CN101123462A - A multi-path search value interposition method for direct frequency spreading code division multi-address system - Google Patents
A multi-path search value interposition method for direct frequency spreading code division multi-address system Download PDFInfo
- Publication number
- CN101123462A CN101123462A CNA2007101459768A CN200710145976A CN101123462A CN 101123462 A CN101123462 A CN 101123462A CN A2007101459768 A CNA2007101459768 A CN A2007101459768A CN 200710145976 A CN200710145976 A CN 200710145976A CN 101123462 A CN101123462 A CN 101123462A
- Authority
- CN
- China
- Prior art keywords
- time delay
- delay profile
- amplitude time
- peak
- footpath
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention discloses a multipath interpolation search method of a direct spread spectrum code division multiple access system. In the multipath search process, peak position of the peak amplitude time lag outline which is twice of the sampling precision is interpolated based on early, medium and late way theory. Interference of dense adjacent paths of the peak amplitude time lag outline is eliminated once or time after time, and peak positions of the dense adjacent paths of the peak amplitude time lag outline are interpolated based on the early, medium and late way theory until the amplitude time lag outline which is eight times or more of the sampling precision after inference of adjacent paths is completely eliminated is found out. By adopting the invention, ADP can be interpolated; accurate multipath positions can be got; interference of dense paths can be resisted effectively; and low complexity can be achieved.
Description
Technical field
The present invention relates to the wireless mobile communications field, relate in particular to a kind of Multipath searching interpolation method of Direct-Spread code division multiple access system.
Background technology
In the Direct-Spread code division multiple access system, the wireless interface receiving end is correlated with the recovering information symbol with chip sequence, uses the pilot signal in the Dedicated Physical Control Channel to estimate multidiameter delay at present usually.Do different delay relevant with known scrambler with pilot signal with the baseband signal that receives, obtain a correlation function.When relevant time-delay was identical with the time-delay in footpath, a peak value will appear in correlation function, and correlation function is with respect to the peak value symmetry, as shown in Figure 1.In the correlation function waveform, seek the time delay that the pairing time delay of peak value is exactly each footpath.
Under the actual conditions in the time of two footpaths adjacent closer (less than 1.5 chips), just might cause correlation function to change owing to the stack of signal, skew appears in peak value, as Fig. 2 is exactly ADP (Amplitude Delay Profile, amplitude time delay profile) after the multipath stack that is 1 chip of two distances.As can be seen from the figure, the peak value in footpath 1 is offset, and the peak value in weak footpath is covered by strong footpath.Adopt common multipath searching method can't find real multi-path location accurately in this case, need to seek better solution.
In the spread spectrum code division multiple access system, have two class methods to improve the Multipath searching precision at present usually: first kind method improves the Multipath searching precision by the method for multipath interpolation, adopts the system as Fig. 3.Fig. 3 is a kind of structural representation block diagram of Rake receiver, comprises multipath, path combiner, demodulator.Baseband signal is delivered to respectively in multipath and L the demodulator.Multipath carries out the coupling correlation intergal of different delay to baseband signal with local scrambler, obtain twice chip accuracy A DP, carry out peak value judgement back and the multipath peak phase is carried out processing such as interpolation, improve its precision (can reach 1/8 chip or higher), offer each demodulator respectively as final multipath.Demodulator carries out the demodulation of data, and demodulation result is delivered to the path combiner merges according to each the footpath time delay that obtains, and exports then.
Another kind of method is to improve the Multipath searching precision by the multipath tracking device, adopts the system as Fig. 4.Fig. 4 is the structural representation block diagram of another kind of Rake receiver, comprises multipath, path combiner, demodulator, multipath tracking device.Baseband signal is delivered to respectively in multipath and L the demodulator.Multipath carries out the coupling correlation intergal of different delay with local scrambler to baseband signal, obtains twice chip accuracy A DP, carries out obtaining L multipath after peak value is judged, offers L demodulator and L multipath tracking device.The multipath tracking device carries out morning, noon and afternoon road (EOL:Early, On-time, Late) energy to every multipath respectively and calculates, and obtains L multi-path location adjustment information of 8 times of chip precision according to each bar footpath EOL energy result, and this information is sent to demodulator.Demodulator is adjusted the multipath delay of 2 times of chip precision and is carried out demodulation according to the EOL adjustment information of 8 times of chip precision, the result of every multi-path demodulation will deliver to the path combiner and merge, and export then.
