CN1870451A - RAKE receiving method and RAKE receiver using the method - Google Patents
RAKE receiving method and RAKE receiver using the method Download PDFInfo
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- CN1870451A CN1870451A CNA2005100719735A CN200510071973A CN1870451A CN 1870451 A CN1870451 A CN 1870451A CN A2005100719735 A CNA2005100719735 A CN A2005100719735A CN 200510071973 A CN200510071973 A CN 200510071973A CN 1870451 A CN1870451 A CN 1870451A
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Abstract
This invention discloses a RAKE receiving method applied by mobile terminals and a RAKE receiver using this method, in which, said method includes: applying harass codes of different areas and a public pilot symbol sequence to carry out multi-path search to the received digital sample signals to get a multi-path time delay of multi-path signal of each branch, then utilizing multiple RAKE receiving branches to spread the signals of the paths, estimate channels and rectify the deviation of the channels to get output data sequences of the RAKE receiving branches, which estimate the channels based on the down public and special pilot signals of the branches to merge the output sequences of the branches to get the receiving signals of mobile terminals.
Description
Technical field
The present invention relates to the Data Receiving technology of wireless communication system, specially refer to the RAKE method of reseptance that a kind of portable terminal adopts, and the RAKE receiver of this method of application.
Background technology
It is a kind of diversity receiving method that code division multiple access system generally adopts that RAKE receives, described RAKE receives the multipath effect that has made full use of radio communication, multipath signal to each road carries out demodulation respectively, and then stack output, therefore can obtain best receptivity by rake.The receiver of using RAKE method of reseptance reception data is called RAKE receiver.
In existing mobile communications system, base station and portable terminal all can use described RAKE method of reseptance to receive wireless signal, to reach the purpose that strengthens reception.The RAKE method of reseptance that known portable terminal adopts mainly may further comprise the steps:
A, distinguishing after the received signal of different districts, the signal to each sub-district carries out Multipath searching respectively, obtains the multidiameter delay of each each multipath signal of sub-district.
Owing to support the soft handover function such as wireless communication systems such as code division multiple access system, width code division multiple access system and time division duplexing synchronous CDMA systems, therefore, the portable terminal of these wireless communication systems also will receive the multipath signal of other sub-districts except the multipath signal that will receive this sub-district.
B, to each sub-district, the multidiameter delay of each multipath signal that obtains according to search uses a plurality of RAKE receiving branchs respectively each multipath signal to be carried out demodulation.
Described demodulation comprises: each RAKE receiving branch carries out despreading, channel estimating and channel rotation correction processing in proper order to the multipath signal of this branch road.
Wherein, described channel estimating is exactly the channel fading factors A e that estimates this RAKE receiving branch according to the multipath signal of this branch road
J ω, comprising: amplitude factor A and phase factor e
J ω
The method of described channel rotation correction is: at first, and the channel fading factors A e that channel estimating is obtained
J ωGet conjugation, and then will get the channel fading factors A e after the conjugation
-j ωCarry out product calculation with the data sequence after the despreading.It will be appreciated by those skilled in the art that, channel rotation correction recited above, can correct on the one hand because the receiving data sequence phase place rotation that channel fading caused also is equivalent to according to the amplitude A of each RAKE receiving branch channel fading factor the data sequence of each RAKE receiving branch output be carried out amplitude weighting on the other hand.That is to say, after above-mentioned channel rotation correction processing, the phase place basically identical of each RAKE receiving branch dateout sequence, and the weight of the multipath signal weighting that signal amplitude is big is big, the weight of the multipath signal weighting that signal amplitude is little is little, so that realize best merging effect when each multipath signal merges.
C, the data sequence that each RAKE receiving branch is exported merge, and obtain the receiving data sequence of portable terminal.
This step is described to be merged into: the data sequence of each RAKE receiving branch output is alignd in time according to radio frames and time slot position, then by corresponding position addition, obtain the receiving data sequence of portable terminal.
Because, in the described channel rotation correction process of above-mentioned steps B, the data sequence of each RAKE receiving branch output has been carried out amplitude weighting according to the amplitude of each RAKE receiving branch channel fading factor, therefore, in this step, directly, in fact just realized that so-called high specific merges with the data sequence addition of each RAKE receiving branch output.Can prove in theory, each road multipath signal be carried out high specific merge the receptivity that can obtain the best.
