CN100492951C - Soft judging and soft judging weighting method in up channel multiple user receivers - Google Patents
Soft judging and soft judging weighting method in up channel multiple user receivers Download PDFInfo
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- CN100492951C CN100492951C CNB031213499A CN03121349A CN100492951C CN 100492951 C CN100492951 C CN 100492951C CN B031213499 A CNB031213499 A CN B031213499A CN 03121349 A CN03121349 A CN 03121349A CN 100492951 C CN100492951 C CN 100492951C
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Abstract
This invention discloses a method for soft decision and its weight in an up-line channel multiuser receiving device used in the up-line channel of applying the bit repeat method in the rate match including the following steps: to carry out the rate match back to the RAKE merge result of the input channel and its noise power separately to get the soft decision of each symbol of the present input channel by soft decision computing to the two rate match back result then to carry out weight to the result and the rate match to the weight result increasing the performance of a multiuser receiving device utilizing the diversity effect of the repeated bit in the rate match back.
Description
Technical field
The present invention relates to code division multiple access (CDMA) mobile communication technology field, be meant soft-decision and soft-decision method of weighting in a kind of up channel multi-user receiving system especially.
Background technology
Generally contain soft-decision and soft-decision weighted units in the present up channel multi-user receiving system, finishing at the signal to input channel needs to enter soft-decision and the soft-decision weighted results that soft-decision and soft-decision weighted units are calculated each symbol of user after the processing such as despreading, symbol correction, RAKE merging, and give user's signal regeneration unit with this result, to realize Multiuser Detection.Near user's transmission symbol, symbol level that the signal regeneration unit obtains and chip-level regenerated signal are just accurate more more for the soft-decision weighted results, and in follow-up interference cancellation unit, interference cancellation gets also just thorough more, and the performance of Multiuser Detection is also just good more.Therefore, this soft-decision and soft-decision method of weighting are very important.What double-weighing parallel interference cancellation method adopted is exactly soft-decision and soft-decision method of weighting.
In the up channel of WCDMA up channel and other CDAM systems,, the link of rate-matched is arranged all in the chnnel coding in order to satisfy certain transmission rate request.Adopt the bit repetitive mode in the rate-matched link, and present soft-decision and soft-decision method of weighting are not utilized the repetition bits in the channel speed coupling more, thereby can't further improve the accuracy of soft-decision and the calculating of soft-decision weighted units.
Summary of the invention
In view of this, the object of the present invention is to provide soft-decision and soft-decision method of weighting in a kind of multi-user's receiving system of up channel.This method is utilized the diversity effect of repetition bits in the anti-matching process of speed in the rate-matched, further improves the performance of multi-user's receiving system.
Soft-decision and soft-decision method of weighting in a kind of up channel multi-user receiving system are applied in the rate-matched to adopt the up channel of bit repetition methods, may further comprise the steps at least:
A) the RAKE amalgamation result of input channel and the noise power of this channel are comprised the anti-preliminary treatment of mating of speed respectively at least;
B) calculate in conjunction with carrying out soft-decision by the anti-matching result of two speed that step a) is obtained, obtain the soft-decision of current each symbol of input channel, then the soft-decision result is carried out the soft-decision weighting;
C) the soft-decision weighted results that obtains in the step b) is comprised at least the anti-processing back output of rate-matched.
This method step a) carries out further comprising before the anti-coupling of speed to the noise power of current input channel: obtain the noise power that the RAKE amalgamation result of this each symbol of channel comprises by associated information calculation.
The described relevant information of this method is the noise power information of the input channel that obtained by pilot frequency information.
In the method when described input channel be when containing the multipling channel of an above subchannel, before step a), respectively the noise power of the RAKE amalgamation result of input channel and this channel is carried out demultiplexing and obtain more than one subchannel, each subchannel is carried out the described processing of step a) respectively as input channel; Further comprise after the step c): the output result to this above subchannel carries out multiplexing.
If described in the method input channel has passed through interweave, then step a) takes a step forward and comprises: to current input channel deinterleaving, further comprise after the step c): to the output result of the step c) back output that interweaves.
By such scheme as can be seen soft-decision and the soft-decision method of weighting in multi-user's receiving system of a kind of up channel provided by the present invention merge by the content that the anti-coupling of the speed of input channel is reached repetition bits, produce the effect of similar diversity.Content after being combined is again carried out soft-decision and soft-decision weighting, thereby has made full use of the bit that repeats in the input channel rate-matched, and then has improved the performance of multi-user's receiving system.
Description of drawings
Accompanying drawing 1 is the cataloged procedure schematic diagram of DPDCH channel in the uplink special physical channel;
Accompanying drawing 2 is the overview flow chart of DPDCH channel soft-decision and soft-decision method of weighting in multi-user's receiving system of uplink special physical channel;
Accompanying drawing 3 is DPDCH channel soft-decision and a soft-decision method of weighting preprocessing process particular flow sheet in multi-user's receiving system of uplink special physical channel;
Accompanying drawing 4 is DPDCH channel soft-decision and the anti-processing procedure particular flow sheet of soft-decision method of weighting in multi-user's receiving system of uplink special physical channel.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
Common multi-user's receiving system for up channel, input channel is finished to be needed after RAKE merges in conjunction with the noise power of this channel the RAKE amalgamation result of channel to be carried out soft-decision and soft-decision weighting, the quality of soft-decision and soft-decision weighing computation results directly influences the follow-up signal processing procedure, and the performance of decision up channel multi-user receiving system.