Contrast above two kinds of methods, its quality is respectively arranged, first kind method realizes simple, but lack the ripe multipath interpolation algorithm that can guarantee precision and accurate row, a kind of as having provided in the patent application " code division multiple access system Multipath searching interpolation method " (publication number CN1529440) according to the multipath interpolation method of ADP in conjunction with the EOL principle, but this method can't solve the problem that the phase mutual interference of multi-path dense (at interval less than 1.5 chips) causes the ADP peakdeviation; The hardware resource that described another kind of method needs is more, having increased a functional module and complex interfaces degree improves, system cost is too high, but there is the multipath tracking algorithm of comparative maturity to be used for guaranteeing the multipath tracking precision, " a kind of up link multi-path tracing method that is used for Wideband Code Division Multiple Access (WCDMA) (WCDMA) system " (publication number CN1461118) provided a kind of improved multi-path tracing method as patent, this method is judged the distance of two multipaths, if its distance is less than certain value, then from the EOL energy in every footpath, eliminate the influence in another footpath, thereby improved final multipath tracking precision.
In a word, existing method or consume more hardware resource (need special multipath tracking device), or can't eliminate the interference between multi-path dense.
Summary of the invention
The invention provides a kind of Multipath searching interpolation method of Direct-Spread code division multiple access system, solving or to consume more hardware resource (needing special multipath tracking device), or can't eliminate the problem of the interference between multi-path dense.
In order to solve the problems of the technologies described above, the invention provides a kind of Multipath searching interpolation method of Direct-Spread code division multiple access system, in the Multipath searching process, the peak amplitude time delay profile of 2 samplings is carried out peak interpolation based on morning, noon and afternoon road principle, wherein, there is the peak amplitude time delay profile in intensive adjacent footpath for those, carry out intensive adjacent footpath interference eliminated of one or many and described peak interpolation operation, up to finding 8 times or the amplitude time delay profile of eliminating fully after disturb in adjacent footpath of above sampling precision based on morning, noon and afternoon road principle.
The method of the invention wherein, for those peak amplitude time delay profiles that does not have intensive adjacent footpath, is directly carried out the amplitude time delay profile that described peak interpolation based on morning, noon and afternoon road principle obtains 8 times or above sampling precision.
The method of the invention, wherein, the described peak amplitude time delay profile that does not have an intensive adjacent footpath is meant and does not exist around this amplitude time delay profile with it spacing less than the peak amplitude time delay profile of 1.5 chips; The described peak amplitude time delay profile that has an intensive adjacent footpath is meant and exists around this amplitude time delay profile with it spacing less than the peak amplitude time delay profile of 1.5 chips.
Further, described method comprises the steps:
(1) described multipath is done the computing of different delay with the baseband signal that receives and local scrambler and pilot tone, and the function that obtains is the amplitude time delay profile, and this amplitude time delay profile is 2 sampling precision;
(2) described multipath is provided with amplitude time delay profile noise gate, and carries out peak value and select, and obtains the set of peak amplitude time delay profile;
(3) described multipath decomposes peak amplitude time delay profile set, be divided into an independent footpath amplitude time delay profile set, the amplitude time delay profile S set 0 that does not promptly have intensive adjacent footpath, with N intensive footpath amplitude time delay profile S set 1...Sj...SN, wherein, N＞=0, what comprise in each intensive footpath amplitude time delay profile set is exactly the cluster amplitude time delay profile of neighbor distance less than 1.5 chips;
(4) described multipath carries out described peak interpolation based on morning, noon and afternoon road principle to each the peak amplitude time delay profile in the independent footpath amplitude time delay profile S set 0, obtains the amplitude time delay profile of 8 times or above sampling precision;
(5) if there is the amplitude time delay profile set of intensive footpath, then described multipath carries out one or many intensive footpath interference eliminated and described peak interpolation based on morning, noon and afternoon road principle to the peak amplitude time delay profile among each S set j, wherein, 1＜=j＜=N handles until the amplitude time delay profile that finds 8 times or above sampling precision and all intensive footpath amplitude time delay profile set.
