CN101667848A - Method and device for multi-path searching in CDMA (code-division multiple access) system - Google Patents
Method and device for multi-path searching in CDMA (code-division multiple access) system Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The invention discloses a method and a device for multi-path searching in a CDMA (code-division multiple access) system. Coherent integration calculation and incoherent integration calculation are respectively carried out to a dedicated physical control channel (DPCCH) and an enhanced dedicated physical control channel (E-DPCCH), thus obtaining relevant functions of the DPCCH channel and the E-DPCCH channel; the final relevant function is obtained by the calculation or selection according to the relevant functions of the DPCCH channel and the relevant functions of the E-DPCCH channel; subsequently, the multi-path set of the searching is obtained by peak detection and interpolation; and the multi-path set of the searching is used for tracking searching window so as to adjust the position of the searching window and is also used for carrying out multi-path combination with the historical multi-path set, thus obtaining the final multi-path set and outputting the final multi-path set to areceiver. In the invention, the multi-path searching is carried out under a situation that the DPCCH channel and the E-DPCCH channel coexist, the defects of singly using the DPCCH channel for searching under certain situations are overcome, and the whole performance of the searcher is improved.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to multipath searching method and device in the Direct-Spread code division multiple access system.
Background technology
In the Direct-Spread code division multiple access system, up employing pseudo random sequence (PseudorandomNoise, PN sequence) is for spread-spectrum signal carries out scrambling, to distinguish different users.If the local PN sequence that the wireless interface receiving end produces and the PN sequence phase of received signal are synchronous fully, the spread-spectrum signal that correct despreading is received with regard to energy.Be the Phase synchronization of the PN sequence of finishing received signal, effective separating multiple diameter needs correctly to estimate between the transceiver and the time delay between each footpath signal.
At present, usually use the pilot signal in the special used for physical control channel DPCCH (Dedicated Physical ControlChannel) to estimate multidiameter delay, promptly do the relevant of different delay with known scrambler with frequency pilot sign, obtain a correlation function with the baseband signal that receives.Correlation function a peak value can occur when relevant time-delay is identical with multipath delay, seek peak value in the correlation function waveform, if this peak value is greater than certain thresholding then the time delay that its pairing time delay is exactly a multipath.
Because the scrambler and the frequency pilot sign of receiving terminal are known, relevant with it with the baseband signal that receives, can obtain correlation function more accurately.3GPP agreement Rel-6 version and before version in, for the difference of the energy of the professional DPCCH channel of HSUPA (High-Speed Uplink Packet Access, high speed uplink packet insert) and each channel gross energy less than 15dB.But in 3GPP agreement Rel-7 and later version, owing to introduced new fixed reference channel FRC8, at FRC8E-DPCCH (Enhanced Dedicated Physical Control Channel, strengthen Dedicated Physical Control Channel) raised the energy of E-DPCCH and E-DPDCH (Enhanced DedicatedPhysical Data Channel strengthens Dedicated Physical Data Channel) under the Boosting pattern.Because the energy of DPCCH itself is less and because the interference of other code channel that the existence of multipath causes, make the performance rapid deterioration of under FRC8E-DPCCH Boosting pattern, searching for DPCCH.Find that through strict theoretical and link simulation continue can not satisfy the requirement of receiver to search multipath energy and precision with the DPCCH search, the performance of receiver can not satisfy the requirement of 3GPP agreement under FRC8E-DPCCH Boosting pattern.
Therefore, in order to improve the performance of searcher under this pattern, and then the demodulation performance that improves receiver just needs to propose a kind of new searcher method, to be different from the multipath searching method that independent use DPCCH channel carries out to satisfy the requirement of 3GPP agreement better.
Summary of the invention
Technical problem to be solved by this invention is, the method and apparatus of Multipath searching in a kind of code division multiple access system is provided, under DPCCH channel and the simultaneous scene of E-DPCCH channel, carry out Multipath searching, overcome independent use DPCCH channel and search for drawback under some scene, improve the overall performance of searcher.
In order to address the above problem, the present invention proposes a kind of multipath, comprising: calculate the correlation function module, the correlation function combiner, peak detection block, the multipath interpolating module, the search window tracker, multipath merges module, wherein:
Calculate the correlation function module, be used for calculating the correlation function of DPCCH, be used for calculating the correlation function of E-DPCCH according to the Dedicated Physical Control Channel (E-DPCCH) that strengthens according to Dedicated Physical Control Channel (DPCCH);
The correlation function combiner is used for calculating or select final correlation function according to the correlation function of described DPCCH and the correlation function of E-DPCCH;
Peak detection block is used for utilizing described peak value threshold detection peak according to described final correlation function dynamic calculation peak value threshold, obtains the multipath information of 0.5 chip precision;
The multipath interpolating module is used for the detected multipath information of peak detection block is carried out interpolation, improves the precision of multipath, obtains the multipath information after the interpolation;
The search window tracker, the multipath information after the interpolation that is used for exporting after the interpolation according to this Multipath searching is adjusted the position of search window;
Multipath merges module, is used to utilize multipath set and the set of historical multipath after the interpolation of multipath interpolating module output to merge, and obtains final multipath set, and final multipath is gathered export to receiver.
