CN102281215A - Channel estimating method and device based on multi-cell parallel frequency domain disturbance elimination - Google Patents
Channel estimating method and device based on multi-cell parallel frequency domain disturbance elimination Download PDFInfo
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Abstract
The invention relates to channel estimating method and device based on multi-cell parallel frequency domain disturbance elimination, wherein the method comprises the following steps of receiving and storing midamble code time-domain data signal of training sequences of a plurality of cells; converting the midamble code time-domain data signal into a frequency domain data signal; performing disturbance elimination process to the frequency domain data signal according to a channel estimation iterated operation, and obtaining a channel estimating coefficient of each cell; and outputting the channel estimating coefficients of the cells. In the invention, the midamble code data signals received from the plurality of cells by the channel estimation iterated operation are performed parallel disturbance elimination process, thus, the hardware cost is reduced and the channel estimating precision is improved, meanwhile, the accuracy cell transmission path information can be obtained.
Description
Technical field
The present invention relates to the communications field, relate in particular to channel estimation methods and device in a kind of TD-SCDMA of being applied to baseband chip treatment system based on the parallel frequency domain interference elimination in many sub-districts.
Background technology
In the wireless mobile communications signal processing, need estimate the wireless channel transfer function of current demand signal transmission, promptly be referred to as channel estimating, so that terminal receives high-quality data message.For TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, TD SDMA) system, the characteristic that its channel estimation method is based on basic midamble sign indicating number (training sequence code) design and realize.
When in base station side emission data, except comprising the data of needs emission, also comprise/descending pilot frequency information and basic midamble code data (or the result after the cyclic shift) in each burst structure.Wherein: on/descending pilot frequency information is based on that Synchronization Design is considered and embeds, and the midamble sign indicating number inserts burst, then is that end side is carried out the channel estimating computing, recovered the original transmitted data and design for convenience, and its concrete processing procedure is as follows:
At first, user terminal UE (User Equipment, user terminal) side is learnt current sync DL sign indicating number (descending synchronous code) information and scrambling code information by CSR (Cell searching) process, utilizes its corresponding relation, can obtain the basic midamble sign indicating number information that current institute persistent district uses;
Then, the UE lateral root utilizes the channel estimating computing according to the data message of the midamble sign indicating number section that receives and the corresponding relation (auto-correlation) of basic midamble code data, estimates the channel transfer function of current demand signal, i.e. channel estimation coefficient;
At last, the UE lateral root is according to the channel estimation coefficient that obtains, and the tectonic system transmission matrix disturbs relevant counteracting, recovery, demodulation to the data that receive, and obtains the data original shape, has promptly finished the process of Data Receiving.
From above-mentioned processing procedure as can be seen, the channel estimation process of the UE of TD-SCDMA system receiving terminal is extremely crucial, and it affects the precision of system transmission matrix, and the terminal use is accurately extracted useful data and demodulation, and very important effect is arranged.
In existing most TD-SCDMA baseband chip treatment systems, the algorithm and the realization of relevant channel estimating, mentality of designing commonly used and method relate to the following aspects:
(1) for initial channel estimation procedure, or carries out, or carry out based on the frequency domain that receives data based on the time domain that receives data.The former directly adopts the relevant method of coupling to realize that its thinking is direct; Compare the former, the latter realizes that cost is higher, but operational precision is better;
(2) for the order of channel estimating computing, the counteracting serial interference that generally is based on single reception sub-district carries out in proper order;
(3), adopt based on carrying out noise reduction when the method for pre-treatment sub-district master footpath weighting noise reduction for the noise reduction process process;
(4) cross the signal reconstruction of Cheng Qian for Interference Cancellation, or based on the counteracting that receives the midamble code data, or based on the counteracting of receiving subscriber data numeric field data;
(5) for channel estimation process, the general employing based on the repeatedly iteration of transmitting the footpath algorithm for estimating, and define given iterations according to algorithm link channel model emulation.
But, about the design of channel estimating computing, be based on the coupling related operation of signal in the time domain mostly in the prior art, obtain peak information, thereby know the main footpath information of transfer function; The processing of its noise path filtering, noise reduction process is comparatively coarse.And, this kind processing method, because do not relate to the noise reduction process of disturbing the footpath, and there is not to pass through the repeatedly data processing of (configurable) iteration convergence computing, the channel estimation results precision that it obtained is not high, reduced the quality that belongs to this user useful signal that terminal extracts, and hardware implementation complexity degree, be not easy to the control of area resource.
Chinese patent CN200610118422.1 discloses a kind of counteracting serial interference method based on many sub-districts, is used for the channel estimating computing, and its principle is to utilize the auto-correlation of time domain data, obtains transmission footpath information by the contrast peak value.This kind processing method relates to auto-correlation, the matching operation of time domain data signal, and basic midamble sign indicating number sequence is longer, the waste hardware resource, and operational precision is not high; And the counteracting serial interference of many sub-districts that it adopts is handled, and can not include up-to-date adjacent sub-district reconfiguration information in Interference Cancellation, and the centre do not relate to noise reduction process and handle, and has lost precision of channel estimation.