Further, as finding 8 sampling accuracy A DP, described method comprises the steps: in the step (5)
(5.1) suppose intensive footpath amplitude time delay profile ADP S set j={ADP1, ADP2, ... ADPM}, wherein, 1＜=j＜=N, N are intensive footpath amplitude time delay profile set number, and suppose with 8 sampling accuracy representings, described 8 sampling precision obtain like this: near the amplitude time delay profile ADP1 to the ADPM position is carried out the linear interpolation operation, obtain the amplitude time delay profile of 1/8 chip precision, be designated as ADP8times;
(5.2) described each peak amplitude time delay profile is eliminated the operation that disturb in adjacent intensive footpath: for example for ADP1, from ADP8times, cut the relevant peaks energy of other amplitude time delay profile peak values except that ADP1, the amplitude time delay profile that other intensive footpaths disturb is eliminated, be designated as ADP8times1, with it as input to the peak interpolation of ADP1; Similarly, obtain the amplitude time delay profile of other intensive footpaths interference of elimination of ADP2...ADPM, be designated as ADP8times2 respectively ... ADP8timesM;
(5.3) successively to described ADP8times1, ADP8times2 ... ADP8timesM carries out described peak interpolation operation based on morning, noon and afternoon road principle;
(5.4) if the result of described interpolation based on morning, noon and afternoon road principle shows certain peak value among the Sj has been carried out the position adjustment, then preserved adjusted amplitude time delay profile in Sj, forwarded step (5.2) then to and continue to carry out; The peak value among the Sj is not carried out the position adjustment if show based on the result of the interpolation of morning, noon and afternoon road principle, then current S set j handles, forward step (5.1) to other intensive footpath amplitude time delay profile S set j are carried out above-mentioned processing, all handle up to described intensive footpath amplitude time delay profile S set j.
Further, in the step (5.2), the relevant peaks energy of described other amplitude time delay profile peak values obtains according to desirable peak curve.
Further, in the step (5.1), described amplitude time delay profile is according to delay positions sequence arrangement from small to large.
Further, in the step (5.1), use finite impulse response filter that near the amplitude time delay profile ADP1 to the ADPM position is carried out the linear interpolation operation.
Adopt the method for the invention, compared with prior art, have the following advantages:
1) when having multi-path dense, can find the position of every multipath accurately, the multi-path location skew of avoiding the multipath interference to cause, thus distinguish multi-path demodulation position accurately;
2) do not increase special multipath tracking device, reduced system complexity.
Description of drawings
Fig. 1 is the waveform schematic diagram of the relevant time-delay of prior art correlation function when identical with time-delay directly;
Fig. 2 is a prior art multi-path dense phase mutual interference schematic diagram;
Fig. 3 is the Rake receiver structural representation block diagram that prior art does not adopt the multipath tracking device;
Fig. 4 is the Rake receiver structural representation block diagram that prior art adopts the multipath tracking device;
Fig. 5 is a Multipath searching interpolation method flow chart in the example Direct-Spread code division multiple access system of the present invention;
Fig. 6 application example of the present invention carries out the result schematic diagram of interference eliminated and multipath interpolation for the first time;
Fig. 7 application example of the present invention carries out the result schematic diagram of interference eliminated and multipath interpolation for the second time;
Fig. 8 application example of the present invention carries out the result schematic diagram of interference eliminated and multipath interpolation for the third time;
Fig. 9 is the result schematic diagram that prior art does not carry out carrying out under the interference eliminated situation multipath interpolation.
Embodiment
Multipath of the present invention is in the Multipath searching process, the peak A DP of 2 samplings is carried out peak interpolation based on morning, noon and afternoon road principle, for those peak A DP (promptly do not exist around this ADP spacing less than the peak A DP of 1.5 chips) with it that does not have intensive adjacent footpath, directly carry out the ADP that peak interpolation based on morning, noon and afternoon road principle obtains 8 times or above sampling precision; For the peak A DP that has intensive adjacent footpath around those (promptly exist around this ADP spacing less than the peak A DP of 1.5 chips) with it, carry out the intensive adjacent footpath interference eliminated of one or many and based on the peak interpolation operation of morning, noon and afternoon road principle, up to finding 8 times or the ADP of above sampling precision that eliminates fully after disturb in adjacent footpath.
Wherein, morning, noon and afternoon road principle is based on the character of scrambler auto-correlation function about the multi-path location symmetry, and promptly this function is the even function with respect to multi-path location, as shown in Figure 1.In the ideal case, the center of scrambler auto-correlation function is separated adjusted position (or demodulation phase) and is aimed at actual multi-path location is strict, therefore after handling through the scrambler auto-correlation function, this locational demodulation energy value maximum, and the center of being symmetrically distributed in is separated the locational demodulation energy of the demodulation of adjusted position both sides and must be equated.Adjusted position is separated at the center be called the Zhong Lu position, and will be early than being called early position, road and position, late road with the adjusted position of separating that is later than the Zhong Lu position.Separate adjusted position if the Zhong Lu position is departed from the center of auto-correlation function ideally forward, then early the demodulation energy of position, road will be greater than the locational demodulation energy in late road.This shows,, can determine the phase relation of Zhong Lu position and actual multi-path location and move a sign indicating number correlation function in view of the above, make the multi-path location of its center demodulation position alignment reality as far as possible by the relative size of judgement position, road energy morning and position, late road energy.