Further, described calculating correlation function module comprises: calculate DPCCH correlation function submodule, be used for going out according to the DPCCH channel calculation correlation function of DPCCH; Calculate E-DPCCH correlation function submodule, be used for going out the correlation function of E-DPCCH according to the E-DPCCH channel calculation.
Further, described calculating DPCCH correlation function submodule comprises: DPCCH coherent integration device, be used for calculating the coherent integration of DPCCH, and obtain the symbol behind the DPCCH channel coherent accumulation; The DPCCH non-coherent integrator is used for the symbol behind the DPCCH channel coherent accumulation is carried out noncoherent accumulation, is output as the correlation function of DPCCH.
Described DPCCH coherent integration device is further divided into: the descrambling submodule, carry out descrambling to antenna data and the known scrambler that receives; The despreading submodule carries out despreading to data and known DPCCH spreading code after the descrambling; Pilot tone depolarization submodule is handled with known DPCCH frequency pilot sign depolarization the symbol after the despreading; The coherent accumulation submodule, the some symbols after the depolarization are added up obtains symbol behind the DPCCH channel coherent accumulation.
Described DPCCH non-coherent integrator is further divided into: amplitude or power calculation submodule, sign computation amplitude or power that the coherent accumulation that described DPCCH coherent integration device is exported obtains; The noncoherent accumulation submodule, the amplitude of several slots or power results added up obtains the correlation function of DPCCH.
Further, described calculating E-DPCCH correlation function submodule comprises: E-DPCCH coherent integration device is used for calculating the coherent integration of E-DPCCH, the symbol that obtains behind the output E-DPCCH channel coherent accumulation; The E-DPCCH non-coherent integrator is used for the symbol behind the E-DPCCH channel coherent accumulation is carried out noncoherent accumulation, is output as the correlation function of E-DPCCH.
Described E-DPCCH coherent integration device is further divided into: the descrambling submodule, carry out descrambling to antenna data and the known scrambler that receives; The despreading submodule carries out despreading to data and known spreading code after the descrambling; Cache sub-module is carried out buffer memory to the symbol after the despreading, waits for the E-DPCCH decode results; Symbol depolarization submodule after decoding arrives, is deciphered the symbol depolarization that obtains to the buffer memory symbol with E-DPCCH; The coherent accumulation submodule, the some symbols after the depolarization are added up obtains symbol behind the E-DPCCH channel coherent accumulation.
Described E-DPCCH non-coherent integrator is further divided into: amplitude or power calculation submodule, sign computation amplitude or power that the coherent accumulation that described E-DPCCH coherent integration device is exported obtains; The noncoherent accumulation submodule, the amplitude of several slots or power results added up obtains the correlation function of DPCCH.
Further, described correlation function combiner comprises:
First calculating sub module is used to obtain the correlation function ADP_c of DPCCH, calculates maximum ADPmax_c and the average ADPmean_c of correlation function ADP_c according to the correlation function ADP_c of DPCCH;
Second calculating sub module is used to obtain E-DPCCH correlation function ADP_ec, calculates maximum ADPmax_ec and the average ADPmean_ec of correlation function ADP_ec according to the correlation function ADP_ec of E-DPCCH;
Comparison sub-module is used to judge whether following formula is set up:
ADPmax_ec*ADPmean_c＞ADPmax_c*ADPmean_ec，
If set up, then indicate the assignment submodule to give final correlation function ADP_final with the ADP_ec assignment; If be false, then indicate the assignment submodule to give final correlation function ADP_final with the ADP_c assignment.
Further, the multipath information after the described interpolation of described multipath interpolating module output is the multipath information of 1/4 chip, 1/8 chip, 1/16 chip or 1/32 chip precision.
The present invention also provides a kind of method of Multipath searching, comprises the steps:
Steps A. Dedicated Physical Control Channel (DPCCH) is carried out the correlation function that coherent integration and non-coherent integration calculate the DPCCH channel, the Dedicated Physical Control Channel (E-DPCCH) that strengthens is carried out the correlation function that coherent integration and non-coherent integration obtain the E-DPCCH channel;
Step B. calculates or selects to obtain final correlation function according to the correlation function of DPCCH channel and the correlation function of E-DPCCH channel;
Step C. calculates peak value threshold according to described final correlation function, and carries out peak value and detect the multipath information that obtains 0.5 chip precision;
Step D. carries out multipath information after interpolation obtains interpolation to the multipath of 0.5 chip precision;
Step e. adjust search window position according to the multipath information after the interpolation of step D output, dynamically adjust search window position with the drift of multipath;
Step F. multipath set and historical multipath set carrying out multipath to this search merge, and obtain final multipath set, and export to receiver.
