CN101183881A - Multipath search method and apparatus, signal reception processing method and Rake receiver - Google Patents
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Abstract
The invention discloses a multipath searching method, as well as a receiving and processing method, a multipath searching device and a RAKE receiver for corresponding WCDMA signal, which is characterized in that the obtained path information from judgment is replenished and extended depending on the offset, and the drift of the path position is estimated and predicted by the extended additional path position. The drifting position is efficiently defined in the extended range to eliminate such as influence that the accuracy of the path information is affected by the peak value drift due to the existing fat path; the judged result of path searching is processed to extend. The invention has the advantages of no need for increasing the judge frequency, maintained low complexity of searching, and useful increase for the demodulation performance of receiving end.
Description
Technical field
The present invention relates to communication technical field, be specifically related to receiving handling method, multipath searching device and the Rake receiver of a kind of multipath searching method and corresponding wide-band code division multiple access signal.
Background technology
In radio communication, wireless signal is called as multipath from transmitting antenna through the propagation phenomenon that a plurality of paths arrive reception antenna.Because each path often has different time delays and decline, so the time diffusing effect that multipath produces can cause interference at receiving terminal.In traditional method of reseptance, usually multipath effect is handled as a kind of harmful interference, eliminate as far as possible and avoid.Yet,, also can utilize multipath effect to strengthen received signal under certain condition.When the signal delay in different paths surpasses the time time-delay of a chip (chip), can come at the signal distinguishing of receiving terminal different paths, combine after elapsed time (phase place) alignment, reach the purpose that strengthens received signal, this is the basic principle of Rake (RAKE) receiver.
At present, in Wideband Code Division Multiple Access (WCDMA) access (WCDMA:Wideband Code Division MultipleAccess) technology, promptly adopt the RAKE reception technique to carry out the reception of broadband signal.In multipath reception, an important content is that the footpath information of wireless channel is caught, and, determines path position that is, and footpath information helps guaranteeing the demodulation performance of receiving terminal accurately.
The process of Multipath searching comprises substantially among the WCDMA: received signal is obtained sampled signal after by matched filter, this sampled signal is relevant with local scrambler and obtain the correlation energy peak value by judgement, i.e. footpath delay profile (PDP:Power Delay Profile); Search for the footpath information that obtains by diameter PDP then, for guaranteeing the uncorrelated of each footpath noise, footpath interbody spacer minimum is 1 chip in the searching algorithm usually.In addition, in order to suppress noise and to obtain path position information stably, footpath PDP carries out also needing to carry out filtering before the path position judgement being used for search.
Obviously, in actual environment, footpath information becomes normally the time, and also there be the situation of footpath in a chip of many reality in wireless channel, and this paper is referred to as fat footpath with its combination.Because the effect of matched filtering, the footpath energy of each footpath sampled point can superpose in the same chip, and the decline in actual every footpath is independently, when certain bar directly declines, its the strongest energy point can drift about, then may cause the strongest whole in this chip energy point to drift about, the path position that makes judgement obtain also should change thereupon.If but PDP were carried out the variation that the filter filtering response time is slower than path position, perhaps the judgement frequency of searching algorithm would be slower, obtains the path position that path position is not current reality after then may causing adjudicating, and causes the loss of demodulation performance.
One that this paper is the strongest with energy in the distinguishable multipath of receiving terminal is called main footpath, illustrates the problems referred to above with main footpath for the situation in fat footpath below.With reference to figure 1, suppose to have the main footpath that constitutes by two footpaths in the chip, be respectively son footpath 1 and son footpath 2.In the moment shown in Fig. 1 left side, directly 1 peak value is bigger owing to son, and the peak after the stack of chip self-energy is directly 1 peak of son, and therefore, the main path position that carries out position judgement acquisition should be in the A point; But if the response time of filter or judgement frequency are slower than the decay time in son footpath 1, then when making the judgement of " main path position is in the A point ", but energon footpath 1 has declined and has been the situation shown in Fig. 1 right side, at this moment, peak after the stack of chip self-energy should be positioned on the B point, and promptly Ci Shi main path position should be in B, and the court verdict of this moment is A, this path position is followed the tracks of untimely phenomenon and has been caused the path position that searches inaccurate, thereby causes demodulation performance to worsen.Obviously, the actual footpath number in chip is many more, and the speed of its peak shift also may be fast more.