To achieve these goals, Multipath searching interpolation method in the embodiment of the invention Direct-Spread code division multiple access system may further comprise the steps:
The first step is done the related operation of different delay with the baseband signal that receives and local scrambler and pilot tone, obtains a correlation function, is referred to as ADP, and this ADP is 2 sampling precision;
Second step was provided with the ADP noise gate, and carried out peak value and select, and obtained peak A DP set;
The 3rd step, set is decomposed to peak A DP, is divided into an independent footpath ADP set, does not promptly have the ADP S set 0 in intensive adjacent footpath, with N (N＞=0) intensive footpath ADP S set 1...Sj...SN, that comprise in each intensive footpath ADP set is exactly the cluster ADP of neighbor distance less than 1.5 chips;
The 4th step, each the peak A DP in the independent footpath ADP S set 0 is carried out the peak interpolation, interpolation method is based on morning, noon and afternoon road principle;
The 5th step, if there is intensive footpath ADP set, then each set (S1...Sj...SN) was carried out for the 6th step successively, if all intensive footpath ADP set are all handled, then finish;
The 6th step, to intensive footpath ADP S set j (the peak A DP among 1＜=j＜=N) carries out intensive footpath interference eliminated and peak interpolation, and concrete method is as follows:
(1) suppose Sj={ADP1, ADP2 ... ADPM}, wherein ADP is according to delay positions sequence arrangement from small to large, and hypothesis is with 8 sampling accuracy representings.Near ADP1 to the ADPM position ADP is carried out linear interpolation operation (using FIR (Finite Impulse Response, finite impulse response) filter), obtain 1/8chip accuracy A DP, be designated as ADP8times;
(2) each peak A DP is eliminated the operation that disturb in adjacent intensive footpath.For example for ADP1, other ADP peak values that cut from ADP8times except that ADP1 (are ADP2, ... relevant peaks energy ADPM) (can obtain) according to desirable peak curve, the ADP that other intensive footpaths disturb is eliminated, be designated as ADP8times1, will be as input to the peak interpolation of ADP1; Similarly, obtain the ADP of other intensive footpaths interference of elimination of ADP2...ADPM, be designated as ADP8times2 respectively ... ADP8timesM;
(3) successively to ADP8times1, ADP8times2 ... ADP8timesM carries out the peak interpolation operation based on morning, noon and afternoon road principle, concrete grammar with the 4th the step in identical;
(4) if show based on the result of the interpolation of morning, noon and afternoon road principle certain peak value among the Sj has been carried out the position adjustment, then preserve adjusted ADP in Sj, forward (2) then to and continue to carry out.If show based on the result of the interpolation of morning, noon and afternoon road principle and the peak value among the Sj not carried out the position adjustment, illustrate that then current S set j handles, and forwards for the 5th step to.
Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is described in detail.
As shown in Figure 5, Multipath searching interpolation method flow process in the example Direct-Spread code division multiple access system of the present invention comprises the steps:
Step 501, multipath is done the related operation of different delay with the baseband signal that receives and local scrambler and pilot tone, obtains multipath ADP, and this ADP is 2 sampling precision;
Step 502, be provided with the ADP noise gate (method selected of noise gate is very many, and its principle is that threshold value is taken as noise ADP average and adds n noise ADP variance doubly, n=2..4 wherein, n is big more to mean that the false alarm probability of multipath searching is low more.When specific implementation, the technology of the present invention those skilled in the art can adopt the method for dynamic setting thresholding or fixed threshold as the case may be), carry out peak value then and select, obtain peak A DP set, promptly have the set of the ADP position of potential multipath peak value, concrete system of selection is:
(502.1) search maximum ADP among the current multipath ADP, be designated as ADPpeak,, otherwise finish the peak value selection course if ADPpeak, then preserves this ADPpeak greater than noise gate in peak A DP set;
(502.2) from current multipath ADP the deletion ADPpeak and about two locational ADP of 1/2chip; Continue to carry out (502.1).
Step 503, set is decomposed to peak A DP, be divided into an independent footpath ADP set, the ADP S set 0 that does not promptly have intensive adjacent footpath, with N (N＞=0) intensive footpath ADP S set 1...Sj...SN, comprise in each intensive footpath ADP set be exactly before and after adjacent peak separation from cluster ADP less than 1.5 chips, specifically decomposable process is as follows:
(503.1) peak A DP set is successively sorted according to peak;
(503.2) the intensive footpath of initialization Status Flag flag=0, expression does not enter intensive footpath state;
(503.3) the intensive footpath set of initialization subscript j=0;
(503.4) if peak A DP set is not empty, select first element of current peak A DP set, be designated as ADP0; Otherwise, finish.