From above-mentioned RAKE receiving course as can be seen, in order to realize that RAKE receives accurately, the accuracy of each RAKE receiving branch channel estimating is vital.Generally speaking, RAKE receives and can utilize down-bound pilot frequency signal to carry out channel estimating, its reason is: the power of down-bound pilot frequency signal is relatively strong, and the symbol sebolic addressing of down-bound pilot frequency signal is known to portable terminal, the relevant processing of long period can be done, thereby the accuracy of channel estimating can be improved.Down-bound pilot frequency signal is divided into two kinds of common pilot signal and dedicated pilot signals, wherein, the power of dedicated pilot signal relatively a little less than, and be discontinuous emission, and the power of common pilot signal is stronger relatively, for example, usually account for 10% of sub-district maximum transmission power, and be to launch continuously, therefore, comparatively speaking, use common pilot signal can carry out the coherent reception of longer time, realize that more precise channels estimates that therefore, traditional RAKE method of reseptance generally all adopts common pilot signal to carry out the channel estimating of multipath signal.
Fig. 1 (a) has shown the RAKE receiver of using above-mentioned RAKE method of reseptance.Shown in Fig. 1 (a), the RAKE receiver of existing portable terminal mainly comprises: an above sub-district RAKE receiver module, and N sub-district RAKE receiver module for example, N is the natural number greater than 1, and the signal combiner.Wherein, described sub-district RAKE receiver module is used for distinguishing from the digital sampled signal that receives the multipath signal of this sub-district, and the multipath signal of this sub-district is carried out RAKE receive, obtain the data sequence of each RAKE receiving branch output of this sub-district, and output in the described signal combiner; The data sequence that described signal combiner is used for exporting from each RAKE receiving branch of all sub-district RAKE receiver modules merges, and obtains the receiving sequence of this portable terminal.
Fig. 1 (b) has shown the internal structure of RAKE receiver module in sub-district in the above-mentioned RAKE receiver.Shown in Fig. 1 (b), described sub-district RAKE receiver module further comprises: multipath and more than one RAKE receiving branch, and M RAKE receiving branch for example, M is the natural number greater than 1.Wherein, described multipath is used for searching for from digital sampled signal the multidiameter delay of each multipath signal in this sub-district, and the multidiameter delay that searches is outputed to respectively in the described more than one RAKE receiving branch; Described RAKE receiving branch is according to the multidiameter delay that receives, and the digital sampled signal of input, signal to each RAKE receiving branch carries out demodulation respectively, obtains the data sequence of each RAKE receiving branch output, and outputs to described signal combiner and carry out signal and merge.
Fig. 1 (c) has shown the internal structure of above-mentioned RAKE receiving branch.Shown in Fig. 1 (c), described RAKE receiving branch comprises dedicated channel despread unit, public guide frequency despread unit, channel estimating unit and channel rotation correction unit.Wherein, described dedicated channel despread unit adopts channel code and this cell scrambling of dedicated channel, digital sampled signal to input is carried out despreading, obtain the exclusive data sequence that this RAKE receiving branch signal carries on dedicated channel, the data sequence after the despreading is outputed in the described channel rotation correction unit then; Channel code and this cell scrambling that described public guide frequency despread unit adopts Common Pilot Channel carry out despreading to the digital sampled signal of input, then with the output of the common pilot signal after the despreading to described channel estimating unit; Described channel estimating unit is used for according to the common pilot signal that receives this RAKE receiving branch being carried out channel estimating, obtains the channel fading factor of this branch road, comprises amplitude factor and phase factor, outputs to described channel rotation correction unit; Described channel rotation correction unit is according to the fading factor of this RAKE receiving branch, correct the phase place of this RAKE receiving branch dateout sequence according to phase factor wherein, simultaneously, according to amplitude factor wherein the data sequence of this RAKE receiving branch output is carried out amplitude weighting.
From above-mentioned existing portable terminal RAKE method of reseptance and RAKE receiver shown in Figure 1 as can be seen, in non-soft handover scenario, because portable terminal receives only the signal of Serving cell, each RAKE receiving branch all utilizes the common pilot signal of Serving cell to carry out channel estimating, at this moment, the common pilot signal intensity that each RAKE receiving branch is received can reflect the relative signal intensity of each RAKE receiving branch multipath signal truly, therefore, in DRP data reception process, the amplitude factor of the channel fading factor of use common pilot signal is weighted the data sequence of each RAKE receiving branch, and then addition, be equivalent to realize the high specific merging in fact, thereby can obtain good receptivity.
But in soft handover scenario, portable terminal need receive the downstream signal of a plurality of sub-districts simultaneously, and the received signal of different districts is merged.At this moment, because power control is not carried out to the common pilot signal of self in each sub-district, therefore, its signal strength signal intensity and portable terminal are irrelevant, that is to say that portable terminal is at the true strong or weak relation of each road multipath signal between reflect mobile terminal and each sub-district of the strong or weak relation of the common pilot signal intensity of the different districts that each RAKE receiving branch is received.Like this, the size of amplitude factor in the employed channel fading factor when each road multipath signal is carried out amplitude weighting, the strong or weak relation that can not truly reflect multipath signal between each sub-district and the portable terminal, therefore, this weighting and follow-up merging process can not realize that the high specific of each multipath signal merges, thereby cause the deterioration of receptivity.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides the RAKE method of reseptance that a kind of portable terminal adopts, can be applied to simultaneously under the situation of soft handover and non-soft handover, realize that the high specific after the multipath signal demodulation merges, improve the receptivity of portable terminal.
The present invention also provides a kind of RAKE receiver of portable terminal, can be applied to simultaneously under the situation of soft handover and non-soft handover, can realize that the high specific after the multipath signal demodulation merges, and improves the receptivity of portable terminal.
The RAKE method of reseptance that portable terminal of the present invention adopts comprises:
A, the scrambler that adopts different districts and common pilot symbols sequence are carried out Multipath searching to the digital sampled signal that receives, and obtain the multidiameter delay of each road multipath signal in each sub-district;
Each road multipath signal in b, corresponding each sub-district, the multidiameter delay of each the road multipath signal that obtains according to search, use a plurality of RAKE receiving branchs respectively each road multipath signal to be carried out despreading, channel estimating and channel rotation correction and handle, obtain the dateout sequence of each RAKE receiving branch;
Wherein, each RAKE receiving branch carries out described channel estimating according to this subcircuit downlink common pilot signal and descending special pilot frequency signal;
C, the dateout sequence of each RAKE receiving branch is merged, obtain the received signal of portable terminal.
The described channel estimating of step b comprises:
Each RAKE receiving branch adopts the down public guide frequency signal of this RAKE receiving branch to carry out the phase estimation of channel respectively, obtains phase factor;
In the multipath signal of this RAKE receiving branch, extract the descending special pilot frequency signal, adopt described descending special pilot frequency signal to carry out amplitude Estimation, obtain amplitude factor;
Described phase factor and amplitude factor are multiplied each other, obtain the channel fading factor of this RAKE receiving branch.
Phase estimation of the present invention comprises: according to pre-configured down public guide frequency symbol sebolic addressing, the down public guide frequency signal that receives from this RAKE receiving branch is carried out coherent demodulation, obtain the channel fading factor of this RAKE receiving branch multipath signal, comprise amplitude factor and phase factor, keep phase factor wherein.
Coherent demodulation of the present invention is: a time slot internal symbol sequence is carried out coherent demodulation, or the symbol sebolic addressing in a plurality of time slots is carried out coherent demodulation.
The described amplitude Estimation of step b comprises:
B11, determine position and the number of this RAKE receiving branch descending special pilot frequency signal in each time slot according to the descending time slot form;
Position that b12, basis are determined and number extract the descending special pilot frequency signal of this time slot from the data sequence of each time slot of reception;
B13, the descending special pilot frequency signal that extracts and the pre-configured descending special pilot frequency symbol sebolic addressing in this time slot are carried out coherent demodulation, obtain the channel fading factor of this time slot multipath signal, comprise amplitude factor and phase factor, keep amplitude factor wherein.
Amplitude Estimation of the present invention further comprises:
B14, the amplitude factor of continuous a plurality of time slots is averaged or Filtering Processing, obtain the average amplitude factor of this RAKE receiving branch.
The described channel rotation correction of step b comprises:
B21, the channel fading factor that channel estimating is obtained are got conjugation;
B22, will get the channel fading factor after the conjugation and the data sequence after the despreading is carried out product calculation.
Step c is described to be merged into: the data sequence of each RAKE receiving branch output is alignd in time according to radio frames and time slot position, then by corresponding position addition, obtain the receiving data sequence of portable terminal.
The RAKE receiver that is applied to portable terminal of the present invention comprises:
An above sub-district RAKE receiver module is used for distinguishing the multipath signal of this sub-district from the digital sampled signal that receives, and carries out multipath reception, obtains multichannel dateout sequence, and output;
And the signal combiner, be used for the multichannel dateout sequence from each sub-district RAKE receiver module is merged, obtain the receiving sequence of this portable terminal;
Wherein, described sub-district RAKE receiver module comprises:
Multipath is used for the multidiameter delay of each multipath signal from this sub-district of digital sampled signal search, and outputs in the more than one RAKE receiving branch;
And more than one RAKE receiving branch, be used for respectively each multipath signal being carried out demodulation according to the multidiameter delay that receives and the digital sampled signal of input, obtain the dateout sequence of this RAKE receiving branch, and output to described signal combiner;
Wherein, described RAKE receiving branch comprises: dedicated channel despread unit, dedicated pilot acquiring unit, amplitude Estimation unit, public guide frequency despread unit, phase estimation unit, fading factor generation unit and channel rotation correction unit;
Described dedicated channel despread unit adopts the channel code of dedicated channel and the scrambler of this sub-district, digital sampled signal to input is carried out despreading, obtain this RAKE receiving branch signal data carried by data sequence on dedicated channel, output to described dedicated pilot acquiring unit and described channel rotation correction unit then simultaneously;
Described dedicated pilot acquiring unit is used for obtaining dedicated pilot signal from the dedicated channel data sequence that receives, and sends to described amplitude Estimation unit;
Described amplitude Estimation unit is used for the dedicated pilot signal that receives is carried out amplitude Estimation, obtains the amplitude factor of this RAKE receiving branch channel fading, and sends to described fading factor generation unit;
Channel code and this cell scrambling that described public guide frequency despread unit adopts Common Pilot Channel carry out despreading to the digital sampled signal of input, obtain the common pilot signal of this sub-district, then output to described phase estimation unit;
Described phase estimation unit is used for carrying out phase estimation according to the common pilot signal of public guide frequency despread unit output, obtains the phase factor of this RAKE receiving branch channel fading, and sends to described fading factor generation unit;
Described fading factor generation unit is used for calculating the current channel fading factor according to the phase factor and the amplitude factor that receive, and outputs to the channel rotation correction unit;
Described channel rotation correction unit is used for carrying out channel rotation correction according to the fading factor of this RAKE receiving branch, and the data sequence after will rectifying a deviation outputs to described signal combiner.
This shows, RAKE method of reseptance of the present invention and RAKE receiver can utilize the down public guide frequency signal to carry out the phase estimation of RAKE receiving branch on the one hand, make full use of down public guide frequency signal characteristics strong and that launch continuously, can adopt long coherence length to guarantee the accuracy of RAKE receiving branch phase estimation, thereby guarantee good channel rotation correction effect, improve the receptivity of portable terminal;
On the other hand, RAKE method of reseptance of the present invention and RAKE receiver utilize descending special pilot frequency to carry out the amplitude Estimation of multipath channel, make full use of the characteristics that the descending special pilot frequency signal can truly reflect each multipath signal strength, guarantee the accuracy of multipath channel amplitude Estimation, thereby make no matter under the situation of soft handover or non-soft handover, the despread signal of RAKE receiving branch is carried out the operation of amplitude weighting and merging, in fact all realized high specific merging, thereby made portable terminal obtain good receptivity all multipath signals of portable terminal.
Description of drawings
Fig. 1 (a) has shown existing portable terminal RAKE receiver;
Fig. 1 (b) has shown shown in Fig. 1 (a) internal structure of sub-district RAKE receiver module in the RAKE receiver;
Fig. 1 (c) has shown the internal structure of RAKE receiving branch shown in Fig. 1 (b);
Fig. 2 is the flow chart of portable terminal RAKE method of reseptance of the present invention;
Fig. 3 (a) has shown portable terminal RAKE receiver of the present invention;
Fig. 3 (b) has shown shown in Fig. 3 (a) internal structure of sub-district RAKE receiver module in the RAKE receiver;
Fig. 3 (c) has shown the internal structure of RAKE receiving branch shown in Fig. 3 (b).
Embodiment
Describe RAKE method of reseptance of the present invention and RAKE receiver in detail below in conjunction with accompanying drawing and the preferred embodiments of the present invention.
Consider that existing RAKE method of reseptance is applied in the basic reason that occurs the receptivity deterioration under the case of soft handover and is: the strong or weak relation between the down public guide frequency signal strength signal intensity of the different districts that portable terminal received can not truly reflect the strong or weak relation between the multipath signal between each sub-district and this portable terminal, make when each road multipath signal is carried out amplitude weighting the size of amplitude factor in the employed fading factor can not reflect the strong or weak relation between the intensity of each multipath signal really, thereby portable terminal can't realize that data carried by data on each road multipath signal dedicated channel is carried out desirable high specific to be merged, and causes the deterioration of receptivity.
Those of ordinary skill in the art are appreciated that, because the transmitting power of the transmitting power of descending special pilot frequency signal and user's dedicated channel signal is proportional, and all be subjected to the influence of equal-wattage control, the intensity that can truly reflect each road multipath signal between each sub-district and the portable terminal, therefore, can make full use of the descending special pilot frequency signal that portable terminal received and carry out channel estimating on each RAKE receiving branch, accurately obtain the amplitude factor of each RAKE receiving branch.
Based on above content, the invention provides a kind of RAKE method of reseptance, its main thought is: for each RAKE receiving branch of each sub-district, the down public guide frequency signal that uses this sub-district to use carries out the phase estimation of channel, obtain phase factor, and from this branch road multipath signal, extract the descending special pilot frequency signal, carry out amplitude Estimation, obtain amplitude factor, phase factor and the amplitude factor that obtains with estimation carried out channel rotation correction again, obtain the data sequence of this RAKE receiving branch output, the data sequence that all RAKE receiving branchs of all sub-districts are exported merges then, obtains the receiving data sequence of portable terminal.
Fig. 2 has shown the RAKE method of reseptance that portable terminal of the present invention adopted.As shown in Figure 2, this method mainly may further comprise the steps:
A, the scrambler that adopts different districts and common pilot symbols sequence are carried out Multipath searching to the digital sampled signal that receives, and obtain the multidiameter delay of each road multipath signal in each sub-district.
Each road multipath signal of b, corresponding each sub-district, the multidiameter delay of each the road multipath signal that obtains according to search, use a plurality of RAKE receiving branchs respectively each road multipath signal to be carried out despreading, channel estimating and channel rotation correction in proper order and handle, obtain the dateout sequence of each RAKE receiving branch;
Wherein, each RAKE receiving branch is carried out channel estimating according to this subcircuit downlink common pilot signal and descending special pilot frequency signal to the multipath signal on this branch road.
Described channel estimating comprises: in each RAKE receiving branch, adopt the down public guide frequency signal of this RAKE receiving branch to carry out the phase estimation of channel, obtain phase factor, and in the multipath signal of this branch road, extract the descending special pilot frequency signal and carry out amplitude Estimation and obtain amplitude factor, comprehensive described phase factor and amplitude factor obtain the channel fading factor of this RAKE receiving branch.
Above-mentioned phase estimation is specially: according to pre-configured down public guide frequency symbol sebolic addressing, the down public guide frequency signal that receives from this RAKE receiving branch is carried out coherent demodulation, obtain the channel fading factor of this branch road multipath signal, comprise amplitude factor and phase factor e
J ω, get phase factor e wherein
J ωWherein, described coherent demodulation can be that the symbol sebolic addressing to a time slot carries out coherent demodulation, also can carry out coherent demodulation to the symbol sebolic addressing of a plurality of time slots.
Above-mentioned amplitude Estimation is specially: determine position and the number of descending special pilot frequency signal in each time slot according to the descending time slot form, from the data sequence of each time slot of receiving, extract the descending special pilot frequency signal of this time slot, descending special pilot frequency symbol sebolic addressing with pre-configured this time slot carries out coherent demodulation then, obtain the channel estimating of this time slot multipath signal, it is the channel fading factor, comprise amplitude factor A and phase factor, and get amplitude factor A wherein.In above-mentioned channel estimation process, can average the amplitude factor of continuous a plurality of time slots or filtering, obtain the average amplitude factor of this RAKE receiving branch.
The concrete grammar of the described channel rotation correction of this step and the method for prior art are basic identical, comprising: at first, and the phase factor e that obtains with the phase estimation process
J ωAnd the amplitude factor A that obtains of the amplitude Estimation process channel fading factors A e that multiplies each other and calculate this RAKE receiving branch
J ω, again the channel fading factor is got conjugation, will get the channel fading factor after the conjugation and the data sequence after the despreading then and carry out product calculation.
Above-mentioned channel rotation correction is handled each RAKE receiving branch dateout sequence has been carried out phase place adjustment and amplitude weighting.
C, behind channel rotation correction, the data sequence of each RAKE receiving branch output is merged, obtain the received signal of portable terminal.
The described merging of this step is specially: the data sequence of each RAKE receiving branch output is alignd in time according to radio frames and time slot position, then by corresponding position addition, obtain the receiving data sequence of portable terminal.
Owing to be to utilize the descending special pilot frequency signal of each RAKE receiving branch to carry out amplitude Estimation in above-mentioned channel estimation process, therefore, the magnitude relationship of amplitude factor can truly reflect the strong or weak relation between each road multipath signal in each RAKE receiving branch channel fading factor, thereby the above-mentioned process that each road multipath signal is carried out amplitude weighting and merging, just be equivalent to realize that each the road multipath signal to each sub-district carries out the high specific merging, therefore, can guarantee good receptivity.
The present invention also provides a kind of portable terminal RAKE receiver that above-mentioned RAKE method of reseptance carries out the RAKE reception of using.
Fig. 3 (a) has shown the structure of RAKE receiver of the present invention.Shown in Fig. 3 (a), described RAKE receiver mainly comprises: an above sub-district RAKE receiver module, and N sub-district RAKE receiver module for example, N is the natural number greater than 1, and the signal combiner.Wherein, described sub-district RAKE receiver module is used for from the digital sampled signal that receives from distinguishing the multipath signal of this sub-district, and carries out multipath reception, obtains multichannel dateout sequence, and outputs in the described signal combiner; Described signal combiner will merge from the multichannel dateout sequence of each sub-district RAKE receiver module, obtains the receiving sequence of this portable terminal.
Fig. 3 (b) has shown the internal structure of RAKE receiver module in sub-district in the above-mentioned RAKE receiver.Shown in Fig. 3 (b), described sub-district RAKE receiver module further comprises: multipath and more than one RAKE receiving branch, and M RAKE receiving branch for example, M is the natural number greater than 1.Wherein, described multipath is used for the multidiameter delay of each multipath signal from this sub-district of digital sampled signal search, and the multidiameter delay that searches is outputed to respectively in the described more than one RAKE receiving branch; Described RAKE receiving branch is according to the multidiameter delay that receives, and the digital sampled signal of input, respectively each multipath signal is carried out demodulation, obtains the dateout sequence of this RAKE receiving branch, and outputs to described signal combiner.
Fig. 3 (c) has shown the internal structure of above-mentioned RAKE receiving branch.Shown in Fig. 3 (c), described RAKE receiving branch comprises dedicated channel despread unit, dedicated pilot acquiring unit, amplitude Estimation unit, public guide frequency despread unit, phase estimation unit, fading factor generation unit and channel rotation correction unit.
Wherein, described dedicated channel despread unit adopts the channel code of dedicated channel and the scrambler of this sub-district, digital sampled signal to input is carried out despreading, obtain this RAKE receiving branch signal data carried by data sequence on dedicated channel, then the data sequence after the despreading is outputed to simultaneously described dedicated pilot acquiring unit and described channel rotation correction unit;
Described dedicated pilot acquiring unit is used for obtaining dedicated pilot signal from the dedicated channel data sequence that receives, and the dedicated pilot signal that obtains is sent to described amplitude Estimation unit;
Described amplitude Estimation unit is used for the dedicated pilot signal that receives is carried out amplitude Estimation, obtains the amplitude factor of this RAKE receiving branch channel fading factor, and described amplitude factor is sent to described fading factor generation unit;
The scrambler that described public guide frequency despread unit is adopted the channel code of Common Pilot Channel and this sub-district carries out despreading to the digital sampled signal of input, obtains the common pilot signal of this sub-district, then with common pilot signal output to described phase estimation unit;
Described phase estimation unit is used for carrying out phase estimation according to the common pilot signal of public guide frequency despread unit output, obtains the phase factor of this RAKE receiving branch, and described phase factor is sent to described fading factor generation unit;
Described fading factor generation unit calculates the current channel fading factor according to the phase factor and the amplitude factor that receive, and outputs to the channel rotation correction unit;
Described channel rotation correction unit is used for carrying out channel rotation correction according to the fading factor of this RAKE receiving branch, in the phase place of correcting this RAKE receiving branch dateout sequence, data sequence to the output of this RAKE receiving branch is carried out amplitude weighting, outputs to described signal combiner then.
This shows, RAKE method of reseptance of the present invention and RAKE receiver utilize the down public guide frequency signal of each sub-district to carry out the phase estimation of each road multipath signal on the one hand, on the other hand, RAKE method of reseptance of the present invention and RAKE receiver utilize descending special pilot frequency in each road multipath signal to carry out the amplitude Estimation of each road multipath signal, make full use of the characteristics of down public guide frequency signal and descending special pilot frequency signal, guarantee the accuracy of multipath signal phase estimation and amplitude Estimation, thereby traditional RAKE method of reseptance and the defective of RAKE receiver under case of soft handover have been overcome, the high specific of having realized each sub-district multipath signal under the case of soft handover merges, and therefore has better receptivity.
Need to prove that RAKE method of reseptance of the present invention and RAKE receiver go for code division multiple access system, broadband CDMA system and time division duplexing synchronous CDMA system or the like wireless communication system.
Claims (9)
1, a kind of RAKE method of reseptance of portable terminal employing is characterized in that described method comprises:
A, the scrambler that adopts different districts and common pilot symbols sequence are carried out Multipath searching to the digital sampled signal that receives, and obtain the multidiameter delay of each road multipath signal in each sub-district;
Each road multipath signal in b, corresponding each sub-district, the multidiameter delay of each the road multipath signal that obtains according to search, use a plurality of RAKE receiving branchs respectively each road multipath signal to be carried out despreading, channel estimating and channel rotation correction and handle, obtain the dateout sequence of each RAKE receiving branch;
Wherein, each RAKE receiving branch carries out described channel estimating according to this subcircuit downlink common pilot signal and descending special pilot frequency signal;
C, the dateout sequence of each RAKE receiving branch is merged, obtain the received signal of portable terminal.
2, the method for claim 1 is characterized in that, the described channel estimating of step b comprises:
Each RAKE receiving branch adopts the down public guide frequency signal of this RAKE receiving branch to carry out the phase estimation of channel respectively, obtains phase factor;
In the multipath signal of this RAKE receiving branch, extract the descending special pilot frequency signal, adopt described descending special pilot frequency signal to carry out amplitude Estimation, obtain amplitude factor;
Described phase factor and amplitude factor are multiplied each other, obtain the channel fading factor of this RAKE receiving branch.
3, method as claimed in claim 2, it is characterized in that, described phase estimation comprises: according to pre-configured down public guide frequency symbol sebolic addressing, the down public guide frequency signal that receives from this RAKE receiving branch is carried out coherent demodulation, obtain the channel fading factor of this RAKE receiving branch multipath signal, comprise amplitude factor and phase factor, keep phase factor wherein.
4, method as claimed in claim 3 is characterized in that, described coherent demodulation is: a time slot internal symbol sequence is carried out coherent demodulation, or the symbol sebolic addressing in a plurality of time slots is carried out coherent demodulation.
5, method as claimed in claim 2 is characterized in that, the described amplitude Estimation of step b comprises:
B11, determine position and the number of this RAKE receiving branch descending special pilot frequency signal in each time slot according to the descending time slot form;
Position that b12, basis are determined and number extract the descending special pilot frequency signal of this time slot from the data sequence of each time slot of reception;
B13, the descending special pilot frequency signal that extracts and the pre-configured descending special pilot frequency symbol sebolic addressing in this time slot are carried out coherent demodulation, obtain the channel fading factor of this time slot multipath signal, comprise amplitude factor and phase factor, keep amplitude factor wherein.
6, method as claimed in claim 5 is characterized in that, described amplitude Estimation further comprises:
B14, the amplitude factor of continuous a plurality of time slots is averaged or Filtering Processing, obtain the average amplitude factor of this RAKE receiving branch.
7, the method for claim 1 is characterized in that, the described channel rotation correction of step b comprises:
B21, the channel fading factor that channel estimating is obtained are got conjugation;
B22, will get the channel fading factor after the conjugation and the data sequence after the despreading is carried out product calculation.
8, the method for claim 1, it is characterized in that, step c is described to be merged into: the data sequence of each RAKE receiving branch output is alignd in time according to radio frames and time slot position, then by corresponding position addition, obtain the receiving data sequence of portable terminal.
9, a kind of RAKE receiver that is applied to portable terminal is characterized in that, this RAKE receiver comprises:
An above sub-district RAKE receiver module is used for distinguishing the multipath signal of this sub-district from the digital sampled signal that receives, and carries out multipath reception, obtains multichannel dateout sequence, and output;
And the signal combiner, be used for the multichannel dateout sequence from each sub-district RAKE receiver module is merged, obtain the receiving sequence of this portable terminal;
Wherein, described sub-district RAKE receiver module comprises:
Multipath is used for the multidiameter delay of each multipath signal from this sub-district of digital sampled signal search, and outputs in the more than one RAKE receiving branch;
And more than one RAKE receiving branch, be used for respectively each multipath signal being carried out demodulation according to the multidiameter delay that receives and the digital sampled signal of input, obtain the dateout sequence of this RAKE receiving branch, and output to described signal combiner;
Wherein, described RAKE receiving branch comprises: dedicated channel despread unit, dedicated pilot acquiring unit, amplitude Estimation unit, public guide frequency despread unit, phase estimation unit, fading factor generation unit and channel rotation correction unit;
Described dedicated channel despread unit adopts the channel code of dedicated channel and the scrambler of this sub-district, digital sampled signal to input is carried out despreading, obtain this RAKE receiving branch signal data carried by data sequence on dedicated channel, output to described dedicated pilot acquiring unit and described channel rotation correction unit then simultaneously;
Described dedicated pilot acquiring unit is used for obtaining dedicated pilot signal from the dedicated channel data sequence that receives, and sends to described amplitude Estimation unit;
Described amplitude Estimation unit is used for the dedicated pilot signal that receives is carried out amplitude Estimation, obtains the amplitude factor of this RAKE receiving branch channel fading, and sends to described fading factor generation unit;
Channel code and this cell scrambling that described public guide frequency despread unit adopts Common Pilot Channel carry out despreading to the digital sampled signal of input, obtain the common pilot signal of this sub-district, then output to described phase estimation unit;
Described phase estimation unit is used for carrying out phase estimation according to the common pilot signal of public guide frequency despread unit output, obtains the phase factor of this RAKE receiving branch channel fading, and sends to described fading factor generation unit;
Described fading factor generation unit is used for calculating the current channel fading factor according to the phase factor and the amplitude factor that receive, and outputs to the channel rotation correction unit;
Described channel rotation correction unit is used for carrying out channel rotation correction according to the fading factor of this RAKE receiving branch, and the data sequence after will rectifying a deviation outputs to described signal combiner.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104561311A (en) * | 2015-01-04 | 2015-04-29 | 北京大学第三医院 | Kit of birth security prediction in human assisted reproductive embryonic early development |
| CN106231643A (en) * | 2016-07-14 | 2016-12-14 | 华为技术有限公司 | A kind of signal combining method and wireless terminal |
| CN110518921A (en) * | 2018-05-21 | 2019-11-29 | 北京松果电子有限公司 | The method, apparatus and storage medium and electronic equipment of multi-path combing |
| CN114221840A (en) * | 2021-12-31 | 2022-03-22 | 长沙驰芯半导体科技有限公司 | Ultra-wideband sparse channel estimation method in RAKE receiver |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1124715C (en) * | 2000-03-30 | 2003-10-15 | 华为技术有限公司 | Multi-path search method and device of CDMA communication system |
| GB2386038A (en) * | 2002-02-27 | 2003-09-03 | Motorola Inc | Channel estimation in a radio receiver |
| CN101471139A (en) * | 2002-11-25 | 2009-07-01 | 张国飙 | Design of three-dimensional memory device |
| WO2005006595A1 (en) * | 2003-07-14 | 2005-01-20 | Matsushita Electric Industrial Co., Ltd. | Radio reception method and communication terminal device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104561311A (en) * | 2015-01-04 | 2015-04-29 | 北京大学第三医院 | Kit of birth security prediction in human assisted reproductive embryonic early development |
| CN104561311B (en) * | 2015-01-04 | 2016-08-17 | 北京大学第三医院 | A kind of test kit of safety prediction of being born in early days from people's supplementary reproduction fetal development |
| CN106231643A (en) * | 2016-07-14 | 2016-12-14 | 华为技术有限公司 | A kind of signal combining method and wireless terminal |
| CN110518921A (en) * | 2018-05-21 | 2019-11-29 | 北京松果电子有限公司 | The method, apparatus and storage medium and electronic equipment of multi-path combing |
| CN110518921B (en) * | 2018-05-21 | 2021-05-04 | 北京小米松果电子有限公司 | Method, apparatus and storage medium for multipath combining and electronic device |
| CN114221840A (en) * | 2021-12-31 | 2022-03-22 | 长沙驰芯半导体科技有限公司 | Ultra-wideband sparse channel estimation method in RAKE receiver |
| CN114221840B (en) * | 2021-12-31 | 2023-11-24 | 长沙驰芯半导体科技有限公司 | Ultra-wideband sparse channel estimation method in RAKE receiver |
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