At present, for a kind of method that accuracy adopted that improves the footpath judgement is to use quick path position decision algorithm, improves the footpath and adjudicate frequency.Though the present inventor finds that in to the research of prior art and practice process judgement fast can make the footpath information of acquisition better follow the tracks of actual footpath to a certain extent and change, obviously complexity is higher.
Summary of the invention
The embodiment of the invention is provided under the situation that does not increase the judgement frequency, overcomes the multipath searching method of path position drift diameter information accuracy influence, and receiving handling method, multipath searching device and the RAKE receiver of corresponding WCDMA signal.
A kind of multipath searching method comprises: obtain to carry out the one or more path position that the path position judgement obtains according to the footpath delay profile; At least one described path position is carried out forward direction and/or back to skew according to side-play amount, obtain the additional path position of this path position; The additional path position that path position that the judgement of described path position is obtained and described skew obtain is exported as footpath information.
A kind of receiving handling method of WCDMA signal comprises: the broadband signal that receives is carried out matched filtering; Calculate the footpath delay profile of the sampled signal that obtains after the matched filtering; According to described footpath delay profile, obtain footpath information according to aforementioned multipath searching method; Separate and despreading according to the sampled signal that described footpath information obtains after to matched filtering, and proofread and correct and merge according to the time-delay in each footpath.
A kind of multipath searching device comprises: the path search unit, be used for carrying out the path position judgement according to the footpath delay profile of input, and generate one or more path position; The footpath expanding element, at least one path position that is used for described path search unit is generated carries out forward direction and/or back to skew according to side-play amount, generates the additional path position of this path position; Output unit is used for output footpath information, and described footpath information comprises the path position of described path search unit generation and the additional path position that described footpath expanding element generates.
A kind of RAKE receiver comprises: the Multipath searching module, adopt the structure of aforementioned multipath searching device; Signal processing module is used for according to the footpath information of described Multipath searching module output the received signal of input being carried out despreading and being separated.
The embodiment of the invention adopts the footpath information that judgement is obtained according to side-play amount to replenish the method for expansion, additional path position by expansion is estimated the drift of path position and is predicted, can be effectively the position of drift be confined within the scope of expansion, for example to overcome the influence of the peak shift diameter information accuracy that produces owing to reasons such as having fat footpath.
Description of drawings
Fig. 1 is existing a kind of main footpath peak shift schematic diagram;
Fig. 2 is the multipath searching method basic procedure schematic diagram of the embodiment of the invention;
Fig. 3 is a kind of footpath information schematic diagram that the multipath searching method of the embodiment of the invention obtains;
Fig. 4 is the receiving handling method schematic flow sheet of the WCDMA signal of the embodiment of the invention;
Fig. 5 is the basic logical structure schematic diagram of the multipath searching device of the embodiment of the invention;
Fig. 6 is the basic logical structure schematic diagram of the RAKE receiver of the embodiment of the invention;
Fig. 7 is the simulation result figure of the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of multipath searching method, according to side-play amount the footpath information that judgement obtains is replenished expansion.The embodiment of the invention also provides receiving handling method, multipath searching device and the RAKE receiver of corresponding WCDMA signal.Below be elaborated respectively.
With reference to figure 2, the multipath searching method of the embodiment of the invention mainly comprises step:
A1, acquisition are carried out the one or more path position that the path position judgement obtains according to the footpath delay profile.
The path position judging process specifically can use existing various Multipath searching algorithm, for example linear search method, unit saltus step search method, search method, bit reversal search method etc. by half, and present embodiment does not limit this.
A2, the path position that at least one judgement is obtained carry out forward direction and/or back to skew according to side-play amount, obtain the additional path position of this path position.
