CN103595443A - Multi-path searching method and system of WCDMA system - Google Patents
Multi-path searching method and system of WCDMA system Download PDFInfo
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Abstract
The invention provides a multi-path searching method of a WCDMA system. The multi-path searching method of the WCDMA system comprises the steps that the peak position is searched according to a power delay matrix of a received signal of the WCDMA system, and a fat path of the signal is judged; the main path position in the fat path is adjusted according to the signal characteristic of the fat path and the auxiliary path position, and a new main path position is obtained; a new auxiliary path position is searched on the two sides of an auxiliary path according to the new main path position. The invention further provides a multi-path searching system of the WCDMA system. By means of the multi-path searching method and system of the WCDMA system, firstly the peak position is searched according to the power delay matrix of the signal of the WCDMA system, the fat path of the signal is judged, the main path position in the fat path is adjusted according to the signal characteristic of the fat path and the auxiliary path position, the new auxiliary path position is searched according to the adjusted main path position, the accurate main path position and the auxiliary path position are obtained, and therefore the multi-path searching is achieved, the complex rate of the algorithm is low, the accuracy of a search result is ensured, the multi-path searching efficiency is improved, and the searching cost is lowered.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of multipath searching method and system of WCDMA system.
Background technology
WCDMA (Wideband Code Division Multiple Access, Wideband Code Division Multiple Access (WCDMA)) in system, conventionally adopt RAKE receiver to carry out reception & disposal to broadband signal, wherein the location of catching for multi-path location is to guarantee one of committed step that the final decoding of signal is correct.In traditional Multipath searching, in order to guarantee the uncorrelated of each footpath, between the footpath that search obtains, interval minimum is 1 chip, yet in actual environment, conventionally has the situation of many footpaths in a chip, has fat footpath phenomenon.
Traditional Multipath searching algorithm is that the signal of reception is obtained to power-delay matrix (PDP:Power Delay Profile) by carrying out relevant treatment with local scrambler after matched filter, by peak value, adjudicate the path position information that obtains again, yet the existence due to fat footpath, peak in PDP can be offset, and causes two path positions in fat footpath all can not be located accurately.In order to support higher transmission rate, in WCDMA system, introduced E-DPDCH (E-DCH Dedicated Physical Data Channel, transmit ascending data), adopt the spreading code that spreading factor is 2, introduce 16QAM (Quadrature Amplitude Modulation, digital modulator) high order modulation technology simultaneously.Therefore in order to resist the impact of coloured noise, need to adopt GRAKE reception technique, this has higher requirement to Multipath searching, and therefore, traditional Multipath searching algorithm is no longer satisfied the demand.
In the existing Multipath searching technology for fat footpath phenomenon, mainly contain three kinds of relevant processing methods, method one, directly carries out position adjustment to two footpaths in fat footpath according to its energy; Method two, adjusts according to the position of slow value diameter in the morning calculating; Method three, utilizes interative computation to disturb elimination to time-delay power matrix, then carries out Multipath searching.Below these three kinds of methods are described in detail:
Method one, when two footpaths lean on very near time, if two footpath energy equivalences, can only slide or keep original position to deviating from direction, if wherein a footpath is obviously better than another, powerful can being free to slide, can only slide to deviating from strong footpath direction in weak footpath, if weak footpath is too close powerful and also will slide toward powerful direction time, delete this weak footpath; The a pair of multipath adjustment of method is very rough, only according to the energy of multipath, adjusts, and can not guarantee that the position in two footpaths is all looked for very accurate.
Method two, use multi-path tracing method to adjust path position, utilize path position that traditional Multipath searching obtains with and 1/2chip position, front and back carry out to received signal descrambling and de-spreading processing, and carry out accumulation process obtain early in value late, slow value in morning is revised, utilized the position of slow value diameter in morning to adjust; Method two according in the morning calculating late value path position is adjusted, can not resist the impact that bring in fat footpath, still can not guarantee that the position in Xia Liangtiao footpath, fat footpath is all arrived very accurate, and algorithm complexity comparatively.
Method three, processes and obtains up-sampling signal y with pilot frequency sequence to received signal, according to | y|
2global maximum and described global maximum near common M sampled point, by using the raised cosine of peak value zero setting to carry out interative computation, current multipath waveform is deducted the contribution margin of other multipath waveforms, obtain the up-sampling signal of residual error minimum in M group up-sampling signal, obtain the time delay power spectrum of the up-sampling signal of described residual error minimum; Method three is to utilize the raised cosine of peak value zero setting to carry out interative computation near a plurality of points PDP peak value, eliminates the interference of current multipath waveform to other multipath waveforms, obtains the time delay power spectrum of the up-sampling signal of residual error minimum, then carries out Multipath searching.This algorithm, needs to carry out interative computation to each PDP peak value, and carries out secondary Multipath searching in gamut, and algorithm is comparatively complicated.
In sum, multipath searching method of the prior art, is difficult to search out multipath information accurately under the prerequisite of low algorithm complex.
Summary of the invention
Based on this, be necessary for the problems referred to above, provide a kind of and can under the prerequisite of low algorithm complex, search out multipath searching method and the system of the WCDMA system of multipath information accurately.
A multipath searching method for WCDMA system, comprises the steps:
According to the power-delay matrix of the signal of the WCDMA system receiving, search out peak, and rule out the fat footpath of signal;
According to the signal characteristic in fat footpath and auxiliary path position, the main path position in fat footpath is adjusted, obtained new main path position;
The auxiliary path position making new advances in described auxiliary footpath two-sided search according to new main path position.
A Multipath searching system for system, comprising:
Fat footpath judging module, for searching out peak according to the power-delay matrix of the signal of the WCDMA system receiving, and rules out the fat footpath of signal;
Main footpath adjustment module, for according to the signal characteristic in fat footpath and auxiliary path position, the main path position in fat footpath being adjusted, obtains new main path position;
Auxiliary path search module, for the auxiliary path position making new advances in described auxiliary footpath two-sided search according to new main path position.
The multipath searching method of above-mentioned WCDMA system and system, first according to the power-delay matrix of the signal of system, search out peak and rule out fat footpath, according to the signal characteristic in fat footpath and auxiliary path position, the main path position in fat footpath is adjusted, according to the main path position after adjusting, search for new auxiliary path position again, obtain main path position and auxiliary path position accurately, thereby realize Multipath searching, algorithm complex is low and can guarantee the accuracy of Search Results, has improved the efficiency of Multipath searching and has reduced searching cost.
Accompanying drawing explanation
Fig. 1 is the flow chart of multipath searching method of the WCDMA system of an embodiment;
Fig. 2 is the flow chart of an algorithm examples of multipath searching method of WCDMA system;
Fig. 3 is the Multipath searching system configuration schematic diagram of the WCDMA system of an embodiment.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of the multipath searching method of WCDMA system of the present invention is described in detail.
Shown in Figure 1, Fig. 1 is the flow chart of multipath searching method of the WCDMA system of an embodiment, mainly comprises the steps:
Step S1: search out peak according to the power-delay matrix of the signal of the WCDMA system receiving, and rule out the fat footpath of signal.
In this step, can be by receiving the signal of WCDMA system, obtaining its power-delay matrix (PDP), according to postponing matrix, search out a plurality of peaks, according to peak, rule out many footpaths and exist in a chip, rule out and have fat footpath phenomenon.
In one embodiment, for the processing procedure of step S1, can specifically comprise the steps:
Step S101: the signal of the WCDMA system of reception is carried out to filtering by matched filter, and signal after filtering and local scrambler are carried out to relevant treatment obtain power-delay matrix; Wherein, relevant treatment can comprise the coherent accumulation being undertaken by time slot or the noncoherent accumulation carrying out frame by frame, thereby can the impact on performance on antinoise.
Step S102: obtain corresponding footpath according to power-delay matrix search peak position, wherein, peak separation is at least 1chip; At 1chip, can search out all peaks.
Step S103: according to the energy threshold of setting, the power in the footpath of searched peak is adjudicated, obtain the fat footpath of described signal; Wherein, can the fat footpath ruling out be divided into one group by judging that continuous two or more footpaths spacing is that the energy in 1chip and footpath is greater than a default threshold value and adjudicates fat footpath, be used in subsequent step and process.
Step S2: according to the signal characteristic in fat footpath and auxiliary path position, the main path position in fat footpath is adjusted, obtained new main path position.
In this step, main footpath refers to the larger footpath of energy in fat footpath, auxiliary footpath refers to the footpath that energy is less, existence due to fat footpath, cause the peak in power-delay matrix to be offset, two path positions in fat footpath all can not be located accurately, accordingly, consider the signal characteristic in fat footpath, under the prerequisite of known system over-sampling rate, skew occurs peak is known quantity (as 1/2chip, 1/4chip), so can be by judging that fat footpath signal characteristic determines that peak, with respect to the side-play amount of auxiliary path position, then adjusts main path position.Above-mentionedly by signal characteristic, the main path position in fat footpath is adjusted, guaranteed the accuracy of the main path position of search.