In the described steps A, Dedicated Physical Control Channel (DPCCH) is carried out the step that coherent integration and non-coherent integration calculate the correlation function of DPCCH channel specifically is divided into again:
Steps A 1, according to antenna data and known scrambler, utilize the coherent integration device to calculate the coherent integration of DPCCH, obtain the symbol behind the DPCCH channel coherent accumulation;
Described steps A 1 specifically comprises:
Antenna data and the known scrambler that receives carried out descrambling;
Data and known DPCCH spreading code after the descrambling are carried out despreading;
Symbol after the despreading is handled with known DPCCH frequency pilot sign depolarization;
Some symbols after the depolarization are added up obtain symbol behind the DPCCH channel coherent accumulation.
Described steps A 2 specifically comprises:
Sign computation amplitude or power that described coherent accumulation is obtained;
The amplitude of several slots or power results added up obtain the correlation function of DPCCH.
In the described steps A, the Dedicated Physical Control Channel (E-DPCCH) that strengthens is carried out the step that coherent integration and non-coherent integration obtain the correlation function of E-DPCCH channel, specifically is divided into again:
A3, according to the symbol after antenna data, scrambler, E-DPCCH spreading code, the E-DPCCH decoding, utilize the coherent integration device to calculate the coherent integration of E-DPCCH, the symbol that obtains behind the output E-DPCCH channel coherent accumulation;
A4, utilize non-coherent integrator, the symbol behind the E-DPCCH channel coherent accumulation is carried out noncoherent accumulation, be output as the correlation function of E-DPCCH.
Described steps A 3 specifically comprises:
Antenna data and the known scrambler that receives carried out descrambling;
Data and known spreading code after the descrambling are carried out despreading;
Symbol after the despreading is carried out buffer memory, wait for the E-DPCCH decode results;
After decoding arrives, the buffer memory symbol is deciphered the symbol depolarization that obtains with E-DPCCH;
Some symbols after the depolarization are added up obtain symbol behind the E-DPCCH channel coherent accumulation.
Described steps A 4 specifically comprises:
Sign computation amplitude or power that described coherent accumulation is obtained;
The amplitude of several slots or power results added up obtain the correlation function of DPCCH.
Specifically comprise among the described step B:
Step B1:
Obtain the correlation function ADP_c of DPCCH, calculate maximum ADPmax_c and the average ADPmean_c of correlation function ADP_c according to the correlation function ADP_c of DPCCH;
Obtain E-DPCCH correlation function ADP_ec, calculate maximum ADPmax_ec and the average ADPmean_ec of correlation function ADP_ec according to the correlation function ADP_ec of E-DPCCH;
Step B2: judge relatively whether following formula is set up:
ADPmax_ec*ADPmean_c＞ADPmax_c*ADPmean_ec，
If set up, then give final correlation function ADP_final with the ADP_ec assignment; If be false, then give final correlation function ADP_final with the ADP_c assignment.
Among the described step D, the multipath information of multipath information 1/4 chip after the described interpolation, 1/8 chip, 1/16 chip or 1/32 chip precision.
Compared with prior art, the present invention has introduced the search of E-DPCCH channel, promptly utilizes the result of E-DPCCH channel hard decision or decoding to calculate the multidiameter correlation function.This correlation function and use the multidiameter correlation function of DPCCH channel pilot frequency sign computation to unite and carry out Multipath searching is to improve the peak-to-average force ratio of correlation function.Can overcome like this and utilize DPCCH channel search drawback of (SIR of DPCCH channel is too low) under some scene separately, improve the performance of search.The technology of this Syndicating search is essential scheme for FRC8E-DPCCH Boosting pattern.
The frequency pilot sign of comparing independent use DPCCH calculates correlation function, utilizes E-DPCCH hard decision or decode results to calculate correlation function and can utilize more symbol to carry out correlation computations, can improve the peak-to-average force ratio of correlation function like this.In addition, some DPCCH search can satisfy performance requirement and the energy of E-DPCCH than the high scene of the energy of DPCCH under, Syndicating search can further improve the performance of searcher.
In addition, the present invention also provides a kind of method of calculating or select final correlation function according to DPCCH correlation function and E-DPCCH correlation function.Even utilize this method can guarantee that searcher also can obtain search performance preferably under the frequent situation about switching of different scenes.
Description of drawings
Fig. 1 is the multipath block diagram of now general independent use DPCCH channel;
Fig. 2 is the multipath block diagram that the present invention unites DPCCH and E-DPCCH channel;
Fig. 3 is the algorithm block diagram of present general calculation DPCCH channel correlation function;
Fig. 4 is the algorithm block diagram that the present invention calculates E-DPCCH channel correlation function;
Fig. 5 is the block diagram that the present invention unites correlation function combiner in the multipath of DPCCH and E-DPCCH channel;
Fig. 6 is that the present invention unites the search handling process of using DPCCH and E-DPCCH channel;
Fig. 7 is a kind of handling process of calculating the method for final correlation function of the present invention;
Fig. 8 is that identical receiver uses existing universal search device (only using the DPCCH channel search) and the simulation performance of searcher of the present invention under FRC3PB3;
Fig. 9 is that identical receiver uses existing universal search device (only using the DPCCH channel search) and searcher of the present invention to unite the simulation performance that uses DPCCH and E-DPCCH channel under FRC8E-DPCCH Boosting pattern PB3.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
The object of the invention is, the method and apparatus of Multipath searching in a kind of code division multiple access system is provided, and particularly unites the method and apparatus that carries out Multipath searching by DPCCH channel and E-DPCCH channel in the HSUPA system.In the lower scene of some DPCCH channel energy, adopt DPCCH channel and E-DPCCH channel Syndicating search, improve the peak-to-average force ratio of correlation function and the overall performance of searcher.
As shown in Figure 1, shown the multipath that present general independent use DPCCH channel is searched for, this multipath, comprise and calculate DPCCH correlation function module 101, peak detection block 102, multipath interpolating module 103, search window tracker 104, multipath merges module 105.Wherein:
Calculate DPCCH correlation function module 101: be used for utilizing coherent integration device a1 to carry out correlation computations, obtain coherent integration result's (plural form) of DPCCH channel according to the antenna data and scrambler, DPCCH spreading code, the DPCCH frequency pilot sign that receive; Utilize non-coherent integrator a2 that the coherent integration result of DPCCH channel is calculated amplitude or power again, the amplitude of several slots or power add up then, obtain the result of DPCCH channel non-coherent integration, are the correlation function of DPCCH;
Peak detection block 102: be used for the dynamic calculation peak value threshold, and, obtain the lower multipath information of precision according to correlation function and the peak value threshold detection peak of DPCCH;
Multipath interpolating module 103: be used for detected peak value is carried out interpolation,, obtain the multipath information of degree of precision to improve the precision of multipath;
Search window tracker 104: be used for the position of search window being adjusted according to certain algorithm according to the result of this Multipath searching, to guarantee the drift along with multipath, search window still can be caught the most of multipaths that comprise most powerful path;
Multipath merges module 105: be used for the multipath set and the set of historical multipath of this search are merged, obtain final multipath set, and export to receiver.
As shown in Figure 2, shown that DPCCH of the present invention and E-DPCCH channel unite the multipath of searching for, the multipath of this associating, comprise and calculate correlation function module 201, correlation function combiner 202, peak detection block 203, multipath interpolating module 204, search window tracker 205, multipath merges module 206.Wherein:
Calculate correlation function module 201, be used for calculating the DPCCH correlation function and going out the correlation function of E-DPCCH, further can be divided into again: calculate DPCCH correlation function submodule a and calculate E-DPCCH correlation function submodule b according to the E-DPCCH channel calculation according to DPCCH;
Calculating DPCCH correlation function submodule a comprises: DPCCH coherent integration device a1 is used for calculating the coherent integration of DPCCH; DPCCH non-coherent integrator a2 is used for the symbol behind the DPCCH channel coherent accumulation is carried out noncoherent accumulation, is output as the correlation function of DPCCH;
Calculating E-DPCCH correlation function submodule b comprises: E-DPCCH coherent integration device b1 is used for calculating the coherent integration of E-DPCCH; E-DPCCH non-coherent integrator b2 is used for the symbol behind the E-DPCCH channel coherent accumulation is carried out noncoherent accumulation, is output as the correlation function of E-DPCCH.
Correlation function combiner 202: be used for calculating or select final correlation function according to DPCCH correlation function and E-DPCCH correlation function;
Peak detection block 203: be used for the dynamic calculation peak value threshold, and, obtain the lower multipath information of precision, for example obtain the multipath information of 0.5 chip precision according to described final correlation function and peak value threshold detection peak;
Multipath interpolating module 204: be used for peak detection block 203 detected multipaths are carried out interpolation, to improve the precision of multipath, obtain the multipath information of degree of precision, for example the multipath information of 0.5 chip precision is carried out interpolation, obtain the multipath information of 1/4 chip, 1/8 chip, 1/16 chip or 1/32 chip precision;
Search window tracker 205: be used for the position of search window being adjusted according to certain algorithm according to the result of this Multipath searching, to guarantee the drift along with multipath, search window still can be caught most multipath energy; Existing search window adjustment algorithm has a lot, can be applied to the present invention, repeats no more here.
Multipath merges module 206: the multipath set and the set of historical multipath that are used for current detection is arrived merge, and obtain final multipath set, and export to receiver.When searching for for the first time, do not have historical multipath information, do not carry out multipath and merge; Search for the second time merges the result of search for the first time as the multipath set of historical multipath set and search for the second time, obtain for the second time final multipath set; Search for the third time merges the multipath set of the most historical multipath set of for the second time final multipath set and search for the third time, obtains final for the third time multipath set, by that analogy.
According to Fig. 1 and Fig. 2, and compare and can find in conjunction with above-mentioned specific descriptions, the difference of two kinds of searchers is to calculate correlation function module 201 and correlation function combiner 202, and the function of other modules is identical.Thereby, will unite the multipath of searching for to employing DPCCH of the present invention and E-DPCCH channel according to Fig. 2 below and describe in detail, especially introduce and calculate correlation function module 201 and correlation function combiner 202.
Described calculating correlation function module 201 is used for calculating the correlation function of DPCCH channel and E-DPCCH channel.Comprise: calculate DPCCH correlation function submodule a and calculate E-DPCCH correlation function submodule b.
(1) calculates DPCCH correlation function submodule a, be used to calculate the correlation function of DPCCH channel.It comprises again:
DPCCH coherent integration device a1: be used for calculating the coherent integration of DPCCH, the input of DPCCH coherent integration device a1 comprises antenna data, scrambler, DPCCH spreading code, DPCCH frequency pilot sign, is output as the symbol that obtains behind the DPCCH channel coherent accumulation.
DPCCH non-coherent integrator a2: be used for the symbol behind the DPCCH channel coherent accumulation is carried out noncoherent accumulation (to sign computation amplitude or the power that coherent accumulation obtains, summation then adds up).Symbol behind the DPCCH coherent accumulation that is input as a1 output of DPCCH non-coherent integrator a2 is output as the correlation function of DPCCH.
DPCCH coherent integration device a1 and DPCCH non-coherent integrator a2 calculate the DPCCH channel correlation function the detailed process process as shown in Figure 3:
In DPCCH coherent integration device a1, at first, the antenna data and the known scrambler of 301 pairs of receptions of descrambling submodule carry out descrambling; After the descrambling, data and known DPCCH spreading code after 302 pairs of descramblings of despreading submodule carry out despreading; Symbol after 303 pairs of despreadings of pilot tone depolarization submodule is handled with known DPCCH frequency pilot sign depolarization; Some symbols after 304 pairs of depolarizations of coherent accumulation submodule add up and obtain symbol behind the DPCCH channel coherent accumulation.
In DPCCH non-coherent integrator a2, at first, sign computation amplitude or power that 305 pairs of coherent accumulation submodule 304 coherent accumulations of amplitude or power calculation submodule obtain; Then, the result of 306 pairs of several slots of noncoherent accumulation submodule (being amplitude or performance number) adds up and obtains the correlation function of DPCCH.
(2) calculate E-DPCCH correlation function submodule b, be used for realizing the correlation function of E-DPCCH channel.It comprises again:
E-DPCCH coherent integration device b1 is used for calculating the coherent integration of E-DPCCH.Its input comprises the symbol after antenna data, scrambler, E-DPCCH spreading code, E-DPCCH hard decision or the decoding, is output as the symbol that obtains behind the E-DPCCH channel coherent accumulation.Because the hard decision of E-DPCCH or decoding need the time, the data after the despreading need first buffer memory, wait for the hard decision or the decode results of E-DPCCH channel, with the hard decision of E-DPCCH channel or decode results to the symbol depolarization after the despreading of buffer memory.
E-DPCCH non-coherent integrator b2 is used for the symbol that E-DPCCH coherent integration device b1 carries out behind the E-DPCCH channel coherent accumulation is carried out noncoherent accumulation.The symbol that it is input as behind the DPCCH coherent accumulation of b1 output is output as the correlation function of E-DPCCH.
E-DPCCH coherent integration device b1 and E-DPCCH non-coherent integrator b2 calculate the E-DPCCH channel correlation function the detailed process process as shown in Figure 4:
In E-DPCCH coherent integration device b1, at first, the antenna data and the known scrambler of 401 pairs of receptions of descrambling submodule carry out descrambling; After the descrambling, data and known spreading code after 402 pairs of descramblings of despreading submodule carry out despreading; Then, the symbol after 403 pairs of despreadings of cache sub-module carries out buffer memory, waits for E-DPCCH hard decision or decode results; After decoding arrives, symbol depolarization submodule 404, the symbol depolarization that the buffer memory symbol is obtained with E-DPCCH hard decision or decoding; After the depolarization, the some symbols after 405 pairs of depolarizations of coherent accumulation submodule add up and obtain symbol behind the E-DPCCH channel coherent accumulation.
In E-DPCCH non-coherent integrator b2, sign computation amplitude or power that 406 pairs of coherent accumulation submodule 405 coherent accumulations of amplitude or power calculation submodule obtain; Noncoherent accumulation submodule 407, result's (being amplitude or performance number) of several slots added up obtains the correlation function of DPCCH.
First calculating sub module 501 is used to obtain DPCCH correlation function ADP_c, calculates its maximum ADPmax_c and average ADPmean_c according to the correlation function ADP c of DPCCH;
Second calculating sub module 502 is used to obtain E-DPCCH correlation function ADP_ec, calculates its maximum ADPmax_ec and average ADPmean_ec according to the correlation function ADP_ec of E-DPCCH;
ADPmax_ec*ADPmean_c＞ADPmax_c*ADPmean_ec，
If set up, then indicate assignment submodule 504 to give final correlation function ADP_final with the ADP_ec assignment; If be false, then indicate assignment submodule 504 to give final correlation function ADP_final with the ADP_c assignment.
Multipath interpolating module 204 is used for peak detection block 203 is detected the further interpolation of multipath that obtains, and obtains more high-precision multipath information.The multipath set that it is input as the 0.5 chip precision that peak detection block 203 obtains is output as the more multipath set of high accuracy (for example 1/4 chip, 1/8 chip, 1/16 chip or 1/32 chip).
Search window tracker 205 is used for the multipath information that obtains according to multipath interpolating module 204 interpolation, search window position is adjusted, to guarantee that search window can cover the most of multipaths that comprise most powerful path.The multipath aggregate information that it is input as the high accuracy (for example 1/4 chip, 1/8 chip, 1/16 chip or 1/32 chip) that multipath interpolating module 204 interpolation obtain is output as direction and size that search window position is adjusted.
Multipath merges module 206, and the multipath set and the set of historical multipath that are used for this search is obtained merge, and obtain final multipath set, and receiver etc. is sent in final multipath set.It is input as multipath set and the set of historical multipath that multipath interpolating module 204 obtains this search, is output as final multipath set.When searching for for the first time, do not have historical multipath information, do not carry out multipath and merge; Search for the second time merges the result of search for the first time as the multipath set of historical multipath set and search for the second time, obtain for the second time final multipath set; Search for the third time merges the multipath set of the most historical multipath set of for the second time final multipath set and search for the third time, obtains final for the third time multipath set, by that analogy.
Associating DPCCH of the present invention and E-DPCCH channel carry out the method for Multipath searching, comprise the steps:
Steps A. respectively DPCCH channel, E-DPCCH channel are carried out coherent integration and non-coherent integration, calculate the correlation function of DPCCH channel and the correlation function of E-DPCCH channel;
Step B. calculates or selects to obtain final correlation function according to the correlation function of DPCCH channel and the correlation function of E-DPCCH channel;
Step C. calculates peak value threshold according to described final correlation function, and carries out peak value and detect the multipath information that obtains 0.5 chip precision;
Step D. carries out interpolation to the multipath of 0.5 chip precision and obtains the multipath information that precision is 1/4 chip, 1/8 chip, 1/16 chip or 1/32 chip;
Step e. the precision according to step D output is the multipath information adjustment search window position of 1/4 chip, 1/8 chip, 1/16 chip or 1/32 chip, along with search window position is dynamically adjusted in the drift of multipath;
Step F. multipath set and historical multipath set carrying out multipath to this search merge, and obtain final multipath set, and export to receiver.Described historical multipath set is the also final multipath set of back output of multipath set last time, or the multipath of several times search is before gathered the result who merges.
As shown in Figure 6, shown that associating DPCCH and E-DPCCH channel carry out a specific embodiment of Multipath searching.The handling process of uniting DPCCH and E-DPCCH channel multi-path searching based on searcher shown in Figure 2 is as follows:
Step 601: reception antenna data;
Step 602: calculate DPCCH correlation function and E-DPCCH correlation function respectively, comprise the step 602a and the step 602b that carry out simultaneously:
The input of DPCCH coherent integration device a1 comprises antenna data, scrambler, and the DPCCH spreading code, the DPCCH frequency pilot sign is output as the symbol that obtains behind the DPCCH channel coherent accumulation.
The symbol of DPCCH non-coherent integrator a2 after to DPCCH channel coherent accumulation carries out noncoherent accumulation (sign computation amplitude or power that coherent accumulation is obtained, summation then adds up), the symbol that it is input as behind the DPCCH coherent accumulation of a1 output is output as the correlation function of DPCCH.
E-DPCCH coherent integration device b1 is used for calculating the coherent integration of E-DPCCH.Its input comprises antenna data, scrambler, and the E-DPCCH spreading code, the symbol after E-DPCCH hard decision or the decoding is output as the symbol that obtains behind the E-DPCCH channel coherent accumulation.Notice that because the hard decision of E-DPCCH or decoding need the time, the data after the despreading need first buffer memory, wait for the hard decision or the decode results of E-DPCCH channel, the hard decision of E-DPCCH channel or decode results are to the symbol depolarization after the despreading of buffer memory.
E-DPCCH non-coherent integrator b2 is used for the symbol behind the E-DPCCH channel coherent accumulation is carried out noncoherent accumulation.The symbol that it is input as behind the DPCCH coherent accumulation of b1 output is output as the correlation function of E-DPCCH.
Step 603: according to DPCCH correlation function and E-DPCCH correlation function, carry out correlation function and merge, calculate or select to obtain final correlation function; The concrete handling process of calculating final correlation function as shown in Figure 7.
Step 604: final correlation function is carried out peak value detect, detection peak is exported the multipath information of 0.5 chip precision;
Step 605: the multipath information that peak value is detected 0.5 chip precision of output is input into capable multipath interpolation, obtains the more multipath information of high accuracy (1/4 chip, 1/8 chip, 1/16 chip or 1/32 chip precision);
Step 606: the multipath information of 1/4 chip, 1/8 chip, 1/16 chip or the 1/32 chip precision of step 605 output, one side is as the input (being the input that search window position is adjusted) of search window tracker 205, the multipath information that utilization obtains is carried out the search window adjustment according to certain algorithm, determine direction and size that search window is adjusted, the output of search window adjustment feeds back to step 604, and the output valve of search window adjustment is adjusted the position of search window in view of the above;
Step 607: the multipath information of 1/4 chip, 1/8 chip, 1/16 chip or the 1/32 chip precision of step 605 output, the input that merges as multipath on the other hand, multipath information and historical multipath information according to this search are carried out the multipath merging according to certain algorithm, obtain final multipath information;
Step 608: final multipath information is exported to receiver and is used, and flow process finishes.
As shown in Figure 7, shown the concrete handling process of the correlation function that calculating in the step 603 is final, having comprised:
Step 701a: obtain DPCCH correlation function ADP_c;
Step 702a: the correlation function ADP_c according to DPCCH calculates its maximum ADPmax_c and average ADPmean_c;
Step 701b: obtain E-DPCCH correlation function ADP_ec;
Step 702b: the correlation function ADP_ec according to E-DPCCH calculates its maximum ADPmax_ec and average ADPmean_ec;
First branch road of above-mentioned steps 701a, 702a is that sequencing is carried out, and second branch road of step 701b, 702b is that sequencing is carried out: then be to carry out simultaneously between two branch roads.
Step 703: judge whether ADPmax_ec*ADPmean_c＞ADPmax_c*ADPmean_ec sets up, change step 704, otherwise change step 705 if set up;
Step 704: give final correlation function ADP_final the ADP_ec assignment;
Step 705: give final correlation function ADP_final the ADP_c assignment.
Fig. 8 is that identical receiver uses existing universal search device (only using the DPCCH channel search) and searcher of the present invention to carry out the simulation performance of Multipath searching under FRC3PB3.As can be seen from Figure 8, the performance of two kinds of searchers is suitable, promptly can satisfy the scene of performance requirement at some existing searchers, and searcher of the present invention also can satisfy performance requirement, and performance is suitable with existing searcher performance.
Fig. 9 is that identical receiver uses existing universal search device (only using the DPCCH channel search) and searcher of the present invention to unite the simulation performance that DPCCH and E-DPCCH channel carry out Multipath searching under FRC8E-DPCCH Boosting pattern PB3.As can be seen from Figure 9, under some special screnes as FRC8E-DPCCH Boosting pattern, existing searcher mis-behave is bigger, can not satisfy performance requirement; And use searcher of the present invention can satisfy performance requirement well.
The above is embodiments of the invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (13)
1, a kind of multipath is characterized in that, comprising: calculate the correlation function module, and the correlation function combiner, peak detection block, the multipath interpolating module, the search window tracker, multipath merges module, wherein:
Calculate the correlation function module, be used for calculating the correlation function of DPCCH, be used for calculating the correlation function of E-DPCCH according to the Dedicated Physical Control Channel (E-DPCCH) that strengthens according to Dedicated Physical Control Channel (DPCCH);
The correlation function combiner is used for calculating or select final correlation function according to the correlation function of described DPCCH and the correlation function of E-DPCCH;
Peak detection block is used for utilizing described peak value threshold detection peak according to described final correlation function dynamic calculation peak value threshold, obtains the multipath information of 0.5 chip precision;
The multipath interpolating module is used for the detected multipath information of peak detection block is carried out interpolation, improves the precision of multipath, obtains the multipath information after the interpolation;
The search window tracker, the multipath information that is used for exporting after the interpolation according to this Multipath searching is adjusted the position of search window;
Multipath merges module, is used to utilize multipath set and the set of historical multipath after the interpolation of multipath interpolating module output to merge, and obtains final multipath set, and final multipath is gathered export to receiver.
2, multipath as claimed in claim 1 is characterized in that, described calculating correlation function module comprises:
Calculate DPCCH correlation function submodule, be used for going out the correlation function of DPCCH according to the DPCCH channel calculation;
Calculate E-DPCCH correlation function submodule, be used for going out the correlation function of E-DPCCH according to the E-DPCCH channel calculation.
3, multipath as claimed in claim 2 is characterized in that, described calculating E-DPCCH correlation function submodule comprises:
E-DPCCH coherent integration device is used for calculating the coherent integration of E-DPCCH, the symbol that obtains behind the output E-DPCCH channel coherent accumulation;
The E-DPCCH non-coherent integrator is used for the symbol behind the E-DPCCH channel coherent accumulation is carried out noncoherent accumulation, is output as the correlation function of E-DPCCH.
4, multipath as claimed in claim 2 is characterized in that, described E-DPCCH coherent integration device is further divided into:
The descrambling submodule carries out descrambling to antenna data and the known scrambler that receives; The despreading submodule carries out despreading to data and known spreading code after the descrambling; Cache sub-module is carried out buffer memory to the symbol after the despreading, waits for E-DPCCH hard decision or decode results; Symbol depolarization submodule is after hard decision or decode results arrival, to the symbol depolarization of buffer memory symbol with E-DPCCH hard decision or decoding; The coherent accumulation submodule, the some symbols after the depolarization are added up obtains symbol behind the E-DPCCH channel coherent accumulation.
As claim 2 or 3 described multipaths, it is characterized in that 5, described E-DPCCH non-coherent integrator is further divided into:
Amplitude or power calculation submodule, sign computation amplitude or power that the coherent accumulation that described E-DPCCH coherent integration device is exported obtains; The noncoherent accumulation submodule, the amplitude of several slots or power results added up obtains the correlation function of DPCCH.
6, multipath as claimed in claim 1 is characterized in that, described correlation function combiner comprises:
First calculating sub module is used to obtain the correlation function ADP_c of DPCCH, calculates maximum ADPmax_c and the average ADPmean_c of correlation function ADP_c according to the correlation function ADP_c of DPCCH;
Second calculating sub module is used to obtain E-DPCCH correlation function ADP_ec, calculates maximum ADPmax_ec and the average ADPmean_ec of correlation function ADP_ec according to the correlation function ADP_ec of E-DPCCH;
Comparison sub-module is used to judge whether following formula is set up:
ADPmax_ec*ADPmean_c＞ADPmax_c*ADPmean_ec，
If set up, then indicate the assignment submodule to give final correlation function ADP_final with the ADP_ec assignment; If be false, then indicate the assignment submodule to give final correlation function ADP_final with the ADP_c assignment.
7, multipath as claimed in claim 1 is characterized in that, the multipath information of described multipath interpolating module output is the multipath information of 1/4 chip, 1/8 chip, 1/16 chip or 1/32 chip precision.
8, a kind of method of Multipath searching is characterized in that, comprises the steps:
Steps A. Dedicated Physical Control Channel (DPCCH) is carried out the correlation function that coherent integration and non-coherent integration calculate the DPCCH channel, carry out the correlation function that coherent integration and non-coherent integration obtain the E-DPCCH channel strengthening Dedicated Physical Control Channel (E-DPCCH);
Step B. calculates or selects to obtain final correlation function according to the correlation function of DPCCH channel and the correlation function of E-DPCCH channel;
Step C. calculates peak value threshold according to described final correlation function, and carries out peak value and detect the multipath information that obtains 0.5 chip precision;
Step D. carries out interpolation to the multipath of 0.5 chip precision and obtains multipath information;
Step e. carry out search window according to the multipath information of step D output and follow the tracks of, along with search window position is dynamically adjusted in the drift of multipath;
Step F. multipath set and historical multipath set carrying out multipath to this search merge, and obtain final multipath set, and export to receiver.
9, method as claimed in claim 8 is characterized in that,
In the described steps A, the Dedicated Physical Control Channel (E-DPCCH) that strengthens is carried out the step that coherent integration and non-coherent integration obtain the correlation function of E-DPCCH channel, specifically is divided into again:
A3, according to the symbol after antenna data, scrambler, E-DPCCH spreading code, E-DPCCH hard decision or the decoding, utilize the coherent integration device to calculate the coherent integration of E-DPCCH, the symbol that obtains behind the output E-DPCCH channel coherent accumulation;
A4, utilize non-coherent integrator, the symbol behind the E-DPCCH channel coherent accumulation is carried out noncoherent accumulation, be output as the correlation function of E-DPCCH.
10, method as claimed in claim 9 is characterized in that, described steps A 3 specifically comprises:
Antenna data and the known scrambler that receives carried out descrambling;
Data and known spreading code after the descrambling are carried out despreading;
Symbol after the despreading is carried out buffer memory, wait for E-DPCCH hard decision or decode results;
After hard decision or decoding arrive, the symbol depolarization that the buffer memory symbol is obtained with E-DPCCH hard decision or decoding;
Some symbols after the depolarization are added up obtain symbol behind the E-DPCCH channel coherent accumulation.
As claim 9 or 10 described methods, it is characterized in that 11, described steps A 4 specifically comprises:
Sign computation amplitude or power that described coherent accumulation is obtained;
The amplitude of several slots or power results added up obtain the correlation function of DPCCH.
12, method as claimed in claim 8 is characterized in that, specifically comprises among the described step B:
Step B1:
Obtain the correlation function ADP_c of DPCCH, calculate maximum ADPmax_c and the average ADPmean_c of correlation function ADP_c according to the correlation function ADP_c of DPCCH;
Obtain E-DPCCH correlation function ADP_ec, calculate maximum ADPmax_ec and the average ADPmean_ec of correlation function ADP_ec according to the correlation function ADP_ec of E-DPCCH;
Step B2: judge relatively whether following formula is set up:
ADPmax_ec*ADPmean_c＞ADPmax_c*ADPmean_ec，
If set up, then give final correlation function ADP_final with the ADP_ec assignment; If be false, then give final correlation function ADP_final with the ADP_c assignment.
13, method as claimed in claim 8 is characterized in that, the multipath information of exporting among the described step D is the multipath information of 1/4 chip, 1/8 chip, 1/16 chip or 1/32 chip precision.
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| US7113538B1 (en) * | 2000-11-01 | 2006-09-26 | Nortel Networks Limited | Time diversity searcher and scheduling method |
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