The path position that need be offset can be all, can be at random, can determine according to the importance in footpath, also can obtain by judging based on the selection of certain condition.In actual applications, according to the characteristics of concrete channel, can comprise following two kinds of situations:
1. the footpath in the channel can take place to drift about fast usually, for example, is a kind of normality because the characteristics of channel itself cause occurring fat footpath.
In this case, the path position that obtains of the judgement possibility that influenced by fat footpath is bigger.Therefore, can all expand, certainly, also can only expand the part path position to whole path positions that judgement obtains.For different path positions, can also select respectively forward direction, back to, simultaneously forward direction and back to etc. different mode of extensions.In view of main footpath energy is the highest, the accuracy of its path position is particularly important, if only the part path position is expanded, main footpath can be included in the scope that need expand; Even, also can only expand the path position in main footpath.
2. fat footpath may occur in the channel, but be not a kind of normality.
In this case, can determine to meet the path position of fat footpath condition earlier, the path position that not influenced by fat footpath considers no longer that then concrete steps are:
A. from the path position that the path position judgement obtains, select to meet the path position of fat footpath condition;
A kind of optional selection mode is, judges according to the footpath delay profile in the length of a chip before or after this path position, whether has the position with other energy peaks, if then this path position is considered as a path position that meets fat footpath condition; Another kind of determine that optionally mode is, judge according to the footpath delay profile in the length of a chip before or after this path position, whether have the position that has above the energy of threshold value, if then this path position is considered as a path position that meets fat footpath condition; Concrete judgment mode can be formulated according to actual conditions, and present embodiment does not limit.
Certainly,, consider the importance of main path position simultaneously, when selecting to meet the path position of fat footpath condition, also can be only whether main path position or the part path position that comprises main path position be met fat footpath condition and judge for for simplicity.
B. at least one path position that meets fat footpath condition is carried out forward direction and/or back to skew according to side-play amount.
Similar in 1. with situation, can all expand determining the whole path positions that meet fat footpath condition, also can only expand the part path position.For different path positions, can also select respectively forward direction, back to, simultaneously forward direction and back to etc. different mode of extensions.
In above-mentioned various situations, being offset employed side-play amount can be the fixed value that presets, and also can design the dynamically algorithm of value according to actual application environment, carries out adaptive adjustment.And, the only expansion forward or backward of additional path position, expansion quantity can be for one or more.Certainly,, also can carry out forward direction and back simultaneously, obtain to be expanded two additional path positions of path position to skew for obtaining the better prediction scope.
The footpath interbody spacer minimum that judgement obtains based on path position is a chip, can select side-play amount to be set to the length of a chip.Yu Ce additional path position promptly is fixed on the position of adjudicating the other chip of path position that obtains like this, the value of setting of this side-play amount can satisfy the needs of fat footpath peak shift, effective estimation range is provided, when the path position of reality is consistent with the additional path position of expansion, can realize accurately catching of footpath information.
The footpath information output that the additional path position that A3, the path position that path position judgement is obtained and skew obtain obtains as search.
Such situation may appear after considering the additional path position of increase, promptly, distance between the path position that additional path position and judgement obtain is less than the length of a chip, this in actual applications, normally unsuitable, therefore, when the path position that judgement is obtained and the additional path position that obtains of skew are merged into footpath information, can also further carry out following operation: judge that additional path position and path position adjudicate distance between the path position that obtains whether less than the length of a chip, if then the corresponding additional path position of cancellation then keeps additional path position if not.All be positioned at different chips with each path position in the footpath information of guaranteeing to export.
Certainly, suppress noise and obtain stably purpose such as path position information for reaching, further the footpath delay profile that can also use Alpha (alpha) filter that needs are searched for earlier carries out filtering; And then carry out path position according to the filtered footpath of alpha delay profile and adjudicate.