(503.5) if having 2 elements at least in the peak A DP set, and the peak range difference of the 2nd element in ADP0 and the ADP set is then carried out less than 1.5 chips
(503.6); Otherwise, carry out (503.7);
(503.6) if flag=0, illustrate that front, ADP0 position does not have adjacent with it multi-path dense, make j=j+1, set up a new intensive footpath ADP S set j, ADP0 is preserved among the Sj, and revise flag=1 (expression enters intensive footpath state), and from peak A DP set, delete ADP0, forward (503.4) to; Otherwise, illustrate that all there is adjacent with it multi-path dense front and back, ADP0 position, and had its intensive footpath ADP S set j that should belong to, therefore, ADP0 is preserved among the Sj, from peak A DP set, delete ADP0, forward (503.4) to;
(503.7) if flag=1, illustrate that there is adjacent with it multi-path dense front, ADP0 position, but there is not adjacent with it multi-path dense thereafter, and the intensive footpath ADP S set j that has existed it to belong to, therefore, ADP0 is preserved among the Sj, and revise flag=0 (intensive footpath state is withdrawed from expression), from peak A DP set, delete ADP0, forward (503.4) to; Otherwise illustrating before and after the ADP0 position does not all have adjacent with it multi-path dense, therefore, ADP0 is preserved in the independent footpath ADP S set 0, deletes ADP0 from peak A DP set, forwards (503.4) to;
Step 504 is carried out peak interpolation based on morning, noon and afternoon road principle to each the peak A DP in the independent footpath ADP S set 0, and concrete interpolation method is as follows:
(504.1) calculate the morning, noon and afternoon road and adjust factor R, as follows:
Wherein, early road ADP is meant to be the ADP of peak-1/2 chip position, and late road ADP is meant the ADP of peak+1/2 chip position, and middle road ADP is current peak A DP;
(504.2) R and some pre-set threshold values are compared.The corresponding some peaks of these threshold values (threshold value 1, threshold value 2... threshold value P) are adjusted step-length (step1, step2...).P is determined that by interpolation precision if be interpolated into 8 double precisions from 2 double precisions, then the P maximum gets 4, and each threshold value is by the decision of the desirable ADP peak value of Fig. 1 pattern curve.For example, during P=3,3 threshold values are set, factor R value is adjusted on the morning, noon and afternoon road that is respectively in the desirable peak value pattern curve when being offset 3/8 chip, 2/8 chip, 1/8 chip with peak.Concrete is as follows with R and threshold ratio process: if | R| does not then adjust peak smaller or equal to preset threshold value 1; Otherwise, if | R| then needs peak is moved step1 greater than predetermined threshold value 1 but less than threshold value 2; Similar, if | R| then needs peak is moved step2 greater than predetermined threshold value 2 but less than threshold value 3; The method that moves is carried out according to the symbol of R, if R＞0, then peak value to morning the road direction move, if R＜0, then peak value towards evening road direction moves;
Step 505 judges whether to exist intensive footpath ADP set, as existing, then changes step 506; As not existing, then flow process finishes;
Step 506, initialization promptly is provided with j=1 to the index of intensive footpath ADP process of aggregation;
Step 507 judges whether all intensive footpath ADP set of being untreated, and promptly judges whether j＜=N, in this way, then changes step 508; As not, then handle all intensive footpath ADP set that is over, flow process finishes;
Step 508 is supposed Sj={ADP1, ADP2 ... ADPM}, wherein ADP is according to delay positions sequence arrangement from small to large, and with 8 sampling accuracy representings.Described 8 sampling precision obtain like this: near the ADP ADP1 to the ADPM position is carried out linear interpolation operation (using the FIR filter), obtain 1/8 chip accuracy A DP, be designated as ADP8times; Concrete which kind of linear interpolation FIR filter that adopts is not in the scope of the invention, and the technical staff in same field can oneself select and realize;
Step 509 is eliminated the operation that disturb in adjacent intensive footpath to each peak A DP.For example for ADP1, other ADP peak values that cut from ADP8times except that ADP1 (are ADP2, ... (Fig. 1 thinks that peak curve can obtain to relevant peaks energy ADPM) according to reason, and only cut the main lobe energy, the main lobe energy refers to the energy near 1/2 chip of peak value herein), the ADP that other intensive footpaths disturb that is eliminated is designated as ADP8times1, will be as the peak interpolation input to ADP1; Similarly, obtain the ADP of other intensive footpaths interference of elimination of ADP2...ADPM, be designated as ADP8times2 respectively ... ADP8timesM;
Step 510, successively to ADP8times1, ADP8times2 ... ADP8timesM carries out the peak interpolation operation based on morning, noon and afternoon road principle, and concrete grammar is identical with step 504;
Step 511 is adjusted factor R value according to the morning, noon and afternoon road and is judged whether certain peak value among the Sj has been carried out the position adjustment, in this way, then changes step 512; As not, then change step 513;
Step 512 carries out preserving adjusted ADP in Sj after the adjustment of position to certain peak value among the Sj, changes step 509 then;
Step 513, the index j of intensive footpath ADP process of aggregation increases by 1, changes step 507 then.