Chinese patent CN200610117915.1 discloses a kind of method and apparatus that disturbs based on Parallel Interference Cancellation elimination common-frequency cell signal, for each sub-district, and its demodulation symbol reconstruct cell interfering signal by generating based on joint-detection; Again the signal after other interfered cell reconstruct is superposeed; The signal superposition value after other interfered cell reconstruct of removal from received signal is eliminated the influence of adjacent cell interfering signal to this sub-district received signal then; And, carry out above-mentioned steps repeatedly according to parallel progression.This kind processing method, based on the reconstruct neutralisation process of demodulation symbol, its precision is not as good as the processing accuracy based on reception midamble sign indicating number sequence, and the generation precision of its system transmission matrix can not get guaranteeing.
Chinese patent CN200680054983.0, disclose a kind of at the channel estimator that from the receiver node of a plurality of user terminal received signals, uses, wherein, distributed separately one group of transmitting subcarrier and test signal sequence separately for each described user terminal, to be used for by treating that estimated channel transmits, for single carrier wave frequency division multiple access (SC-FDMA) system, carry out frequency domain channel and estimate.This kind processing method mainly is a discrete spectrum information of utilizing test signal sequence, as the discrete spectrum of the test signal that makes up and the function of the discrete spectrum of the test signal sequence of distributing to user terminal, carries out channel estimating.The TD-SCDMA system can not be directly applied to, the design original intention of basic midamble sign indicating number sequence can not be utilized well.
Summary of the invention
Main purpose of the present invention is to provide a kind of channel estimation methods and device of eliminating based on the parallel frequency domain interference in many sub-districts, be intended to improve the precision of channel estimation of eliminating in the TD-SCDMA baseband chip treatment system in the parallel frequency domain interference process in many sub-districts, and reduce hardware cost.
A kind of channel estimation methods of eliminating based on the parallel frequency domain interference in many sub-districts that the present invention proposes may further comprise the steps:
Receive and store the training sequence midamble sign indicating number time domain data signal of a plurality of sub-districts;
With midamble sign indicating number time domain data conversion of signals is the frequency domain data signal;
By the iterative channel estimation computing frequency domain data signal is carried out parallel interference and eliminate processing, obtain each cell channel estimation coefficient;
Export each cell channel estimation coefficient.
Preferably, describedly by the iterative channel estimation computing frequency domain data signal is carried out the step that parallel interference eliminate to handle and specifically comprises:
Described frequency domain data signal is carried out interference-cancellation process;
Frequency domain data signal after the interference-cancellation process is carried out channel estimation process, obtain each cell channel estimation coefficient;
Judge whether the iterative channel estimation number of times reaches the predetermined configurations value, if then export each cell channel estimation coefficient; Otherwise
Each cell channel estimation coefficient is reconstructed processing, and obtains the frequency domain data signal after each sub-district reconstruct;
Frequency domain data signal after the reconstruction processing is merged processing, and enter step described frequency domain data signal is carried out interference-cancellation process.
Preferably, described frequency domain data signal after the interference-cancellation process is carried out channel estimation process, obtains also comprising after the step of each cell channel estimation coefficient:
With the frequency domain data conversion of signals after the described channel estimation process is the time domain data signal;
Described time domain data signal is united main footpath noise reduction process, obtain multipath information and each cell channel estimation coefficient after filter in main footpath;
Multipath information after the filtration of main footpath and each cell channel estimation coefficient are recovered to handle;
Multipath information after the recovery processing is carried out the frequency domain conversion.
Preferably, described after main footpath is filtered multipath information and each cell channel estimation coefficient step of recovering to handle after also comprise:
Multipath information after the recovery processing is carried out the noise power noise reduction process, and obtain multipath information and each cell channel estimation coefficient after noise path is filtered.
Preferably, describedly the frequency domain data signal is carried out also comprising before the step that parallel interference eliminate to handle by the iterative channel estimation computing:
The predetermined configurations value of iterative channel estimation number of times is set.
The present invention proposes a kind of channel estimating apparatus of eliminating based on the parallel frequency domain interference in many sub-districts, comprising:
Receive memory module, be used to receive and store the midamble sign indicating number time domain data signal of a plurality of sub-districts;
The time domain frequency domain modular converter, being used for midamble sign indicating number time domain data conversion of signals is the frequency domain data signal;
The interative computation processing module is used for by the iterative channel estimation computing frequency domain data signal being carried out parallel interference and eliminates processing, obtains each cell channel estimation coefficient;
Output module is used to export each cell channel estimation coefficient.