Above-mentioned multipath searching method replenishes the method for expansion by the footpath information that judgement is obtained, additional path position by expansion is estimated the drift of path position and is predicted, can be effectively the position of drift be confined within the scope of expansion, for example to overcome the influence of the peak shift diameter information accuracy that produces owing to reasons such as having fat footpath; Owing to be that the court verdict of path search is expanded, therefore the present embodiment multipath searching method is under the prerequisite of the frequency that does not increase the path position judgement searching algorithm that uses, improved the accuracy of footpath information, the low complex degree that can keep path search can cooperate with various existing Multipath searching algorithms and improve its performance.
For better understanding the foregoing description, illustrate as follows.A chip of assumed wireless channel comprises 4 sampled points, and actual footpath information is that { 8,10,11,14} sampling point, preceding 3 sampling points in a chip aforementioned fat footpath effect can take place.If footpath judging process search obtains 2 footpaths, lay respectively at 8 and 14, wherein 8 is main path position, then the additional path position in the main footpath of prediction is that position forward direction and back are adjudicated to the position of a chip in current main footpath, promptly 4 and 12; Thus, being positioned on the basis, 8 and 14 2 footpaths that judgement obtains, increasing and be positioned at each footpath of 4 and 12, to guarantee that the footpath is arranged all the time on possible position; In addition, further judge distance between the path position 14 that the additional path position 12 that increases and judgement obtain less than the length of a chip, the therefore additional path position 12 of cancellation, the footpath information of final output is wherein added path position and is represented by dotted lines as shown in Figure 3.
Above-mentioned multipath searching method can be applicable to the WCDMA system.In the WCDMA system, the speed of chip can reach 3.84Mbps, and this makes multidiameter delay resolution very high, so system can well utilize multipath information to improve receptivity.Below the receiving handling method based on the WCDMA signal of the embodiment of the invention of above-mentioned multipath searching method is described.With reference to figure 4, mainly comprise step:
B1, the broadband signal that receives is carried out matched filtering.
In the WCDMA system, transmitting terminal can carry out molding filtration (for example root raised cosine molding filtration) to sending signal usually, so also can be to a corresponding matched filtering should be arranged when receiving.
The footpath delay profile of the sampled signal that obtains after B2, the calculating matched filtering.
The judgement of footpath delay profile generates and can carry out with reference to existing mode, for example sampled signal and local scrambler is carried out relevantly, obtains the peak Distribution of correlation energy by judgement, i.e. PDP directly.Certainly, can comprise that also diameter PDP carries out processes such as alpha filtering, obtain the filtered footpath PDP that is used for the path position search.
B3, according to the multipath searching method of previous embodiment, obtain footpath information according to the footpath delay profile;
Comprise the path position that obtains by the Multipath searching algorithmic decision in this footpath information, and all or part of path position is offset the additional path position that obtains.
B4, the sampled signal that obtains after to matched filtering according to the footpath information that obtains are separated and despreading, and proofread and correct and merge according to the time-delay in each footpath.
This part operation can be carried out with reference to existing multipath reception processing method.
The receiving handling method of present embodiment WCDMA signal, based on aforementioned multipath searching method, can be under the prerequisite that does not increase implementation complexity, in the fast-changing scene of one or several chip inner diameter location, overcome the influence of fat footpath diameter information accuracy, guaranteed the receiving demodulation performance.
Below multipath searching device and RAKE receiver based on the embodiment of the invention of aforementioned multipath searching method are described.
With reference to figure 5, the multipath searching device of the embodiment of the invention mainly comprises:
Footpath expanding element 102, at least one path position that is used for 101 generations of diameter search unit carries out forward direction and/or back to skew according to side-play amount, generates the additional path position of this path position;
Further, corresponding in the aforementioned searching method to the selection of the path position that satisfies fat footpath condition, footpath expanding element 102 specifically can comprise:
Chooser unit 1021, the path positions that are used for 101 generations from the path search unit select to meet the path position of fat footpath condition;
Further, corresponding in the aforementioned searching method to the screening of additional path position, output unit 103 specifically can comprise:
In addition, the present embodiment multipath searching device also can further comprise:
Alpha's filter unit 104 is used for the footpath delay profile of input is carried out Alpha's filtering, and filtered footpath delay profile is exported to path search unit 101.
With reference to figure 6, the RAKE receiver of the embodiment of the invention mainly comprises:
Multipath searching module 201 is used for carrying out the path position judgement according to the footpath delay profile of input, generates one or more path position; The path position that at least one judgement is obtained carries out forward direction and/or back to skew according to side-play amount, obtains the additional path position of this path position; Path position judgement path position that obtains and the additional path position that skew obtains are exported as the footpath information that search obtains;
The Multipath searching module of the RAKE receiver of present embodiment specifically can adopt the structure of above-mentioned multipath searching device.
For the beneficial effect of the embodiment of the invention better is described, it is as follows to carry out emulation experiment: adopt 3GPP protocol channels ITU Pedestrian A Speed 3km/h (PA3) channel, the footpath delay profile of channel is (0ns, 110ns, 190ns, 410ns), because WCDMA physical layer spreading rate is 3.84Mchip/s, then chip duration is 260ns, so there is fat footpath situation in this channel.On this channel, adopt respectively and do not adopt embodiment of the invention scheme to carry out signal and receive, experimental result as shown in Figure 7, block curve is for adopting the performance curve of embodiment of the invention scheme among Fig. 7, and dashed curve is not for adopting the performance curve of embodiment of the invention scheme; As seen from Figure 7, embodiment of the invention scheme has useful lifting to the demodulation performance of receiving terminal.
One of ordinary skill in the art will appreciate that all or part of step in the whole bag of tricks of the foregoing description is to instruct relevant hardware to finish by program, this program can be stored in the computer-readable recording medium, and storage medium can comprise: ROM, RAM, disk or CD etc.
More than receiving handling method, multipath searching device and the RAKE receiver of multipath searching method that the embodiment of the invention provided and corresponding WCDMA signal is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (15)
1. a multipath searching method is characterized in that, comprising:
Acquisition is carried out the one or more path position that the path position judgement obtains according to the footpath delay profile;
At least one described path position is carried out forward direction and/or back to skew according to side-play amount, obtain the additional path position of this path position;
The additional path position that path position that the judgement of described path position is obtained and described skew obtain is exported as footpath information.
2. multipath searching method according to claim 1 is characterized in that, described at least one path position according to side-play amount carry out forward direction and/or the back be specially to skew:
The main path position that judgement obtains to path position carries out forward direction and/or back to skew according to side-play amount.
3. multipath searching method according to claim 1 is characterized in that, described at least one path position according to side-play amount carry out forward direction and/or the back to the skew step comprise:
From the path position that the path position judgement obtains, select to meet the path position of fat footpath condition;
At least one path position that meets fat footpath condition is carried out forward direction and/or back to skew according to side-play amount.
4. multipath searching method according to claim 3 is characterized in that, the described path position of selecting to meet fat footpath condition from the path position that the path position judgement obtains is specially:
Judge whether the main path position that the judgement of described path position obtains meets fat footpath condition, if then with described main path position as the described path position that meets fat footpath condition.
5. multipath searching method according to claim 3 is characterized in that, the path position that described selection meets fat footpath condition is specially:
Judge according to described footpath delay profile in the length of a chip before or after this path position, whether have position, if then select this path position as the described path position that meets fat footpath condition with other energy peaks; Perhaps, whether there is the position that has above the energy of threshold value, if then select this path position as the described path position that meets fat footpath condition.
6. multipath searching method according to claim 1 is characterized in that:
Described side-play amount is the length of a chip.
7. according to any described multipath searching method of claim 1～6, it is characterized in that, described to path position according to side-play amount carry out forward direction and/or the back be specially to skew:
Path position is carried out forward direction and back to skew according to side-play amount, obtain two additional path positions of this path position.
8. according to any described multipath searching method of claim 1～6, it is characterized in that, after being offset the additional path position of acquisition, also comprise:
Judge distance between the path position that obtains of described additional path position and path position judgement whether less than the length of a chip, if the corresponding additional path position of cancellation then then keeps additional path position if not.
