CN101753173B - Receiving method and equipment under long time delay extended channel - Google Patents
Receiving method and equipment under long time delay extended channel Download PDFInfo
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- CN101753173B CN101753173B CN 200910221114 CN200910221114A CN101753173B CN 101753173 B CN101753173 B CN 101753173B CN 200910221114 CN200910221114 CN 200910221114 CN 200910221114 A CN200910221114 A CN 200910221114A CN 101753173 B CN101753173 B CN 101753173B
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Abstract
The embodiment of the invention discloses receiving method and equipment under a long time delay extended channel. The method comprise the steps of: performing LMMSE smooth processing to receiving signals; searching signals subjected to the LMMSE smooth processing in multiple paths, and selecting an effective path signal according to a first-path signal after searching in multiple paths; and performing RAKE receiving processing to the first-path signal and the effective path signal. The embodiment of the invention can improve receiving performance under the long time delay extended channel.
Description
Technical field
The present invention relates to signal processing technology, particularly method of reseptance and the equipment under a kind of long time delay extended channel.
Background technology
In the wireless communications environment, because building and ground in the face of the reflection of radio wave, scattering etc., cause the signal of transmitting terminal emission through different propagated to receiving terminal, to have produced multipath signal at receiving terminal.The signal that homophase receives strengthens each other and produces a stronger signal in reception place, and the signal that out-phase receives produces the signal of decline.For to anti-multipath and decline, can process to received signal at receiving terminal, obtain transmitting comparatively accurately with estimation.The receiver that adopts at receiving terminal in the prior art comprises linear minimum mean-squared error (Linear Minimum Mean Square Estimator, LMMSE) equalizer and RAKE receiver.RAKE receiver is to carry out to received signal demodulation, afterwards the signal after the demodulation is carried out high specific and merges.The LMMSE equalizer adopts weighing vector to process to received signal, obtains the signal after the equilibrium, and wherein, the weighing vector that the LMMSE equalizer adopts is for making the minimized vector of mean square error of equalizer output chip (chip) sequence.Performance is widely adopted the LMMSE equalizer owing to having preferably to the less channel of multidiameter delay expansion.
The inventor finds prior art in realizing process of the present invention there are the following problems at least: when the multipath expansion time delay of channel is longer, the weighing vector of LMMSE equalizer needs the performance of long length guarantee equalizer not descend, and long equalizer difficulty accomplish, and on the basis that does not increase existing equalizer length, receptivity is relatively poor again.
Summary of the invention
The embodiment of the invention provides method of reseptance and the equipment under a kind of long time delay extended channel, solves the employing LMMSE equalizer that exists in the prior art when not increasing equalizer length, the problem of poor-performing under long time delay extended channel.
The embodiment of the invention provides the method for reseptance under a kind of long time delay extended channel, comprising:
Carry out to received signal the LMMSE equilibrium treatment;
Signal after the LMMSE equilibrium treatment is carried out Multipath searching, and select the effective diameter signal according to the first footpath signal behind the Multipath searching;
Described first footpath signal and effective diameter signal are carried out the RAKE reception ﹠ disposal.
The embodiment of the invention provides the receiving equipment under a kind of long time delay extended channel, comprising:
The LMMSE balance module is used for carrying out to received signal the LMMSE equilibrium treatment;
The Multipath searching module is used for the signal after the LMMSE equilibrium treatment is carried out Multipath searching, and selects the effective diameter signal according to the first footpath signal behind the Multipath searching;
The RAKE receiver module is used for described first footpath signal and effective diameter signal are carried out the RAKE reception ﹠ disposal.
As shown from the above technical solution, the embodiment of the invention is by carrying out the RAKE reception ﹠ disposal to the signal after the LMMSE equilibrium treatment again, can not be merged processing by the footpath signal with long delay of equilibrium treatment in the time of can be balanced to LMMSE, avoid losing of footpath signal, realize the raising of systematic function.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the accompanying drawing of required use was done to introduce simply during the below will describe embodiment, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the method flow schematic diagram of first embodiment of the invention;
Fig. 2 is the method flow schematic diagram of step 12 in the first embodiment of the invention;
Fig. 3 is the structural representation of the equipment of second embodiment of the invention;
Fig. 4 is the structural representation of Multipath searching module in the second embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite
Fig. 1 is the method flow schematic diagram of first embodiment of the invention, comprising:
Step 11: receiver carries out the LMMSE equilibrium treatment to received signal.
Existing LMMSE equalizer is to adopt filter factor to carry out to received signal filtering to process, and filter coefficient is the variation of tracking signal adaptively, makes error minimum on statistical significance of signal and the actual signal of estimation.Owing in this algorithm, relate to matrix operation, when the channel delay extension length lengthens, require the also corresponding increase of matrix exponent number, this can cause implementation complexity to be exponent increase, is difficult to realize.And if do not increase the length of LMMSE equalizer, just can make the signal that has than long delay can not be by equilibrium.
Step 12: the signal of receiver after to the LMMSE equilibrium treatment carries out Multipath searching, and selects the effective diameter signal according to the first footpath signal behind the Multipath searching.
Through after the LMMSE equilibrium, in the channel delay extension length that its matrix exponent number can comprise, can become a footpath with these footpaths are balanced, because the location aware of this footpath equilibrium after, and always before, be referred to as " directly first ".The footpath that exceeds the matrix exponent number can not be by equilibrium, but can obtain these not by the footpath signal of equilibrium by Multipath searching.And, can be with the ratio of the signal energy of signal energy and head footpath signal greater than the footpath signal of the threshold value that sets in advance as the effective diameter signal.
Fig. 2 is the method flow schematic diagram of step 12 in the first embodiment of the invention, comprising:
Step 21: with Common Pilot Channel (Common Pilot Channel, CPICH) scrambler input signal is carried out multiple descrambling and de-spreading and process.
In order to strengthen antijamming capability and effectively to utilize Radio Resource, the signal of transmitting terminal emission normally needs to carry out scrambling and carries out spread processing, therefore, need to carry out multiple descrambling and de-spreading processing at receiving terminal.Concrete multiple descrambling and de-spreading handling process can adopt existing techniques in realizing, not in the concern scope of the embodiment of the invention.
Step 22: the signal after the multiple descrambling and de-spreading processing is carried out coherent accumulation process.
Step 23: the signal behind the coherent accumulation is carried out noncoherent accumulation process.
Wherein, coherent accumulation refers in identical phase place restituted signal is added up, and noncoherent accumulation refers to the coherent accumulation result is carried out (I)
2+ (Q)
2It is cumulative to carry out same phase after (I, Q are respectively in-phase component and the quadrature component of complex data) computing again.Above-mentioned coherent accumulation is processed and the noncoherent accumulation processing is the means that usually adopt when existing Multipath searching, and concrete coherent accumulation is processed and the noncoherent accumulation handling process can adopt existing techniques in realizing, not in the concern scope of the embodiment of the invention.
Step 24: according to the first footpath signal in the multipath signal after the noncoherent accumulation processing, select the effective diameter signal.
Wherein, from foregoing as can be known, after the LMMSE equilibrium treatment, can be a first footpath signal by equilibrium by the signal of equilibrium, and the position of first footpath signal be known, therefore, can obtain first footpath signal according to known position.
After obtaining first footpath signal, can calculate the energy of first footpath signal, afterwards, with the ratio of signal energy and the energy of head footpath signal greater than the footpath signal of the threshold value that sets in advance as the effective diameter signal.Wherein, threshold value can be specially 1/16.
Further, for convenient disposal, above-mentioned steps 21-24 can adopt the computing of chip level, namely carries out corresponding processing (selecting processing such as multiple descrambling and de-spreading processing, coherent accumulation processing, noncoherent accumulation processing and footpath) take chip as unit.Certainly, also can adopt the processing of 1/2chip level or 1/4chip level.
Step 13: receiver carries out the RAKE reception ﹠ disposal to described first footpath signal and effective diameter signal.
Because the restriction of the exponent number of LMMSE equalizer, the footpath signal that prolongs in the time of can abandoning can cause hydraulic performance decline like this.And in the embodiment of the invention, after the LMMSE equilibrium treatment, also to carry out the RAKE reception ﹠ disposal, and so just can take into account the long footpath signal of time delay, improve systematic function.
The RAKE reception ﹠ disposal is the multipath effect of utilizing radio communication, and the footpath signal on each road of obtaining is carried out respectively demodulation, and then stack output.In demodulating process, can correct the receiving data sequence phase rotating that causes owing to signal fadeout, and can the data sequence be weighted according to the amplitude of the channel fading factor.Through after the demodulation process, the phase place of the footpath signal behind each RAKE reception ﹠ disposal is basically identical, and the weight of the footpath signal weighting that weight is large, signal amplitude is little of the footpath signal weighting that signal amplitude is large is little, in order to realize best merging effect when each footpath signal merges.Afterwards, the footpath signal after the demodulation is alignd in time according to radio frames and time slot position, then by corresponding position addition, obtain receiving data sequence.Owing in demodulating process, carried out amplitude weighting according to the amplitude of the channel fading factor footpath signal after to each RAKE reception ﹠ disposal, therefore, directly with the footpath signal plus behind each each RAKE reception ﹠ disposal, namely realized the high specific merging.Can prove in theory, each path signal be carried out high specific merge the receptivity that can obtain the best.
The embodiment of the invention is utilized above-mentioned RAKE reception ﹠ disposal principle just, first footpath signal and the effective diameter signal that obtains is carried out demodulation and high specific merging, to obtain the optimum reception performance.And concrete demodulation and high specific merging flow process can adopt existing techniques in realizing, not in the concern scope of the embodiment of the invention.
Through LMMSE equilibrium treatment and RAKE reception ﹠ disposal, the embodiment of the invention can on the basis that does not increase the LMMSE equalizer length, improve the receptivity of system.Afterwards, can further carry out soft value to the signal after the above-mentioned processing and calculate, for example, log-likelihood ratio (LogarithmLikelihood Ratio, LLR) computing, and the decoding processing etc.
Table 1-4 is respectively the receptivity comparison sheet of the embodiment of the invention and prior art, and wherein, receptivity refers to the data transfer speed that receiving terminal receives, and unit is kilobits per second (kbps), and the higher representative performance of transmission rate is better.Meaning of parameters in following each table is as follows: footpath spacing, case2 represent channel type, Type2 represents that receiver type is the single antenna receiver, Hset3, Hset6 presentation code mode, Ior is the gross energy that transmits, Ioc is noise energy, Ec is the effective energy that transmits, and the unit of the ratio of energy is decibel (dB).
Table 1
Table 2
Table 3
Table 4
Can find out from above table, under delay extended channel in short-term, for example, when the footpath spacing is 5 code elements (chip), prior art (being specially the LMMSE equalizer) is suitable with the performance of the embodiment of the invention, these in short-term delay extended channel comprise the representative channel of Wideband Code Division Multiple Access (WCDMA) (Wideband Code DivisionMultiple Access, WCDMA), such as PA3, PB3, VA30, VA120 etc.But under long time delay extended channel, for example, when directly spacing was greater than 15chip, the receptivity of the embodiment of the invention was apparently higher than prior art.
Present embodiment receives by carry out RAKE after the LMMSE equilibrium again, can remedy the restriction of LMMSE progression length, on the basis that does not increase the LMMSE equalizer length, improves systematic function.
Fig. 3 is the structural representation of the equipment of second embodiment of the invention, comprises LMMSE balance module 31, Multipath searching module 32 and RAKE receiver module 33, and LMMSE balance module 31 is used for carrying out to received signal the LMMSE equilibrium treatment; Multipath searching module 32 is used for the signal after the LMMSE equilibrium treatment is carried out Multipath searching, and selects the effective diameter signal according to the first footpath signal behind the Multipath searching; RAKE receiver module 33 is used for described first footpath signal and effective diameter signal are carried out the RAKE reception ﹠ disposal.For easy calculation process, Multipath searching module 32 can specifically be used for the signal after the LMMSE equilibrium treatment is carried out the Multipath searching of chip level, 1/2chip level or 1/4chip level.
Wherein, Fig. 4 is the structural representation of Multipath searching module in the second embodiment of the invention, comprises multiple descrambling and de-spreading unit 41, coherent accumulation unit 42, noncoherent accumulation unit 43 and selected cell 44; Multiple descrambling and de-spreading unit 41 is used for carrying out multiple descrambling and de-spreading processing with the signal of CPICH scrambler after to the LMMSE equilibrium treatment; Coherent accumulation unit 42 is used for that the signal after the processing of multiple descrambling and de-spreading is carried out coherent accumulation to be processed; Noncoherent accumulation unit 43 is used for that the signal after the coherent accumulation processing is carried out noncoherent accumulation to be processed; Selected cell 44 is used for the first footpath signal according to the multipath signal after the noncoherent accumulation processing, selects the effective diameter signal.
Wherein, selected cell 44 can comprise the first subelement, and the first subelement is used for calculating the energy of described first footpath signal, with the ratio of signal energy and the energy of head footpath signal greater than the footpath signal of the threshold value that sets in advance as the effective diameter signal.Further, the threshold value of the first subelement employing can be 1/16.
Present embodiment receives by carry out RAKE after the LMMSE equilibrium again, can remedy the restriction of LMMSE progression length, on the basis that does not increase the LMMSE equalizer length, improves systematic function.
Above-described embodiment can be applied in the system that various needs overcome long delay problem in the radio communication, for example, WCDMA, TD SDMA (Time Division Synchronous CodeDivision Multiple Access, TD-SCDMA) etc.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: the various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not limit it, although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment or be equal to replacement technical scheme of the present invention, and these modifications or be equal to replacement and also can not make amended technical scheme break away from the spirit and scope of technical solution of the present invention.
Claims (6)
1. the method for reseptance under the long time delay extended channel is characterized in that, comprising:
Carry out to received signal linear minimum mean-squared error (LMMSE) equilibrium treatment;
Signal after the LMMSE equilibrium treatment is carried out Multipath searching, and select the effective diameter signal according to the first footpath signal behind the Multipath searching;
Described first footpath signal and effective diameter signal are carried out the RAKE reception ﹠ disposal;
Described signal after the LMMSE equilibrium treatment is carried out Multipath searching, and selects the effective diameter signal to comprise according to the first footpath signal behind the Multipath searching:
Carrying out multiple descrambling and de-spreading with the signal of Common Pilot Channel (CPICH) scrambler after to the LMMSE equilibrium treatment processes;
Signal after the processing of multiple descrambling and de-spreading is carried out coherent accumulation to be processed;
Signal after the coherent accumulation processing is carried out noncoherent accumulation to be processed;
According to the first footpath signal in the multipath signal after the noncoherent accumulation processing, select the effective diameter signal;
Select the effective diameter signal to comprise according to head footpath signal:
Calculate the energy of described first footpath signal, with the ratio of signal energy and the energy of head footpath signal greater than the footpath signal of the threshold value that sets in advance as the effective diameter signal.
2. method according to claim 1 is characterized in that, described threshold value is 1/16.
3. method according to claim 1 is characterized in that, describedly signal after the LMMSE equilibrium treatment is carried out Multipath searching comprises:
Signal after the LMMSE equilibrium treatment is carried out the Multipath searching of chip level, 1/2chip level or 1/4chip level.
4. the receiving equipment under the long time delay extended channel is characterized in that, comprising:
Linear minimum mean-squared error (LMMSE) balance module is used for carrying out to received signal the LMMSE equilibrium treatment;
The Multipath searching module is used for the signal after the LMMSE equilibrium treatment is carried out Multipath searching, and selects the effective diameter signal according to the first footpath signal behind the Multipath searching;
The RAKE receiver module is used for described first footpath signal and effective diameter signal are carried out the RAKE reception ﹠ disposal;
Described Multipath searching module comprises:
Multiple descrambling and de-spreading unit is used for carrying out multiple descrambling and de-spreading processing with the signal of Common Pilot Channel (CPICH) scrambler after to the LMMSE equilibrium treatment;
The coherent accumulation unit is used for that the signal after the processing of multiple descrambling and de-spreading is carried out coherent accumulation and processes;
The noncoherent accumulation unit is used for that the signal after the coherent accumulation processing is carried out noncoherent accumulation and processes;
Selected cell is used for the first footpath signal according to the multipath signal after the noncoherent accumulation processing, selects the effective diameter signal;
Described selected cell comprises:
The first subelement is used for calculating the energy of described first footpath signal, with the ratio of signal energy and the energy of head footpath signal greater than the footpath signal of the threshold value that sets in advance as the effective diameter signal.
5. equipment according to claim 4 is characterized in that, the threshold value that described the first subelement adopts is 1/16.
6. equipment according to claim 4 is characterized in that, described Multipath searching module specifically is used for the signal after the LMMSE equilibrium treatment is carried out the Multipath searching of chip level, 1/2chip level or 1/4chip level.
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| CN1585300A (en) * | 2004-06-07 | 2005-02-23 | 东南大学 | Parallelling receiving method by chip balancer and rake receiver |
| WO2006056836A1 (en) * | 2004-11-24 | 2006-06-01 | Nokia Corporation | Fft accelerated iterative mimo equalizer receiver architecture |
| JP2007189271A (en) * | 2006-01-11 | 2007-07-26 | Nec Corp | Receiving apparatus and receiving method thereof, and control program |
| CN101359926A (en) * | 2007-07-31 | 2009-02-04 | 华为技术有限公司 | Receiver, channel estimation method and apparatus |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1585300A (en) * | 2004-06-07 | 2005-02-23 | 东南大学 | Parallelling receiving method by chip balancer and rake receiver |
| WO2006056836A1 (en) * | 2004-11-24 | 2006-06-01 | Nokia Corporation | Fft accelerated iterative mimo equalizer receiver architecture |
| JP2007189271A (en) * | 2006-01-11 | 2007-07-26 | Nec Corp | Receiving apparatus and receiving method thereof, and control program |
| CN101359926A (en) * | 2007-07-31 | 2009-02-04 | 华为技术有限公司 | Receiver, channel estimation method and apparatus |
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