method and device |
| CN107463444A (en) * | 2017-07-13 | 2017-12-12 | 中国航空工业集团公司西安飞机设计研究所 | A kind of false alarm rate distribution method |
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Non-Patent Citations (2)
| Title |
|---|
| TD-SCDMA系统中低代价信道估计方法的改进. 康绍莉，裘正定，李世鹤.通信学报，第23卷第10期. 2002 |
| TD-SCDMA系统中低代价信道估计方法的改进. 康绍莉，裘正定，李世鹤.通信学报，第23卷第10期. 2002 * |
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