Preferably, described interative computation processing module specifically comprises:
The Interference Cancellation unit is used for described frequency domain data signal is carried out interference-cancellation process;
Channel estimating unit is connected the output of described Interference Cancellation unit, is used for the frequency domain data signal after the interference-cancellation process is carried out channel estimation process, obtains each cell channel estimation coefficient;
Judging unit is connected between described channel estimating unit and the output module, is used to judge whether the iterative channel estimation number of times reaches the predetermined configurations value;
Reconfiguration unit is connected the output of described judging unit, is used for each cell channel estimation coefficient is reconstructed processing, and obtains the frequency domain data signal after each sub-district reconstruct;
Merge cells is connected between described reconfiguration unit and the Interference Cancellation unit, is used for the frequency domain data signal after the reconstruction processing is merged processing.
Preferably, described interative computation processing module also comprises:
Time domain converting unit is connected described channel estimating unit output, and being used for the frequency domain data conversion of signals after the described channel estimation process is the time domain data signal;
Unite main footpath noise reduction unit, be connected described time domain converting unit output, be used for described time domain data signal is united main footpath noise reduction process, obtain multipath information and each cell channel estimation coefficient after filter in main footpath;
The channel estimation coefficient recovery unit is connected the described main footpath noise reduction unit output of uniting, and is used for multipath information after the filtration of main footpath and channel estimation coefficient are recovered to handle;
Frequency domain converting unit is connected between described channel estimation coefficient recovery unit and the judging unit, is used for the multipath information after the recovery processing is carried out the frequency domain conversion.
Preferably, described interative computation processing module also comprises:
The noise power noise reduction unit, be connected between described channel estimation coefficient recovery unit and the frequency domain converting unit, be used for the multipath information after the recovery processing is carried out the noise power noise reduction process, and obtain multipath information and each cell channel estimation coefficient after noise path is filtered.
Preferably, described device also comprises:
Module is set, is used to be provided with the predetermined configurations value of iterative channel estimation number of times.
Preferably, described reception memory module, the intermediate treatment result who also is used for receiving and storing described each functional unit of interative computation processing module.
The channel estimation methods and the device that the present invention is based on the parallel frequency domain interference elimination in many sub-districts have following beneficial effect compared to existing technology:
1, handles by the midamble sign indicating number training sequence that in frequency domain, terminal is received and transfer function is estimated computing, guarantee precision of channel estimation;
2, the Interference Cancellation process of many sub-districts is parallel processings, can make the up-to-date reconstruct interference of each sub-district include counteracting in, improves precision;
3, filter, filter this twice noise reduction process based on the effective diameter of uniting main footpath metric-threshold, obtain accurate as far as possible cell transmission footpath information based on the noise path of noise power;
4, the iterative channel estimation number of times is configurable, and under the environment with constant power cell transmission frequently particularly, the channel estimation results performance can restrain as early as possible, improves the processing speed of real time data.
Description of drawings
Fig. 1 the present invention is based on the channel estimation methods one embodiment schematic flow sheet that the parallel frequency domain interference in many sub-districts is eliminated;
Fig. 2 is the idiographic flow schematic diagram based on step 103 in the channel estimation methods of the parallel frequency domain interference elimination in many sub-districts shown in Figure 1;
Fig. 3 the present invention is based on another embodiment schematic flow sheet of channel estimation methods that the parallel frequency domain interference in many sub-districts is eliminated;
Fig. 4 the present invention is based on channel estimation methods that the parallel frequency domain interference in many sub-districts eliminates an embodiment schematic flow sheet again;
Fig. 5 is a channel estimating mathematical algorithm schematic flow sheet in the foregoing description;
Fig. 6 the present invention is based on the another embodiment schematic flow sheet of channel estimation methods that the parallel frequency domain interference in many sub-districts is eliminated;
Fig. 7 the present invention is based on the channel estimating apparatus one embodiment result schematic diagram that the parallel frequency domain interference in many sub-districts is eliminated;
Fig. 8 is an interative computation processing module concrete structure schematic diagram in the channel estimating apparatus of eliminating based on the parallel frequency domain interference in many sub-districts shown in Figure 7;
Fig. 9 the present invention is based on another example structure schematic diagram of channel estimating apparatus that the parallel frequency domain interference in many sub-districts is eliminated;
Figure 10 the present invention is based on channel estimating apparatus that the parallel frequency domain interference in many sub-districts eliminates an example structure schematic diagram again;
Figure 11 the present invention is based on the another example structure schematic diagram of channel estimating apparatus that the parallel frequency domain interference in many sub-districts is eliminated.
In order to make technical scheme of the present invention clearer, clear, be described in further detail below in conjunction with accompanying drawing.
Embodiment
The midamble code data signal that solution for embodiment of the invention mainly receives a plurality of sub-districts by the iterative channel estimation computing carries out parallel interference and eliminates processing, when reducing hardware cost, improve precision of channel estimation, to obtain accurate cell transmission footpath information.