Shown in Fig. 6 to 8, be application example of the present invention carries out the Multipath searching interpolation in the WCDMA system schematic diagram.Fig. 9 is a prior art, does not use the present invention, does not promptly carry out carrying out under the interference eliminated situation of intensive footpath the figure as a result of multipath interpolation.True multi-path location is 173 and 179, and the ADP peak that obtains by peak value searching is 175 and 183.The multi-path location that obtains after the process Fig. 6 interference eliminated first time and the multipath interpolation is 174 and 180; The multi-path location that obtains after process the 2nd interference eliminated of Fig. 7 and the multipath interpolation is 172 and 180; The multi-path location that obtains after process the 3rd interference eliminated of Fig. 8 and the multipath interpolation is 172 and 179.As seen, after three interference eliminated and multipath interpolation, multi-path location is basic, and having only a multi-path location deviation is 1/8 chip with truly multi-path location is consistent, and the multipath precision that is obtained meets the demands.If do not carry out intensive footpath interference eliminated, the interpolation result that obtains such as Fig. 9 are respectively 175 and 181, and with true multi-path location difference deviation 2/8 chip, error is very big.
That above embodiment and example obtain is 8 sampling accuracy A DP, if find the ADP of sampling precision more than 8 times, then need to carry out intensive more frequently adjacent footpath interference eliminated and described peak interpolation operation based on morning, noon and afternoon road principle, its method catches up with that to state step similar.
As can be seen, adopt method of the present invention, both can effectively improve the precision of Multipath searching, the interference of avoiding multi-path dense to cause, implementation complexity also is controlled effectively simultaneously.
Scheme of the present invention is not restricted to listed utilization in specification and the execution mode.Concerning the technology of the present invention those of ordinary skill in the field, can make various corresponding changes and distortion according to the present invention, and all these corresponding changes and distortion all belong to the protection range of claim of the present invention.
Claims (8)
1. the Multipath searching interpolation method of a Direct-Spread code division multiple access system, in the Multipath searching process, the peak amplitude time delay profile of 2 samplings is carried out peak interpolation based on morning, noon and afternoon road principle, it is characterized in that, wherein, there is the peak amplitude time delay profile in intensive adjacent footpath for those, carry out intensive adjacent footpath interference eliminated of one or many and described peak interpolation operation, up to finding 8 times or the amplitude time delay profile of eliminating fully after disturb in adjacent footpath of above sampling precision based on morning, noon and afternoon road principle.
2. method according to claim 1 is characterized in that, for those peak amplitude time delay profiles that does not have intensive adjacent footpath, directly carries out the amplitude time delay profile that described peak interpolation based on morning, noon and afternoon road principle obtains 8 times or above sampling precision.
3. method according to claim 1 is characterized in that, the described peak amplitude time delay profile that does not have an intensive adjacent footpath is meant and does not exist around this amplitude time delay profile with it spacing less than the peak amplitude time delay profile of 1.5 chips; The described peak amplitude time delay profile that has an intensive adjacent footpath is meant and exists around this amplitude time delay profile with it spacing less than the peak amplitude time delay profile of 1.5 chips.