9. according to any described multipath searching method of claim 1～6, it is characterized in that, also comprise:
Use Alpha's filter that the footpath delay profile of needs search is carried out filtering;
Carry out described path position judgement according to described filtered footpath delay profile.
10. the receiving handling method of a wide-band code division multiple access signal is characterized in that, comprising:
The broadband signal that receives is carried out matched filtering;
Calculate the footpath delay profile of the sampled signal that obtains after the matched filtering;
According to described footpath delay profile, obtain footpath information according to any described multipath searching method of claim 1～9;
Separate and despreading according to the sampled signal that described footpath information obtains after to matched filtering, and proofread and correct and merge according to the time-delay in each footpath.
11. a multipath searching device is characterized in that, comprising:
The path search unit is used for carrying out the path position judgement according to the footpath delay profile of input, generates one or more path position;
The footpath expanding element, at least one path position that is used for described path search unit is generated carries out forward direction and/or back to skew according to side-play amount, generates the additional path position of this path position;
Output unit is used for output footpath information, and described footpath information comprises the path position of described path search unit generation and the additional path position that described footpath expanding element generates.
12. multipath searching device according to claim 11 is characterized in that, described footpath expanding element comprises:
The chooser unit, the path position that is used for generating from described path search unit selects to meet the path position of fat footpath condition;
The expansion subelement is used at least one path position that meets fat footpath condition is carried out forward direction and/or back to skew according to side-play amount.
13. multipath searching device according to claim 11 is characterized in that, described output unit comprises:
Judgment sub-unit, be used to judge that distance between the path position of additional path position that described footpath expanding element generates and the generation of described path search unit is whether less than the length of a chip, if then corresponding additional path position in the information of cancellation footpath then keeps the additional path position in the information of footpath if not;
The output subelement is used to export the footpath information after described judgment sub-unit is handled.
14. according to any described multipath searching device of claim 11～13, it is characterized in that, also comprise:
Alpha's filter unit is used for the footpath delay profile of input is carried out Alpha's filtering, and filtered footpath delay profile is exported to described path search unit.
15. a Rake receiver is characterized in that, comprising:
The Multipath searching module, the structure of any described multipath searching device of employing claim 11～14;
Signal processing module is used for according to the footpath information of described Multipath searching module output the received signal of input being carried out despreading and being separated.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011012031A1 (en) * | 2009-07-30 | 2011-02-03 | 中兴通讯股份有限公司 | Method and receiver for data reception in cdma communication system |
| CN101610099B (en) * | 2009-07-21 | 2012-11-21 | 华为终端有限公司 | Method, device and receiving system for realizing multi-path search |
| CN103595443A (en) * | 2013-11-15 | 2014-02-19 | 京信通信系统（中国）有限公司 | Multi-path searching method and system of WCDMA system |
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| AU2003296211A1 (en) * | 2003-12-26 | 2005-07-21 | Zte Corporation | Multi-path search method of code-division multiple-access system |
| CN100373795C (en) * | 2005-05-26 | 2008-03-05 | 北京北方烽火科技有限公司 | Multi-path tracing method for WCDMA upstream special link-circuit |
| CN100459445C (en) * | 2005-09-18 | 2009-02-04 | 华为技术有限公司 | Method, apparatus and receiving apparatus for multi-path searching |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101610099B (en) * | 2009-07-21 | 2012-11-21 | 华为终端有限公司 | Method, device and receiving system for realizing multi-path search |
| WO2011012031A1 (en) * | 2009-07-30 | 2011-02-03 | 中兴通讯股份有限公司 | Method and receiver for data reception in cdma communication system |
| CN103595443A (en) * | 2013-11-15 | 2014-02-19 | 京信通信系统（中国）有限公司 | Multi-path searching method and system of WCDMA system |
| CN103595443B (en) * | 2013-11-15 | 2016-02-10 | 京信通信系统（中国）有限公司 | The multipath searching method of WCDMA system and system |
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