One embodiment of the invention proposes a kind of channel estimation methods of eliminating based on the parallel frequency domain interference in many sub-districts, comprising:
Step 101 receives and stores the midamble sign indicating number time domain data signal of a plurality of sub-districts;
Step 102 is the frequency domain data signal with midamble sign indicating number time domain data conversion of signals;
In this step, midamble sign indicating number time domain data signal is carried out fast Fourier transform FFT, make it convert the frequency domain data signal to, thereby finish the conversion of midamble code data signal from the time domain to the frequency domain;
Step 103 is carried out parallel interference by the iterative channel estimation computing to the frequency domain data signal and is eliminated processing, obtains each cell channel estimation coefficient;
Step 104 is exported each cell channel estimation coefficient.
As shown in Figure 2, above-mentioned steps 103 specifically comprises:
With each the sub-district frequency domain data signal that is converted in the step 102, deduct each reconstructed frequency domain data-signal that receives sub-district (comprising) (for first round iteration in the interative computation when the pre-treatment sub-district, the initial reconstitution frequency domain data signal of each sub-district is 0) sum, promptly obtain the frequency domain data signal after the interference-cancellation process.
With the dot product reciprocal of the FFT transformation results of the basic midamble code data of each the sub-district frequency domain data signal after the interference-cancellation process and each respective cell, finish initial channel estimation procedure, obtain the channel estimation coefficient of each cell initial.Wherein, parallel the carrying out of a plurality of sub-districts frequency domain data signal in the process of channel estimating.
In the present embodiment, in the iterative channel estimation computing, predetermined configurations value that can a pre-configured iterations, the data-signal that each sub-district receives to 1035 calculation process, need carry out the judgement of an iterations, when the iterative channel estimation number of times reaches the predetermined configurations value through step 1031, be that channel estimation results meets predefined requirement, when also promptly reaching predefined precision of channel estimation, then export each cell channel estimation coefficient, finish the process of channel estimating.Otherwise, continue to enter next step 1034.
With each cell channel estimation coefficient through obtaining after the channel estimation process in the above-mentioned steps 1033,, obtain the frequency domain data signal of each sub-district reconstruct with the basic midamble code data dot product of its respective cell.
The frequency domain data signal of each sub-district reconstruct of obtaining in the above-mentioned steps 1034 is merged, and first round iterative channel estimation finishes, and prepares to enter the Parallel Interference Cancellation step in the computing of next round iterative channel estimation.Repeating step 1031 to 1035, so repeatedly interative computation when iterations reaches the preset configuration value, has promptly been finished channel estimation process, the channel estimation results that obtains each sub-district is a channel estimation coefficient, and exports last channel estimation results after step 1032.
Present embodiment carries out transfer function by the midamble sign indicating number that in frequency domain terminal is received and estimates computing, guarantees precision of channel estimation; The Interference Cancellation process parallel processing of many cell datas signal simultaneously can make the up-to-date reconstruct interference of each cell data signal include counteracting in, has improved data signal quality; Compared to existing technologies, the midamble code data signal that a plurality of sub-districts is received by the iterative channel estimation computing carries out parallel interference elimination processing, when reducing hardware cost, improved precision of channel estimation, can obtain accurate cell transmission footpath information.
As shown in Figure 3, another embodiment of the present invention proposes a kind of channel estimation methods of eliminating based on the parallel frequency domain interference in many sub-districts, on the basis of the foregoing description, wherein, also comprises after step 1032:
In this step, the frequency domain data signal after the channel estimation process is carried out inverse fast Fourier transform IFFT, make this frequency domain data signal finish conversion from frequency domain to time domain.
In this step, time domain data signal after the channel estimation process is carried out noise gate to be calculated, (data are real promptly the time domain data after the channel estimation process to be carried out each single footpath power calculation, the quadratic sum of imaginary part), compare its maximum, obtain uniting the noise power in main footpath, afterwards noise power-value is weighted, promptly obtain noise power threshold and promptly unite main footpath noise reduction thresholding, use this noise power threshold value, (being about to each single footpath power and uniting main footpath power compare) directly adjudicated in transmission to all sub-districts, promptly obtain uniting each the cell channel estimation coefficient behind the noise reduction of main footpath, obtain the multipath information after filter in main footpath simultaneously.
In above-mentioned steps 10323 and the step 10324, with the multipath information after filter in main footpath in the above-mentioned steps 10322, each the sub-district master footpath information that obtains with last iteration, merge according to the correspondence that directly distributes, promptly obtain complete each cell transmission footpath information (if first iteration, then each cell transmission footpath information is the multipath information of uniting the first round after the noise reduction process of main footpath); Simultaneously, with each cell channel estimation coefficient of uniting after the noise reduction process of main footpath, channel estimation coefficient behind the iteration noise power noise reduction last round of with it is carried out addition (if the channel estimation coefficient behind the then last round of iteration noise power of the first round iteration noise reduction is 0), each the cell channel estimation coefficient after promptly being restored.Afterwards, the multipath information after the recovery processing is carried out the frequency domain conversion.
The embodiment of the invention is carried out transfer function by the midamble sign indicating number that in frequency domain terminal is received and is estimated computing, guarantees precision of channel estimation; The Interference Cancellation process parallel processing of many cell datas signal simultaneously can make the up-to-date reconstruct interference of each cell data signal include counteracting in, has improved data signal quality; Employing can obtain accurate cell transmission footpath information based on the effective diameter filtration treatment of uniting main footpath metric-threshold; Present embodiment compared to existing technologies, the midamble code data signal that a plurality of sub-districts is received by the iterative channel estimation computing carries out parallel interference elimination processing, when reducing hardware cost, improved precision of channel estimation, can obtain accurate cell transmission footpath information.
As shown in Figure 4, yet another embodiment of the invention proposes a kind of channel estimation methods of eliminating based on the parallel frequency domain interference in many sub-districts, on the basis of the foregoing description, wherein, also comprises after step 10323:
To each the cell channel estimation coefficient after the recovery processing, the noise power threshold value of using step 10322 to obtain is directly adjudicated (each single footpath power and noise power compare) to the transmission of all sub-districts, obtain each the cell channel estimation coefficient behind the noise power noise reduction, multipath information after promptly each sub-district master directly being filtered is carried out the noise reduction process based on noise power, thereby obtain the multipath information after noise path is filtered, finish the channel estimating of this iteration.
As shown in Figure 5, in the present embodiment, the algorithm of channel estimating computing is specific as follows by equation expression:
Step 1: the corresponding data separating of midamble sign indicating number part in the received signal is come, represent with r;
Step 2: r is carried out the FFT conversion, obtain R;
Step 3: the i time iteration, R carries out the absolutely dry counteracting of disturbing,
Initial value wherein
Step 4: with R
(i)Be sent to the ISCP measurement module, obtain " noise " measured value of the i time iteration
Initial value wherein
Step 5: with the data R that obtains in the above-mentioned steps three
(i)Point is multiplied by 1/M
j, M wherein
jIt is the FFT conversion of the basic midamble sign indicating number of j sub-district correspondence;
Step 6: the data that obtain in the above-mentioned steps five are carried out the IFFT conversion, obtain the residue channel estimating of this sub-district
Step 7: all co-frequency cells that step 6 is obtained
The main footpath of uniting is selected, and obtains channel estimating
Step 8: will obtain
With
Addition obtains
Step 9: right
Measure " noise " power that obtains according to step 4
And the noise reduction thresholding carries out noise reduction process, obtains behind the noise reduction
Step 10: right
Carry out the FFT conversion, obtain
Step 11: with M
jWith
Multiply each other, obtain the reconstruction signal of the i time iteration
Step 12: will obtain
Superpose respectively according to different districts, obtain
Preparation enters the computing of next round iterative channel estimation, deducts from R during in order to the i+1 time iteration.
The midamble code data signal that the present invention receives a plurality of sub-districts by the iterative channel estimation computing carries out parallel interference and eliminates processing, when reducing hardware cost, has improved precision of channel estimation, can obtain accurate cell transmission footpath information.
Present embodiment carries out transfer function by the midamble sign indicating number that in frequency domain terminal is received and estimates computing, guarantees precision of channel estimation; The Interference Cancellation process parallel processing of many cell datas signal simultaneously can make the up-to-date reconstruct interference of each cell data signal include counteracting in, has improved data signal quality; Employing is filtered based on the effective diameter of uniting main footpath metric-threshold and based on twice noise reduction process that the noise path of noise power is filtered, can be obtained accurate cell transmission footpath information; Present embodiment compared to existing technologies, the midamble code data signal that a plurality of sub-districts is received by the iterative channel estimation computing carries out parallel interference elimination processing, when reducing hardware cost, improved precision of channel estimation, can obtain accurate cell transmission footpath information.
As shown in Figure 6, further embodiment of this invention proposes a kind of channel estimation methods of eliminating based on the parallel frequency domain interference in many sub-districts, on the basis of the foregoing description, also comprises before step 103:
In the present embodiment, the iterative channel estimation number of times can be pre-configured, such as can the predetermined configurations value being 2,3 or 4 etc.
Present embodiment carries out transfer function by the midamble sign indicating number that in frequency domain terminal is received and estimates computing, guarantees precision of channel estimation; The Interference Cancellation process parallel processing of many cell datas signal simultaneously can make the up-to-date reconstruct interference of each cell data signal include counteracting in, has improved data signal quality; Employing is filtered based on the effective diameter of uniting main footpath metric-threshold and based on twice noise reduction process that the noise path of noise power is filtered, can be obtained accurate cell transmission footpath information; In addition, the iterative channel estimation number of times is configurable, and particularly under the same environment of constant power cell transmission frequently, the performance of channel estimation results can restrain fast, has improved the processing speed of real time data.In a word, the present invention compared to existing technologies, the midamble code data signal that a plurality of sub-districts is received by the iterative channel estimation computing carries out parallel interference to be eliminated and handles, when reducing hardware cost, improve precision of channel estimation, can obtain accurate cell transmission footpath information.
As shown in Figure 7, one embodiment of the invention proposes a kind of channel estimating apparatus of eliminating based on the parallel frequency domain interference in many sub-districts, comprising:
Receive memory module 401, be used to receive and store the midamble sign indicating number time domain data signal of a plurality of sub-districts;
Time domain frequency domain modular converter 402, being used for midamble sign indicating number time domain data conversion of signals is the frequency domain data signal;
Interative computation processing module 403 is used for by the iterative channel estimation computing frequency domain data signal being carried out parallel interference and eliminates processing, obtains each cell channel estimation coefficient;
As shown in Figure 8, interative computation processing module 403 specifically comprises:
Judging unit 4033 is connected between channel estimating unit 4032 and the output module 404, is used to judge whether the iterative channel estimation number of times reaches the predetermined configurations value;
Reconfiguration unit 4044 is connected the output of judging unit 4033, is used for each cell channel estimation coefficient is reconstructed processing, and obtains the frequency domain data signal after each sub-district reconstruct;
Merge cells 4045 is connected between reconfiguration unit 4044 and the Interference Cancellation unit 4031, is used for the frequency domain data signal after the reconstruction processing is merged processing.
As shown in Figure 9, another embodiment of the present invention proposes a kind of channel estimating apparatus of eliminating based on the parallel frequency domain interference in many sub-districts, and on the basis of the foregoing description, wherein, interative computation processing module 403 also comprises:
Time domain converting unit 40321 is connected the output of channel estimating unit 4032, and being used for the frequency domain data conversion of signals after the described channel estimation process is the time domain data signal;
Unite main footpath noise reduction unit 40322, be connected time domain converting unit 40321 outputs, be used for described time domain data signal is united main footpath noise reduction process, obtain multipath information and each cell channel estimation coefficient after filter in main footpath;
Channel estimation coefficient recovery unit 40323 is connected and unites main footpath noise reduction unit 40322 outputs, is used for multipath information after the filtration of main footpath and channel estimation coefficient are recovered to handle;
Frequency domain converting unit 40324 is connected between described channel estimation coefficient recovery unit 40323 and the judging unit 4033, is used for the multipath information after the recovery processing is carried out the frequency domain conversion.
As shown in figure 10, yet another embodiment of the invention proposes a kind of channel estimating apparatus of eliminating based on the parallel frequency domain interference in many sub-districts, and on the basis of the foregoing description, wherein, interative computation processing module 403 also comprises:
Noise power noise reduction unit 40325, be connected between described channel estimation coefficient recovery unit 40323 and the frequency domain converting unit 40324, be used for the multipath information after the recovery processing is carried out the noise power noise reduction process, and obtain multipath information and each cell channel estimation coefficient after noise path is filtered.
In the present embodiment, by receiving memory module 401 receptions and storage midamble sign indicating number time domain data signal from a plurality of sub-districts of base station side, and be the frequency domain data signal with midamble sign indicating number time domain data conversion of signals by time domain frequency domain modular converter 402, promptly midamble sign indicating number time domain data signal is carried out fast Fourier transform FFT, make it convert the frequency domain data signal to, thereby finish the conversion of midamble code data signal from the time domain to the frequency domain; Afterwards, interative computation processing module 403 is carried out parallel interference by the iterative channel estimation computing to the frequency domain data signal and is eliminated processing, obtains each cell channel estimation coefficient.Its concrete processing procedure is:
Afterwards, carry out noise gate and calculate by uniting time domain data signal after 40322 pairs of channel estimation process of main footpath noise reduction unit, (data are real promptly the time domain data after the channel estimation process to be carried out each single footpath power calculation, the quadratic sum of imaginary part), compare its maximum, obtain uniting the noise power in main footpath, afterwards noise power-value is weighted, promptly obtain noise power threshold and promptly unite main footpath noise reduction thresholding, use this noise power threshold value, (being about to each single footpath power and uniting main footpath power compare) directly adjudicated in transmission to all sub-districts, promptly obtain uniting each the cell channel estimation coefficient behind the noise reduction of main footpath, obtain the multipath information after filter in main footpath simultaneously.
Then, recover to handle by multipath information and channel estimation coefficient after 40323 pairs of main footpath filtrations of channel coefficients recovery unit, be about to the multipath information after filter in main footpath, each the sub-district master footpath information that obtains with last iteration, distribute corresponding the merging according to the footpath, promptly obtain complete each cell transmission footpath information (if first iteration, then each cell transmission footpath information is the multipath information of uniting the first round after the noise reduction process of main footpath); Simultaneously, with each cell channel estimation coefficient of uniting after the noise reduction process of main footpath, channel estimation coefficient behind the iteration noise power noise reduction last round of with it is carried out addition (if the channel estimation coefficient behind the then last round of iteration noise power of the first round iteration noise reduction is 0), each the cell channel estimation coefficient after promptly being restored.
Each cell channel estimation coefficient after 40325 pairs of noise power noise reduction unit are recovered to handle, employing is united the noise power threshold value that main footpath noise reduction unit 40322 calculates (each single footpath power and noise power compare) is directly adjudicated in the transmission of all sub-districts, obtain each the cell channel estimation coefficient behind the noise power noise reduction, multipath information after promptly each sub-district master directly being filtered is carried out the noise reduction process based on noise power, thereby obtain the multipath information after noise path is filtered, multipath information after being filtered by 40324 pairs of noise path of frequency domain converting unit is again carried out the frequency domain conversion, finishes the channel estimating of this iteration.
At this moment, judge by judging unit 4033 whether the iterative channel estimation number of times reaches the predetermined configurations value,, then export each cell channel estimation coefficient by output module if reach the predetermined configurations value; If iterations does not reach the predetermined configurations value,, obtain the frequency domain data signal of each sub-district reconstruct by the FFT transformation results dot product of reconfiguration unit 4044 with the basic midamble code data of the channel estimation coefficient of the multipath information after the frequency domain conversion and its respective cell.Frequency domain data signal after 4045 pairs of reconstruction processing of merge cells merges processing, first round iterative channel estimation computing finishes, the frequency domain data signal that merge cells 4045 will merge after handling is sent to Interference Cancellation unit 4031, carries out the iterative channel estimation computing of next round.So repeat said process and carry out repeatedly interative computation, when iterations reaches the preset configuration value, promptly finished channel estimation process, the channel estimation results that obtains each sub-district is a channel estimation coefficient, and by the last channel estimation results of output module 404 outputs.
Need to prove that in the present embodiment, time domain converting unit 40321 in the interative computation processing module 403 and frequency domain converting unit 40324 can be the time domain frequency domain modular converter 402 in the present embodiment.In the present embodiment, each functional module and unit can be by independent control module Control work.
As shown in figure 11, yet another embodiment of the invention proposes a kind of channel estimating apparatus of eliminating based on the parallel frequency domain interference in many sub-districts, and on the basis of said apparatus embodiment, this device also comprises:
In the present embodiment, receive memory module 401, the intermediate treatment result who also is used for receiving and storing described interative computation processing module 403 each functional unit.
The embodiment of the invention is carried out transfer function by the midamble sign indicating number that in frequency domain terminal is received and is estimated computing, guarantees precision of channel estimation; The Interference Cancellation process parallel processing of many cell datas signal simultaneously can make the up-to-date reconstruct interference of each cell data signal include counteracting in, has improved data signal quality; Employing is filtered based on the effective diameter of uniting main footpath metric-threshold and based on twice noise reduction process that the noise path of noise power is filtered, can be obtained accurate cell transmission footpath information; In addition, the iterative channel estimation number of times is configurable, and particularly under the same environment of constant power cell transmission frequently, the performance of channel estimation results can restrain fast, has improved the processing speed of real time data.In a word, the present invention compared to existing technologies, the midamble code data signal that a plurality of sub-districts is received by the iterative channel estimation computing carries out parallel interference to be eliminated and handles, when reducing hardware cost, improve precision of channel estimation, can obtain accurate cell transmission footpath information.
The above only is the preferred embodiments of the present invention; be not so limit claim of the present invention; every equivalent structure or flow process conversion that utilizes specification of the present invention and accompanying drawing content to be done; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (11)
1. a channel estimation methods of eliminating based on the parallel frequency domain interference in many sub-districts is characterized in that, may further comprise the steps:
Receive and store the training sequence midamble sign indicating number time domain data signal of a plurality of sub-districts;
With midamble sign indicating number time domain data conversion of signals is the frequency domain data signal;
By the iterative channel estimation computing frequency domain data signal is carried out parallel interference and eliminate processing, obtain each cell channel estimation coefficient;
Export each cell channel estimation coefficient.
2. the channel estimation methods of eliminating based on the parallel frequency domain interference in many sub-districts according to claim 1 is characterized in that, describedly by the iterative channel estimation computing frequency domain data signal is carried out parallel interference and eliminates the step of handling and specifically comprise:
Described frequency domain data signal is carried out interference-cancellation process;
Frequency domain data signal after the interference-cancellation process is carried out channel estimation process, obtain each cell channel estimation coefficient;
Judge whether the iterative channel estimation number of times reaches the predetermined configurations value, if then export each cell channel estimation coefficient; Otherwise
Each cell channel estimation coefficient is reconstructed processing, and obtains the frequency domain data signal after each sub-district reconstruct;
Frequency domain data signal after the reconstruction processing is merged processing, and enter step described frequency domain data signal is carried out interference-cancellation process.
3. the channel estimation methods of eliminating based on the parallel frequency domain interference in many sub-districts according to claim 2, it is characterized in that, described frequency domain data signal after the interference-cancellation process is carried out channel estimation process, obtains also comprising after the step of each cell channel estimation coefficient:
With the frequency domain data conversion of signals after the described channel estimation process is the time domain data signal;
Described time domain data signal is united main footpath noise reduction process, obtain multipath information and each cell channel estimation coefficient after filter in main footpath;
Multipath information after the filtration of main footpath and each cell channel estimation coefficient are recovered to handle;
Multipath information after the recovery processing is carried out the frequency domain conversion.
4. the channel estimation methods of eliminating based on the parallel frequency domain interference in many sub-districts according to claim 3 is characterized in that, described after main footpath is filtered multipath information and each cell channel estimation coefficient step of recovering to handle after also comprise:
Multipath information after the recovery processing is carried out the noise power noise reduction process, and obtain multipath information and each cell channel estimation coefficient after noise path is filtered.
5. according to each described channel estimation methods of eliminating based on the parallel frequency domain interference in many sub-districts in the claim 1 to 4, it is characterized in that, describedly the frequency domain data signal is carried out also comprising before the step that parallel interference eliminate to handle by the iterative channel estimation computing:
The predetermined configurations value of iterative channel estimation number of times is set.
6. a channel estimating apparatus of eliminating based on the parallel frequency domain interference in many sub-districts is characterized in that, comprising:
Receive memory module, be used to receive and store the midamble sign indicating number time domain data signal of a plurality of sub-districts;
The time domain frequency domain modular converter, being used for midamble sign indicating number time domain data conversion of signals is the frequency domain data signal;
The interative computation processing module is used for by the iterative channel estimation computing frequency domain data signal being carried out parallel interference and eliminates processing, obtains each cell channel estimation coefficient;
Output module is used to export each cell channel estimation coefficient.
7. the channel estimating apparatus of eliminating based on the parallel frequency domain interference in many sub-districts according to claim 6 is characterized in that described interative computation processing module specifically comprises:
The Interference Cancellation unit is used for described frequency domain data signal is carried out interference-cancellation process;
Channel estimating unit is connected the output of described Interference Cancellation unit, is used for the frequency domain data signal after the interference-cancellation process is carried out channel estimation process, obtains each cell channel estimation coefficient;
Judging unit is connected between described channel estimating unit and the output module, is used to judge whether the iterative channel estimation number of times reaches the predetermined configurations value;
Reconfiguration unit is connected the output of described judging unit, is used for each cell channel estimation coefficient is reconstructed processing, and obtains the frequency domain data signal after each sub-district reconstruct;
Merge cells is connected between described reconfiguration unit and the Interference Cancellation unit, is used for the frequency domain data signal after the reconstruction processing is merged processing.
8. the channel estimating apparatus of eliminating based on the parallel frequency domain interference in many sub-districts according to claim 7 is characterized in that described interative computation processing module also comprises:
Time domain converting unit is connected described channel estimating unit output, and being used for the frequency domain data conversion of signals after the described channel estimation process is the time domain data signal;
Unite main footpath noise reduction unit, be connected described time domain converting unit output, be used for described time domain data signal is united main footpath noise reduction process, obtain multipath information and each cell channel estimation coefficient after filter in main footpath;
The channel estimation coefficient recovery unit is connected the described main footpath noise reduction unit output of uniting, and is used for multipath information after the filtration of main footpath and channel estimation coefficient are recovered to handle;
Frequency domain converting unit is connected between described channel estimation coefficient recovery unit and the judging unit, is used for the multipath information after the recovery processing is carried out the frequency domain conversion.
9. the channel estimating apparatus of eliminating based on the parallel frequency domain interference in many sub-districts according to claim 8 is characterized in that described interative computation processing module also comprises:
The noise power noise reduction unit, be connected between described channel estimation coefficient recovery unit and the frequency domain converting unit, be used for the multipath information after the recovery processing is carried out the noise power noise reduction process, and obtain multipath information and each cell channel estimation coefficient after noise path is filtered.
10. according to each described channel estimating apparatus of eliminating based on the parallel frequency domain interference in many sub-districts in the claim 6 to 9, it is characterized in that described device also comprises:
Module is set, is used to be provided with the predetermined configurations value of iterative channel estimation number of times.
11. the channel estimating apparatus of eliminating based on the parallel frequency domain interference in many sub-districts according to claim 10 is characterized in that described reception memory module, the intermediate treatment result who also is used for receiving and storing described each functional unit of interative computation processing module.
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