4. as method as described in the claim 2, it is characterized in that described method comprises the steps:
(1) described multipath is done the computing of different delay with the baseband signal that receives and local scrambler and pilot tone, and the function that obtains is the amplitude time delay profile, and this amplitude time delay profile is 2 sampling precision;
(2) described multipath is provided with amplitude time delay profile noise gate, and carries out peak value and select, and obtains the set of peak amplitude time delay profile;
(3) described multipath decomposes peak amplitude time delay profile set, be divided into an independent footpath amplitude time delay profile set, the amplitude time delay profile S set 0 that does not promptly have intensive adjacent footpath, with N intensive footpath amplitude time delay profile S set 1...Sj...SN, wherein, N＞=0, what comprise in each intensive footpath amplitude time delay profile set is exactly the cluster amplitude time delay profile of neighbor distance less than 1.5 chips;
(4) described multipath carries out described peak interpolation based on morning, noon and afternoon road principle to each the peak amplitude time delay profile in the independent footpath amplitude time delay profile S set 0, obtains the amplitude time delay profile of 8 times or above sampling precision;
(5) if there is the amplitude time delay profile set of intensive footpath, then described multipath carries out one or many intensive footpath interference eliminated and described peak interpolation based on morning, noon and afternoon road principle to the peak amplitude time delay profile among each S set j, wherein, 1＜=j＜=N handles until the amplitude time delay profile that finds 8 times or above sampling precision and all intensive footpath amplitude time delay profile set.
5. as method as described in the claim 4, it is characterized in that in the step (5) as will find 8 sampling accuracy A DP, described method comprises the steps:
(5.1) suppose intensive footpath amplitude time delay profile ADP S set j={ADP1, ADP2, ... ADPM}, wherein, 1＜=j＜=N, N are intensive footpath amplitude time delay profile set number, and suppose with 8 sampling accuracy representings, described 8 sampling precision obtain like this: near the amplitude time delay profile ADP1 to the ADPM position is carried out the linear interpolation operation, obtain the amplitude time delay profile of 1/8 chip precision, be designated as ADP8times;
(5.2) described each peak amplitude time delay profile is eliminated the operation that disturb in adjacent intensive footpath: for example for ADP1, from ADP8times, cut the relevant peaks energy of other amplitude time delay profile peak values except that ADP1, the amplitude time delay profile that other intensive footpaths disturb is eliminated, be designated as ADP8times1, with it as input to the peak interpolation of ADP1; Similarly, obtain the amplitude time delay profile of other intensive footpaths interference of elimination of ADP2...ADPM, be designated as ADP8times2 respectively ... ADP8timesM;
(5.3) successively to described ADP8times1, ADP8times2 ... ADP8timesM carries out described peak interpolation operation based on morning, noon and afternoon road principle;
(5.4) if the result of described interpolation based on morning, noon and afternoon road principle shows certain peak value among the Sj has been carried out the position adjustment, then preserved adjusted amplitude time delay profile in Sj, forwarded step (5.2) then to and continue to carry out; The peak value among the Sj is not carried out the position adjustment if show based on the result of the interpolation of morning, noon and afternoon road principle, then current S set j handles, forward step (5.1) to other intensive footpath amplitude time delay profile S set j are carried out above-mentioned processing, all handle up to described intensive footpath amplitude time delay profile S set j.
6. as method as described in the claim 5, it is characterized in that in the step (5.2), the relevant peaks energy of described other amplitude time delay profile peak values obtains according to desirable peak curve.
7. as method as described in the claim 5, it is characterized in that in the step (5.1), described amplitude time delay profile is according to delay positions sequence arrangement from small to large.
8. as method as described in the claim 5, it is characterized in that, in the step (5.1), use finite impulse response filter that near the amplitude time delay profile ADP1 to the ADPM position is carried out the linear interpolation operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101459768A CN101123462B (en) | 2007-08-30 | 2007-08-30 | A multi-path search value interposition method for direct frequency spreading code division multi-address system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101459768A CN101123462B (en) | 2007-08-30 | 2007-08-30 | A multi-path search value interposition method for direct frequency spreading code division multi-address system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101123462A true CN101123462A (en) | 2008-02-13 |
| CN101123462B CN101123462B (en) | 2011-03-16 |
Family