In one embodiment, being directed to fat footpath is two situations at a distance of the footpath for 1chip of ining succession, and the processing procedure that step S2 adjusts the main path position in fat footpath can be as follows:
Main path position in fat footpath is offset to 1/4chip to the direction away from auxiliary path position.
In another embodiment, being directed to fat footpath is in succession at least three at a distance of the situation for the footpath of 1chip (being the footpath that there are three footpath close together in fat footpath), and the processing procedure that step S2 adjusts the main path position in fat footpath, can specifically comprise as follows:
Step a, calculate the energy ratio in two auxiliary footpaths in described fat footpath, and itself and default threshold value are compared; Concrete, can calculate the energy ratio in two auxiliary footpaths by formula R=α/β, in formula, α is little auxiliary footpath energy, β is large auxiliary footpath energy.
In addition, for fear of the impact in empty footpath, can delete the energy ratio R in the ，Jiang Fu footpath, auxiliary footpath that energy is less and default thresholding at this
compare, if
enter step b, if
perform step c; Generally, thresholding
value is between 0.8～0.9.
If step b energy ratio is less than or equal to default threshold value, by the main path position in fat footpath to away from the larger auxiliary footpath direction skew 1/4chip of energy.
If step c energy ratio is greater than default threshold value, by the main path position in fat footpath to away from the larger auxiliary footpath direction skew 1/2chip of energy.
Step S3: the auxiliary path position making new advances in described auxiliary footpath two-sided search according to new main path position.
In this step, can be according to the main path position of new location, the auxiliary path position making new advances in the search of both sides, described auxiliary footpath setting position.
In one embodiment, can the power-delay matrix of each 1chip position, both sides, auxiliary footpath be revised according to the main path position of location, eliminates the interference in Dui Fu footpath, main footpath, and then search for the auxiliary path position making new advances, specifically comprise as follows:
Step S301: according to new main path position, and utilize the coefficient of raised cosine filter to revise at a distance of the power-delay matrix of the position of 1chip both sides, auxiliary footpath.
Concrete, interference cancellation process is as follows: main footpath peak power P after supposing to adjust
0represent main footpath peak l after adjusting
0represent, the coefficient of raised cosine roll off filter represents with f, and the main position l that is radially offset 1/2chip away from auxiliary footpath direction of hypothesis
1/2represent, in order to resist the interference in Dui Zhu footpath, auxiliary footpath, main footpath peak value P
0=PDP (l
1/2)/f
2(| l
0-l
1/2|); The power-delay matrix position of supposing auxiliary footpath that need to revise represents with l, and revised power-delay matrix value is:
Step S302: according to revised power-delay matrix in both sides, auxiliary footpath in the scope of 1chip search peak, and the peak value searching is made as to new auxiliary path position.
So far, after above-mentioned each step process, obtain new main path position and auxiliary path position, preserve, for receiving, prepare.
Shown in figure 2, Fig. 2 is the flow chart of an algorithm examples of multipath searching method of WCDMA system; This algorithm implementation can comprise the steps:
Step S401, rated output postpones matrix, enters step S402;
Step S402, search peak position, enters step S403;
Step S403, judges whether peak value is fat footpath, if so, enters step S404, if not, enters step S411;
Step S404, judges fat footpath type, if fat footpath type is two, at a distance of being the fat footpath of 1chip, enters step S405, if fat footpath type is at least three, is apart the fat footpath of 1chip, enters step S406;
Step S405, is offset 1/4chip by main path position away from auxiliary footpath direction; Then enter step S409;
Step S406, judgement energy ratio R and default thresholding
size, if
enter step S407, if
enter step S408;
Step S407, away from auxiliary footpath direction skew 1/4chip, enters step S409 by main path position;
Step S408, away from the larger auxiliary footpath of energy direction skew 1/2chip, enters step S409 by main path position;
Step S409, according to new main path position, revise 1chip position, both sides, auxiliary footpath power-delay matrix, enter step S410;
Step S410, searches for new auxiliary path position according to revised power-delay matrix, enters step S411;
Step S411, preserves new He Fu footpath, main footpath, waits for and receiving.
The technical scheme of comprehensive above-described embodiment, by fat path position being carried out to adjustment and the interference elimination treatment in footpath, has reduced the complexity of algorithm; Secondly, according to the feature of time-delay power matrix, fat footpath is adjusted, guaranteed the accuracy of main path position; Finally, the value of local time-delay power matrix is disturbed to elimination, further guaranteed the accuracy of auxiliary path position.
Below in conjunction with accompanying drawing, the embodiment of the Multipath searching system of WCDMA system of the present invention is described in detail.
Shown in figure 3, Fig. 3 is the Multipath searching system configuration schematic diagram of the WCDMA system of an embodiment, mainly comprises:
Fat footpath judging module, for searching out peak according to the power-delay matrix of the signal of the WCDMA system receiving, and rules out the fat footpath of signal;
Main footpath adjustment module, for according to the signal characteristic in fat footpath and auxiliary path position, the main path position in fat footpath being adjusted, obtains new main path position;
Auxiliary path search module, for the auxiliary path position making new advances in described auxiliary footpath two-sided search according to new main path position.
In one embodiment, described fat footpath judging module, is further used for:
The signal of the WCDMA system of reception is carried out to filtering by matched filter, and signal after filtering and local scrambler are carried out to relevant treatment obtain power-delay matrix;
According to power-delay matrix search peak position, obtain corresponding footpath, wherein, peak separation is at least 1chip;
According to the energy threshold of setting, the power in the footpath of searched peak is adjudicated, obtain the fat footpath of described signal.
In one embodiment, described main footpath adjustment module, is further used for:
Main path position in fat footpath is offset to 1/4chip to the direction away from auxiliary path position; Wherein, described fat footpath is in succession two at a distance of being the footpath of 1chip.
In one embodiment, described main footpath adjustment module, is further used for:
Calculate the energy ratio in two auxiliary footpaths in described fat footpath, and itself and default threshold value are compared; Wherein, described fat footpath is in succession three at a distance of being the footpath of 1chip;
If energy ratio is less than or equal to default threshold value, by the main path position in fat footpath to away from the larger auxiliary footpath direction skew 1/4chip of energy;
If energy ratio is greater than default threshold value, by the main path position in fat footpath to away from the larger auxiliary footpath direction skew 1/2chip of energy.
In one embodiment, described auxiliary path search module, is further used for:
According to new main path position, and utilize the coefficient of raised cosine filter to revise at a distance of the power-delay matrix of the position of 1chip both sides, auxiliary footpath;
According to revised power-delay matrix in both sides, auxiliary footpath in the scope of 1chip search peak, and the peak value searching is made as to new auxiliary path position.
The Multipath searching system of WCDMA system of the present invention is corresponding one by one with the multipath searching method of WCDMA system of the present invention, in the embodiment of the Multipath searching system that the technical characterictic of setting forth at the embodiment of the multipath searching method of above-mentioned WCDMA system and beneficial effect thereof are all applicable to WCDMA system, statement hereby.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a multipath searching method for WCDMA system, is characterized in that, comprises the steps:
According to the power-delay matrix of the signal of the WCDMA system receiving, search out peak, and rule out the fat footpath of signal;
According to the signal characteristic in fat footpath and auxiliary path position, the main path position in fat footpath is adjusted, obtained new main path position;
The auxiliary path position making new advances in described auxiliary footpath two-sided search according to new main path position.
2. the multipath searching method of WCDMA system according to claim 1, is characterized in that, according to the power-delay matrix of the signal of the WCDMA system receiving, searches out peak, and the step that rules out the fat footpath of signal comprises:
The signal of the WCDMA system of reception is carried out to filtering by matched filter, and signal after filtering and local scrambler are carried out to relevant treatment obtain power-delay matrix;
According to power-delay matrix search peak position, obtain corresponding footpath, wherein, peak separation is at least 1chip;
According to the energy threshold of setting, the power in the footpath of searched peak is adjudicated, obtain the fat footpath of described signal.
3. the multipath searching method of WCDMA system according to claim 1, is characterized in that, the step of the main path position in fat footpath being adjusted according to the signal characteristic in fat footpath and auxiliary path position comprises:
Main path position in fat footpath is offset to 1/4chip to the direction away from auxiliary path position; Wherein, described fat footpath is in succession two at a distance of being the footpath of 1chip.
4. the multipath searching method of WCDMA system according to claim 1, is characterized in that, the step of main path position corresponding to fat footpath being adjusted according to the signal characteristic in fat footpath and corresponding auxiliary path position thereof comprises:
Calculate the energy ratio in two auxiliary footpaths in described fat footpath, and itself and default threshold value are compared; Wherein, described fat footpath is in succession three at a distance of being the footpath of 1chip;
If energy ratio is less than or equal to default threshold value, by the main path position in fat footpath to away from the larger auxiliary footpath direction skew 1/4chip of energy;
If energy ratio is greater than default threshold value, by the main path position in fat footpath to away from the larger auxiliary footpath direction skew 1/2chip of energy.
5. the multipath searching method of WCDMA system according to claim 1, is characterized in that, the step of the auxiliary path position making new advances in described auxiliary footpath two-sided search according to new main path position comprises:
According to new main path position, and utilize the coefficient of raised cosine filter to revise at a distance of the power-delay matrix of the position of 1chip both sides, auxiliary footpath;
According to revised power-delay matrix in both sides, auxiliary footpath in the scope of 1chip search peak, and the peak value searching is made as to new auxiliary path position.
6. a Multipath searching system for WCDMA system, is characterized in that, comprising:
Fat footpath judging module, for searching out peak according to the power-delay matrix of the signal of the WCDMA system receiving, and rules out the fat footpath of signal;
Main footpath adjustment module, for according to the signal characteristic in fat footpath and auxiliary path position, the main path position in fat footpath being adjusted, obtains new main path position;
Auxiliary path search module, for the auxiliary path position making new advances in described auxiliary footpath two-sided search according to new main path position.
7. the Multipath searching system of WCDMA system according to claim 6, is characterized in that, described fat footpath judging module, is further used for:
The signal of the WCDMA system of reception is carried out to filtering by matched filter, and signal after filtering and local scrambler are carried out to relevant treatment obtain power-delay matrix;
According to power-delay matrix search peak position, obtain corresponding footpath, wherein, peak separation is at least 1chip;
According to the energy threshold of setting, the power in the footpath of searched peak is adjudicated, obtain the fat footpath of described signal.
8. the Multipath searching system of WCDMA system according to claim 6, is characterized in that, described main footpath adjustment module, is further used for:
Main path position in fat footpath is offset to 1/4chip to the direction away from auxiliary path position; Wherein, described fat footpath is in succession two at a distance of being the footpath of 1chip.
9. the Multipath searching system of WCDMA system according to claim 6, is characterized in that, described main footpath adjustment module, is further used for:
Calculate the energy ratio in two auxiliary footpaths in described fat footpath, and itself and default threshold value are compared; Wherein, described fat footpath is in succession three at a distance of being the footpath of 1chip;
If energy ratio is less than or equal to default threshold value, by the main path position in fat footpath to away from the larger auxiliary footpath direction skew 1/4chip of energy;
If energy ratio is greater than default threshold value, by the main path position in fat footpath to away from the larger auxiliary footpath direction skew 1/2chip of energy.
10. the Multipath searching system of WCDMA system according to claim 6, is characterized in that, described auxiliary path search module, is further used for:
According to new main path position, and utilize the coefficient of raised cosine filter to revise at a distance of the power-delay matrix of the position of 1chip both sides, auxiliary footpath;
According to revised power-delay matrix in both sides, auxiliary footpath in the scope of 1chip search peak, and the peak value searching is made as to new auxiliary path position.
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| CN105007097A (en) * | 2015-05-29 | 2015-10-28 | 中国科学院上海微系统与信息技术研究所 | Self-adaptive multipath management method of CDMA system |
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| CN101183881A (en) * | 2007-12-11 | 2008-05-21 | 华为技术有限公司 | Multipath search method and apparatus, signal reception processing method and Rake receiver |
| CN102904605A (en) * | 2012-09-25 | 2013-01-30 | 京信通信系统（中国）有限公司 | Method and device for determining multipath information and rake receiver |
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| US20030103555A1 (en) * | 2001-11-30 | 2003-06-05 | Kyungtae Han | Apparatus for searching multipath in spread spectrum communications system and method thereof |
| CN101022280A (en) * | 2006-12-15 | 2007-08-22 | 清华大学 | Orthogonal lower mixing frequency digital template matching pulse ultra wide band radio signal receiving method |
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| CN105007097A (en) * | 2015-05-29 | 2015-10-28 | 中国科学院上海微系统与信息技术研究所 | Self-adaptive multipath management method of CDMA system |
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