The present invention proposes soft-decision and soft-decision method of weighting in a kind of up channel multi-user receiving system, be applicable to the up channel that adopts the bit repetition methods in the rate-matched.This method is converted to soft-decision and the soft-decision weighting problem of finding the solution the RAKE amalgamation result of this channel before rate-matched by the RAKE amalgamation result of input channel and the noise power of this channel are carried out the anti-matching treatment of speed with soft-decision and the soft-decision weighting problem of directly finding the solution channel RAKE amalgamation result.After the soft-decision and soft-decision weighted results that obtain the RAKE amalgamation result of this channel before rate-matched, the through-rate coupling obtains the soft-decision weighted results of this channel RAKE amalgamation result again.So utilize the diversity effect of bit in the anti-coupling of speed that repeats in the rate-matched dexterously, thereby further improved the performance of multi-user's receiving system of uplink special physical channel.
Soft-decision and soft-decision weighting procedure with the RAKE amalgamation result of special-purpose physical data channel (DPDCH) in the uplink special physical channel multi-user receiving system in the WCDMA system comparatively commonly used at present is that example is further elaborated to the inventive method below.
DPDCH is composited by Dedicated Traffic Channel (DTCH) and two subchannels of Dedicated Control Channel (DCCH).
Have a look the chnnel coding process of the information bit of DPDCH in the uplink special physical channel earlier.Referring to shown in Figure 1, at first, respectively DTCH information bit and DCCH information bit two paths of signals are encoded, wherein this process comprises specifically that the Cyclic Redundancy Check bit calculates, the tail bit adds, coding, interweaves and processing such as wireless frame segmentation for the first time.Then, again the result of DTCH, DCCH two path channels is carried out rate-matched respectively, i.e. DTCH rate-matched and DCCH rate-matched, rate-matched are to adopt the bit repetitive mode.At last that rate-matched is intact DTCH signal and DCCH signal multiplexing are the DPDCH signal, and this DPDCH signal is carried out interweaving the second time, thereby obtain the bit sequence that DPDCH sends.
Consider that user (UE) holds when encoding according to the agreement of 3GPP for the uplink special physical channel of above-mentioned this WCDMA system, DTCH and DCCH will pass through rate-matched.For the uplink special physical channel of rate-matched employing bit repetitive mode, when receiving terminal was deciphered, the bit that repeats in the rate-matched can produce the effect of similar diversity in the anti-matching process of speed, improved the performance of decoding.Thereby the present invention proposes a kind of soft-decision and soft-decision method of weighting of new user receiving device.
Referring to shown in Figure 2: step 201, to the input the DPDCH signal the RAKE amalgamation result and the input DPDCH noise power carry out preliminary treatment.
Pretreated detailed process is referring to shown in Figure 3.Carry out respectively to the preliminary treatment of the RAKE amalgamation result of DPDCH signal with to the preliminary treatment of noise power, the first half is the preprocessing process to DPDCH channel RAKE amalgamation result among Fig. 3: corresponding to cataloged procedure shown in Figure 1, at first the RAKE amalgamation result of DPDCH channel of input is separated and interweaved for the second time; Carry out demultiplexing then and obtain the RAKE amalgamation result of DTCH and the RAKE amalgamation result of DCCH; Respectively the RAKE amalgamation result of the RAKE amalgamation result of DTCH and DCCH is carried out at last that speed is counter mates.
Meanwhile the noise power of DPDCH is carried out preliminary treatment, its process is referring to Fig. 3 the latter half: at first the noise power calculation by the DPCCH channel of input goes out DPDCH; Then the DPDCH channel noise power is separated and interweaved for the second time; Again the result is carried out demultiplexing and obtain DTCH noise power and DCCH noise power; At last DTCH noise power and DCCH noise power are carried out respectively that speed is counter mates.
Wherein, the calculating of the noise power that the RAKE amalgamation result of each symbol of channel is comprised can be different for the different channels situation, because not directly this channel noise power input in the present embodiment, therefore need obtain by the noise power conversion of correlated channels, and, then can be directly calculate the noise power that the RAKE amalgamation result of each symbol comprises by the noise power of this channel for the channel that noise power input is arranged.
The anti-detailed process of handling is referring to shown in Figure 4: at first, the soft-decision weighted results of the DTCH of input is carried out rate-matched, simultaneously, the soft-decision weighted results of DCCH is carried out rate-matched; Then, carry out multiplexing to DTCH and DCCH two-way input signal; The result that will obtain carries out interweaving the second time at last, thereby obtains the soft-decision weighted results of DPDCH, follow-up signal processing is carried out in this result's output.
In above-mentioned preprocessing process, be the anti-process of DTCH rate-matched among Fig. 1 to the anti-coupling of the speed of the RAKE amalgamation result of DTCH.Equally, the anti-coupling of the speed of the noise power of DTCH also is the anti-process of DTCH rate-matched among Fig. 1.It is duplicate handling the RAKE amalgamation result of DPDCH and the anti-computational methods of mating of two DTCH speed of processing noise power among Fig. 3, and just their input signal is different with output signal.
Equally, the anti-coupling of the speed of the RAKE amalgamation result of DCCH is the anti-process of DCCH rate-matched among Fig. 1.The anti-coupling of the speed of the noise power of DCCH also is the anti-process of DCCH rate-matched among Fig. 1.The anti-computational methods of mating of two DCCH speed among Fig. 3 also are duplicate.
The concrete grammar of the anti-coupling of speed in the elucidated hereinafter present embodiment.The anti-coupling of this speed is to hold DPDCH chnnel coding rate-matched partly one to one with UE.
If the incoming symbol sequence is X (i), i=1,2,3 ..., i
1Through rate-matched, obtain symbol sebolic addressing Y (i), i=1,2,3 ..., i
2In rate-matched is under the situation about evenly repeating, i
1＜i
12Two class symbols are arranged: X (n in rate-matched
1) and X (n
2).X (n
1) through the processing of rate-matched, in output sequence, be repeated, promptly in output sequence, there are two symbols to satisfy: Y (q
1)=Y (q
2)=X (n
1).X (n
2) then become the symbol Y (j) among the output sequence Y (n), and Y (j)=X (n
2).Sequence number q
1, q
2With the computational methods of j referring to agreement 25.212.
The anti-coupling of the speed of above-mentioned rate-matched then is defined as follows:
Known array YY (i), i=1,2,3 ..., i
2, the anti-matching sequence of the speed of this sequence is XX (i), i=1, and 2,3 ..., i
1Symbol among the XX (i) divides two classes: XX (n
1) and XX (n
2).XX(n
1)＝YY(q
1)+YY(q
2)；XX(n
2)＝YY(j)。
Can see from the anti-computational process of mating of speed: corresponding to the YY (q of same-sign
1) and YY (q
2) combine.If with YY (q
1) be former symbol, with YY (q
2) be the symbol that repeats, in the anti-coupling of speed, YY (q
2) play the effect of similar diversity.
After finishing the anti-matching process of speed, again DTCH and DCCH signal are carried out soft-decision and soft-decision weighting, the computational methods of soft-decision and soft-decision weighting are same as the prior art.
Soft-decision and soft-decision weighted results that the inventive method will directly be found the solution the DPDCH channel by preliminary treatment are converted to anti-soft-decision and the soft-decision weighted results of mating back DTCH and DCCH channel of velocities solved.Because in the anti-coupling of therein speed, the diversity effect of replicator is found the solution the soft-decision of DTCH, DCCH and is directly found the solution DPDCH channel soft-decision and compare and can obtain more performance.The size of the performance gain that this conversion produces is decided by the repetition rate of rate-matched
: repetition rate is high more, and performance gain is big more.At last the soft-decision weighted results of DTCH and DCCH channel is converted again to the soft-decision weighted results of DPDCH channel.
In uplink special physical channel, speed is that rate-matched all adopts the bit repetitive mode in the uplink special physical channel of 12.2kbps, 64kbps and 144kbps, therefore, in uplink special physical channel, the soft-decision of present embodiment and soft-decision method of weighting all are suitable for these three kinds of DPCH.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1, soft-decision and the soft-decision method of weighting in a kind of up channel multi-user receiving system is applied in the rate-matched to adopt the up channel of bit repetition methods, it is characterized in that may further comprise the steps at least:
A) the RAKE amalgamation result of input channel and the noise power of this channel are comprised the anti-preliminary treatment of mating of speed respectively at least;
B) calculate in conjunction with carrying out soft-decision by the anti-matching result of two speed that step a) is obtained, obtain the soft-decision of current each symbol of input channel, then the soft-decision result is carried out the soft-decision weighting;
C) the soft-decision weighted results that obtains in the step b) is comprised at least the anti-processing back output of rate-matched.
2, method according to claim 1, it is characterized in that step a) carries out further comprising before the anti-coupling of speed to the noise power of current input channel: obtain the noise power that the RAKE amalgamation result of this each symbol of channel comprises by associated information calculation.
3, method according to claim 2 is characterized in that, described relevant information is the noise power information of the input channel that obtained by pilot frequency information.
4, method according to claim 1, it is characterized in that, when described input channel is when containing the multipling channel of an above subchannel, before step a), respectively the noise power of the RAKE amalgamation result of input channel and this channel is carried out demultiplexing and obtain more than one subchannel, each subchannel is carried out the described processing of step a) respectively as input channel; Further comprise after the step c): the output result to this above subchannel carries out multiplexing.
5, method according to claim 1, it is characterized in that, if described input channel has passed through interweave, then step a) takes a step forward and comprises: to current input channel deinterleaving, further comprise after the step c): to the output result of the step c) back output that interweaves.
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