ID=39085654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101459768A Active CN101123462B (en) | 2007-08-30 | 2007-08-30 | A multi-path search value interposition method for direct frequency spreading code division multi-address system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101123462B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010145537A1 (en) * | 2009-10-26 | 2010-12-23 | 中兴通讯股份有限公司 | Multipath searching method and device |
| CN102420635A (en) * | 2011-12-16 | 2012-04-18 | 华为技术有限公司 | Multipath search method and multipath searcher |
| 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 |
| CN104753562A (en) * | 2013-12-26 | 2015-07-01 | 联芯科技有限公司 | Multipath positioning method and system for code division multiple access communication system |
| CN108008419A (en) * | 2017-11-28 | 2018-05-08 | 北京卫星信息工程研究所 | Anti- deceiving jamming method and its detecting system based on FPGA |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1142688C (en) * | 2001-04-04 | 2004-03-17 | 上海大唐移动通信设备有限公司 | Selective merging method and device in multi-path diversity receiving |
-
2007
- 2007-08-30 CN CN2007101459768A patent/CN101123462B/en active Active
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102045084B (en) * | 2009-10-26 | 2013-12-04 | 中兴通讯股份有限公司 | Multi-path searching method and device |
| RU2518506C2 (en) * | 2009-10-26 | 2014-06-10 | ЗетТиИ Корпорейшн | Method and apparatus for multibeam search |
| EP2458760A4 (en) * | 2009-10-26 | 2014-03-26 | Zte Corp | Multipath searching method and device |
| EP2458760A1 (en) * | 2009-10-26 | 2012-05-30 | ZTE Corporation | Multipath searching method and device |
| WO2010145537A1 (en) * | 2009-10-26 | 2010-12-23 | 中兴通讯股份有限公司 | Multipath searching method and device |
| CN102045084A (en) * | 2009-10-26 | 2011-05-04 | 中兴通讯股份有限公司 | Multi-path searching method and device |
| CN102420635B (en) * | 2011-12-16 | 2013-10-02 | 华为技术有限公司 | Multipath search method and multipath searcher |
| US8824525B2 (en) | 2011-12-16 | 2014-09-02 | Huawei Technologies Co., Ltd. | Multipath searching method and multipath searcher |
| CN102420635A (en) * | 2011-12-16 | 2012-04-18 | 华为技术有限公司 | Multipath search method and multipath searcher |
| 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 |
| CN102904605B (en) * | 2012-09-25 | 2014-10-15 | 京信通信系统（中国）有限公司 | Method and device for determining multipath information and rake receiver |
| CN104753562A (en) * | 2013-12-26 | 2015-07-01 | 联芯科技有限公司 | Multipath positioning method and system for code division multiple access communication system |
| CN104753562B (en) * | 2013-12-26 | 2017-08-25 | 联芯科技有限公司 | Multipath localization method and system for code division multiple address communication system |
| CN108008419A (en) * | 2017-11-28 | 2018-05-08 | 北京卫星信息工程研究所 | Anti- deceiving jamming method and its detecting system based on FPGA |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101123462B (en) | 2011-03-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1095467B1 (en) | Adaptive path selection threshold setting for ds-cdma receivers | |
| CN101123462B (en) | A multi-path search value interposition method for direct frequency spreading code division multi-address system | |
| KR20070068323A (en) | Path searcher and path searching method | |
| CN1299199A (en) | Code multiplex system and operation method having improved signal catching and processing | |
| US7167529B2 (en) | Method and device for radio signal reception | |
| CN109450574B (en) | Wireless channel multipath clustering method and device in high-speed rail communication network | |
| CN108521282B (en) | A kind of arrival time estimation method eliminated based on noise | |
| US8085889B1 (en) | Methods for managing alignment and latency in interference cancellation | |
| CN101359926A (en) | Receiver, channel estimation method and apparatus | |
| CN1615598B (en) | Low complexity multiuser detector and method for generating de-spread sequence for user in CDMA reciever system | |
| CN100382449C (en) | Method for recovering data in communication signal and rake receiver realizing the same method | |
| WO2008122153A1 (en) | Dynamic multi-path detecting method and device in cdma communication system | |
| US20030103555A1 (en) | Apparatus for searching multipath in spread spectrum communications system and method thereof | |
| CN101072046A (en) | Multi-path selecting method and receiver | |
| CN102868422A (en) | MMSE-BDFE (Minimum Mean Square Error-Blind Decision Feedback Equalizer) multi-user detection system based on neural network, and working method of MMSE-BDFE multi-user detection system | |
| CN102223173B (en) | Method and device for coarse synchronizing sub-frame | |
| US20160365991A1 (en) | Method and System for Performing Optimized Channel Estimation | |
| CN105007097B (en) | Self-adaptive multipath management method of CDMA system | |
| CN101183881B (en) | Multipath search method and apparatus, signal reception processing method and Rake receiver | |
| CN100388639C (en) | Multi-path time-delay estimating method for direct spread-spectrum CDMA system | |
| JP2003502908A (en) | Method for tracking symbol spacing and / or tracking fractionally spaced fading radio channels | |
| JP2000332652A (en) | Synthesis method of cdma cellular in rake receiver | |
| CN101895311B (en) | Signal-receiving method and receiver | |
| CN100438385C (en) | Baseband receiving synchronous acquiring method and apparatus for CDMA system | |
| CN101160736B (en) | Path search processing circuit, path search method and control program |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |