CN101938294B - Same-frequency multi-cell channel estimation method, device and system - Google Patents

Same-frequency multi-cell channel estimation method, device and system Download PDF

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CN101938294B
CN101938294B CN2009100544245A CN200910054424A CN101938294B CN 101938294 B CN101938294 B CN 101938294B CN 2009100544245 A CN2009100544245 A CN 2009100544245A CN 200910054424 A CN200910054424 A CN 200910054424A CN 101938294 B CN101938294 B CN 101938294B
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CN101938294A (en
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徐兵
王乃博
严伟
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Leadcore Technology Co Ltd
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Abstract

The invention discloses a same-frequency multi-cell channel estimation method, a same-frequency multi-cell channel estimation device and a same-frequency multi-cell channel estimation system. The same-frequency multi-cell channel estimation method comprises the following steps of: performing concurrent channel estimation on a cell and neighboring cells of which the power is higher than the set threshold value, and calculating a mutual interference vector of every two cells; performing concurrent interference recovery through the mutual interference vector and an interference tap iteratively selected from the channel estimation, and iteratively performing concurrent interference cancellation processing on the channel estimation until the set iterations is reached, and finishing the channel estimation. The same-frequency multi-cell channel estimation method, the same-frequency multi-cell channel estimation device and the same-frequency multi-cell channel estimation system can accurately perform channel estimation under the same-frequency multi-cell condition.

Description

A kind of common frequency multi-cell channel estimation method, Apparatus and system
Technical field
The present invention relates to communication technical field, relate in particular to a kind of common frequency multi-cell channel estimation method, Apparatus and system.
Background technology
Along with development of wireless communication devices and (3G, the 3rd Generation) rise in the world of 3G (Third Generation) Moblie technology, Radio Resource becomes more and more nervous as a kind of Limited resources.Time Division-Synchronous Code Division Multiple Access (TD-SCDMA for one of 3G mainstream standard; Time-DivisionSynchronization Code Division-Multiple-Access) system; Its Radio Resource that is assigned with also is very limited; In order to improve the availability of frequency spectrum of TD-SCDMA system, identical networking becomes a kind of effective solution.But identical networking has also brought with disturbing frequently when improving the availability of frequency spectrum.With disturbing the different districts inter-user interference that is meant that adjacent cell causes because of using identical carrier frequency to carry out transfer of data frequently.With interference frequently various aspects of performance such as power system capacity and communication quality are all descended to some extent.
The TD-SCDMA system adopts joint detection algorithm to accomplish the demodulation of user data.Use the channel impulse response that joint detection algorithm need estimate each user exactly.Usually, the TD-SCDMA system utilizes training sequence (be the Midamble sign indicating number, claim intermediate code again) to accomplish channel impulse response.During inter-frequency networking, joint detection algorithm can be used as the out-of-band noise processing with adjacent community user signal, only needs to consider that this community user gets final product.During identical networking, if will be used as noise processed by adjacent community user signal, and be not used as useful information, so this adverse effect is conspicuous.Along with the increase that co-frequency cell disturbs, the joint detection receiver performance of single sub-district constantly descends, and will directly influence network performance with the degree of disturbing frequently.Therefore, need to consider to adopt effective and efficient manner to reduce the influence that co-channel interference causes system.The Interference Cancellation scheduling algorithm of the joint-detection of many sub-districts and many sub-districts can be handled the signal of many sub-districts simultaneously, improves with the network performance under the frequency situation.But no matter using which kind of method, the channel of sub-district is estimated it all is very important, also usually is necessary.
At present, prior art has proposed some and when channel estimating, has introduced the method for Interference Cancellation, is patent documentations such as 03100670.1,200510029535.2,200610089204.2 like application number.Wherein application number is 03100670.1,200510029535.2 patent documentation, directly adopts the thinking of Interference Cancellation, and at every turn cancellation has estimated that the interference of sub-district goes to carry out the next one or channel estimating next time again from receive data.Its realization can be as shown in Figure 1, its basic thought be adopt channel estimating → interference recovery → interference eliminated → channel estimating → ... the iteration thought of → channel estimating is carried out interference eliminated and channel estimating.The shortcoming of this method is that amount of calculation is too big, repeatedly carries out channel estimating, and channel estimating often adopts fast Fourier transform (FFT at present; Fast Fourier Transform) with Fast Fourier Transform Inverse (IFFT; InverseFast Fourier Transfer) the Steiner method of estimation that combines though this method is fairly simple a kind of channel estimation methods, is carried out repeatedly; Add and repeatedly use FFT realization convolution to disturb recovery, computation complexity is quite big.Application number is the method that 200610089204.2 patent documentation has proposed to carry out at frequency domain Interference Cancellation, before two kinds of method amounts of calculation descend to some extent, but amount of calculation is still bigger.
In addition; Also there is otherwise separately problem in above the whole bag of tricks; Like application number is 03100670.1,200510029535.2 patent documentation, and when the common-frequency cell signal power difference was big, the channel estimating of initial lower-powered sub-district maybe be very inaccurate; Disturb recovery and counteracting may introduce new interference with it, influence performance.And application number is 200610089204.2 patent documentation; Though during beginning each cell signal strength is sorted; But this fashion is not carried out channel estimating; In fact be difficult to confirm the signal strength signal intensity of each sub-district, therefore ordering makes mistakes probably, also possibly estimate to introduce new interference under the inaccurate situation.
Summary of the invention
The embodiment of the invention provides a kind of common frequency multi-cell channel estimation method, Apparatus and system, can under the situation of common frequency multi-cell, accurately carry out channel estimating.
The embodiment of the invention provides following technical scheme:
A kind of common frequency multi-cell channel estimation method comprises:
The parallel channel estimation is carried out greater than the neighbor cell of setting threshold value in this sub-district and power, calculate the mutual interference vector of per two sub-districts;
Recover through the interference tap of in channel estimating, selecting of said mutual interference vector and iteration being carried out parallel interference, channel estimating is carried out Parallel Interference Cancellation handling of iteration until the iterations that reaches setting, accomplished channel estimating.
A kind of common frequency multi-cell channel estimating apparatus comprises:
Initialization module is used for the parallel channel estimation is carried out greater than the neighbor cell of setting threshold value in this sub-district and power, calculates the mutual interference vector of per two sub-districts;
The iterative processing module; Be used for recovering through parallel interference is carried out in the interference tap of selecting in channel estimating of said mutual interference vector and iteration; Channel estimating is carried out Parallel Interference Cancellation handling of iteration until the iterations that reaches setting, accomplished channel estimating.
A kind of common frequency multi-cell channel estimation system comprises aforesaid common frequency multi-cell channel estimating apparatus.
The common frequency multi-cell channel estimation method that the embodiment of the invention provides, Apparatus and system; Adopting the mutual interference vector directly to calculate disturbs; And from single cell channel estimated result, directly eliminate and disturb; Only need carry out one time channel estimating; Avoid carrying out repeatedly FFT and IFFT and calculate, effectively reduced amount of calculation; By selecting the strong neighbor cell of power, and only choose the bigger several taps of power, and tap improves the reliability of selected interference tap by variable thresholding setting when choosing at every turn, thereby reduced the probability of extra introducing interference; Adopt the method for part interference eliminated,, improve the partial interference cancellation coefficient gradually, also further make interference eliminated more reasonable along with the increase of iterations.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the existing techniques in realizing block diagram;
Fig. 2 is the common frequency multi-cell channel estimation method overview flow chart that the embodiment of the invention provides;
Fig. 3 is the common frequency multi-cell channel estimation method particular flow sheet that the embodiment of the invention provides;
Fig. 4 is the data structure sketch map of a time slot of TD-SCDMA;
Fig. 5 is the common frequency multi-cell channel estimating apparatus structural representation that the embodiment of the invention provides.
Embodiment
The embodiment of the invention provides a kind of common frequency multi-cell channel estimation method, Apparatus and system, can under the situation of common frequency multi-cell, accurately carry out channel estimating.For making the object of the invention, technical scheme and advantage clearer, the embodiment that develops simultaneously with reference to the accompanying drawings is to further explain of the present invention.
Common frequency multi-cell channel estimation method overview flow chart as shown in Figure 2, as to provide for the embodiment of the invention.Said method comprises:
Step 201, this sub-district and power are carried out parallel channel greater than the neighbor cell of setting threshold value estimate, calculate the mutual interference vector of per two sub-districts;
Step 202,, the interference tap of in channel estimating, selecting of said mutual interference vector and iteration (or circulation) recovers through being carried out parallel interference; Channel estimating carried out Parallel Interference Cancellation the handling of iteration (or circulation); Until the iteration that reaches setting (or circulation) number of times, accomplish channel estimating.
Common frequency multi-cell channel estimation method particular flow sheet as shown in Figure 3, as to provide for the embodiment of the invention.Said method specifically comprises:
Step 301, select the neighbor cell of power greater than threshold value;
Particularly, from the candidate cell of measurement result, select N 0(embodiment of the invention hypothesis N 0=2) the stronger neighbor cell of individual power.It is more accurate for subsequent channel is estimated; Be unlikely to interference because of estimating that inaccurate introducing is extra; The embodiment of the invention uses this sub-district received signal code power (RSCP, ReceivedSignal Code Power) measured value to set a threshold value, and is preferred; Can on the basis of this sub-district RSCP value, be multiplied by a coefficient, all sub-districts that is lower than this threshold value can not be selected in.The sign indicating number of supposing the selected basic Midamble sign indicating number in sub-district number is m 1, m 2, the sign indicating number of the basic Midamble sign indicating number in this sub-district number is designated as m 0
Step 302, time slot extracting data channel evaluation data from receiving;
Particularly, be used for the part of channel estimating, generally get Midamble part back 128chips data, be designated as e from a time slot extracting data that receives m, as shown in Figure 4, be the data structure sketch map of a time slot of TD-SCDMA.Wherein, GP representes protection at interval, and CP representes chip.
Step 303, this sub-district and the neighbor cell selected are carried out original channel estimating respectively;
Particularly, use the Steiner method of estimation, three selected sub-districts are estimated to obtain three sub-district original channels respectively estimate h0, h1, h2;
Method of estimation specifies as follows:
At first the basic Midamble sign indicating number to three sub-districts carries out the FFT conversion respectively, and the result is designated as vectorial G respectively 0, G 1, G 2
Then the data of extracting are carried out the FFT conversion
e ~ = FFT ( e m )
Estimate to obtain the original channel estimation of three sub-districts at last respectively
h 0 = IFFT ( e ~ m . / G 0 )
h 1 = IFFT ( e ~ m . / G 1 )
h 2 = IFFT ( e ~ m . / G 2 )
Wherein. the element of two vectors of/symbolic representation is divided by successively.
This moment h0, h1, h2 include the interference of other two sub-districts.
Convenient for subsequent treatment, can open up a memory space again, be used to write down h0, h1, h2 is designated as h ' 0 respectively, and h ' 1, and h ' 2, wherein h ' 0=h0, h ' 1=h1, h ' 2=h2.
Step 304, the neighbor cell mutual interference vector between any two that calculates said this sub-district and select;
Particularly, calculate three sub-districts mutual interference vector between any two, use R (i, j)Mutual interference vector between expression cell i and the sub-district j needs calculating and stores six groups of mutual interference vectors, is respectively R (0,1), R (0,2), R (1,0), R (1,2), R (2,0)And R (2,1)
Computational methods are specific as follows:
R (i，j)＝IFFT(G i./G j)
Step 305, from said channel estimating, select a prominent tap, in channel estimating, choose the interference tap of power more than or equal to said comparison threshold after treatment as comparison threshold;
Particularly, at first from h ' 0, h ' 1, selects a prominent tap among the h ' 2, remembers the l that this tap is the k sub-district 0Individual tap, its watt level do || h ' k (l 0) || 2, use || h ' k (l 0) || 2α chooses the interference tap of power more than or equal to this thresholding as thresholding (0＜α≤1) in channel estimating h ' k, be designated as h ' k (l successively 0), h ' k (l 1) ...
Wherein choosing of α can reduce along with the increase of iterations.Beginning is not because channel estimating also is very accurate, and α should not be provided with too little, otherwise extra interference is introduced in the tap meeting of falsely dropping.Along with the increase of iterations, the gained channel estimation reliability increases, and therefore can suitably reduce threshold value α.
Recovery is disturbed in step 306, the interference tap that utilizes said mutual interference vector sum to choose, and obtains interference components;
Particularly, utilize the mutual interference vector that calculates in the interference tap selected in the step 305 and the step 304 to disturb recovery, restoration methods is specific as follows:
I i = Σ m = 0,1 , . . . h ′ k ( l m ) R l m ( i , k ) ; i ≠ k
I wherein iThe interference components of tap to cell i disturbed in expression,
Figure G2009100544245D00062
Be vectorial R (i, k)Cyclic shift vector, promptly R l m ( i , k ) = R ( i , k ) ( ( j - l m + 128 ) Mod 128 ) .
Step 307, obtain the part interference components, from said channel estimating, deduct said part interference components respectively according to said interference components;
Particularly, at first the interference components that obtains in the step 306 is multiplied by a partial interference cancellation factor beta, promptly obtains part interference components β I i, 0＜β≤1, this coefficient increases along with the increase of iterations, and for example the n time iteration coefficient can be taken as
Figure G2009100544245D00064
N=1,2 ...; It does the time spent owing to also contain interference in the tap that begins to choose; Therefore certainly exist error with its interference that recovers, be multiplied by a part interference coefficient and can reduce error, and along with the increase of iterations; Channel estimation results is more and more reliable, and it is big that this coefficient also just can become gradually.
From the channel estimating of original channel estimation and backup, deduct the part interference components then respectively:
hi＝hi-β·I i，i≠k
h′i＝h′i-β·I i，i≠k
Judge at last whether number of iterations reaches maximum iteration time,, then accomplish channel estimating if reach, output h0, h1, h2, otherwise carry out step 308.
Step 308, the interference tap position that will choose carry out mark to be repeated to choose in the next iterative process avoiding;
Particularly, the tap position of choosing in the step 305 is designated as 0, i.e. h ' k (l 0), h ' k (l 1) ... all be changed to 0, turn back to then and repeat above-mentioned flow process in the step 305.
Need to prove; The foregoing description can be established one group of h ' 0 in addition when concrete the realization, h ' 1, and h ' 2; Because need extra memory space like this; Can select tap through other mode mark, for example each record has selected the cell id and the position of tap, so that the tap that next iteration is no longer selected to write down when disturbing tap to choose is handled.
Common frequency multi-cell channel estimating apparatus structural representation as shown in Figure 5, as to provide for the embodiment of the invention.This device comprises: initialization module and iterative processing module, and wherein, said initialization module is used for the parallel channel estimation is carried out greater than the neighbor cell of setting threshold value in this sub-district and power, calculates the mutual interference vector of per two sub-districts; Said iterative processing module; Be used for recovering through parallel interference is carried out in the interference tap of selecting in channel estimating of said mutual interference vector and iteration; Channel estimating is carried out Parallel Interference Cancellation handling of iteration until the iterations that reaches setting, accomplished channel estimating.Particularly, said initialization module comprises: unit 510, intermediate code extraction unit 520, channel estimating unit 530, mutual interference vector calculation unit 540 are chosen in the sub-district; Said iterative processing module comprises: disturb tap to choose unit 550, disturb recovery unit 560, partial interference cancellation unit 570, disturb tap indexing unit 580; Wherein:
Unit 510 is chosen in said sub-district, is used to select the neighbor cell of power greater than threshold value;
Particularly, from the candidate cell of measurement result, select N 0(embodiment of the invention hypothesis N 0=2) the stronger neighbor cell of individual power.It is more accurate for subsequent channel is estimated; Be unlikely to interference because of estimating that inaccurate introducing is extra; The embodiment of the invention uses this sub-district received signal code power (RSCP, ReceivedSignal Code Power) measured value to set a threshold value, and is preferred; Can on the basis of this sub-district RSCP value, be multiplied by a coefficient, all sub-districts that is lower than this threshold value can not be selected in.The sign indicating number of supposing the selected basic Midamble sign indicating number in sub-district number is m 1, m 2, the sign indicating number of the basic Midamble sign indicating number in this sub-district number is designated as m 0
Said intermediate code extraction unit 520 is used for from the time slot extracting data channel evaluation data that receives;
Particularly, be used for the part of channel estimating, generally get Midamble part back 128chips data, be designated as e from a time slot extracting data that receives m
Said channel estimating unit 530 is used for this sub-district and the neighbor cell selected are carried out original channel estimating respectively;
Particularly, use the Steiner method of estimation, three selected sub-districts are estimated to obtain three sub-district original channels respectively estimate h0, h1, h2.Convenient for subsequent treatment, can open up a memory space again, be used to write down h0, h1, h2 is designated as h ' 0 respectively, and h ' 1, and h ' 2, wherein h ' 0=h0, h ' 1=h1, h ' 2=h2.
Said mutual interference vector calculation unit 540, the neighbor cell mutual interference vector between any two that is used to calculate said this sub-district and selects;
Particularly, calculate three sub-districts mutual interference vector between any two, use R (i, j)Mutual interference vector between expression cell i and the sub-district j needs calculating and stores six groups of mutual interference vectors, is respectively R (0,1), R (0,2), R (1,0), R (1,2), R (2,0)And R (2,1)
Unit 550 is chosen in said interference tap, be used for from said channel estimating select a prominent tap through after the data processing as comparison threshold, in channel estimating, choose the interference tap of power more than or equal to said comparison threshold;
Particularly, at first from h ' 0, h ' 1, selects a prominent tap among the h ' 2, remembers the l that this tap is the k sub-district 0Individual tap, its watt level do || h ' k (l 0) || 2, with ‖ h ' k (l 0) || 2α chooses the interference tap of power more than or equal to this thresholding as thresholding (0＜α≤1) in channel estimating h ' k, be designated as h ' k (l successively 0), h ' k (l 1) ...
Wherein choosing of α can reduce along with the increase of iterations.Beginning is not because channel estimating also is very accurate, and α should not be provided with too little, otherwise extra interference is introduced in the tap meeting of falsely dropping.Along with the increase of iterations, the gained channel estimation reliability increases, and therefore can suitably reduce threshold value α.
Said interference recovery unit 560, recovery is disturbed in the interference tap that is used to utilize said mutual interference vector sum to choose, and obtains interference components;
Particularly, utilize interference tap of selecting and the mutual interference vector that calculates to disturb recovery, restoration methods is specific as follows:
I i = Σ m = 0,1 , . . . h ′ k ( l m ) R l m ( i , k ) ; i ≠ k
I wherein iThe interference components of tap to cell i disturbed in expression,
Figure G2009100544245D00082
Be vectorial R (i, k)Cyclic shift vector, promptly R l m ( i , k ) ( j ) = R ( i , k ) ( ( j - l m + 128 ) Mod 128 ) .
Said partial interference cancellation unit 570 is used for obtaining the part interference components according to interference components, from said channel estimating, deducts said part interference components respectively;
Particularly, at first the interference components that obtains is multiplied by a partial interference cancellation factor beta, promptly obtains part interference components β I i, 0＜β≤1, this coefficient increases along with the increase of iterations, and for example the n time iteration coefficient can be taken as
Figure G2009100544245D00084
N=1,2 ...; It does the time spent owing to also contain interference in the tap that begins to choose; Therefore certainly exist error with its interference that recovers, be multiplied by a part interference coefficient and can reduce error, and along with the increase of iterations; Channel estimation results is more and more reliable, and it is big that this coefficient also just can become gradually.
From the channel estimating of original channel estimation and backup, deduct the part interference components then respectively:
hi＝hi-β·I i，i≠k
h′i＝h′i-β·I i，i≠k
Judge at last whether number of iterations reaches maximum iteration time,, then accomplish channel estimating if reach; Output h0; H1, h2 repeats to choose in the next iterative process avoiding otherwise carry out mark through the interference tap position that said interference tap indexing unit 580 will be chosen.
Preferably, said sub-district is chosen unit 510 and is comprised: set subelement, be used to utilize the received signal code power measurement value of this sub-district to set threshold value; Select subelement, be used for received signal code power measurement result, select several neighbor cells that are not less than said threshold value according to candidate cell.
Said channel estimating unit 530 comprises: a FFT varitron unit is used for the intermediate code of each sub-district is carried out the FFT conversion respectively; The 2nd FFT varitron unit is used for the data of extracting that are used for channel estimating are carried out the FFT conversion; Several channel estimating subelements are used for respectively original channel estimating being carried out in each sub-district, obtain the original channel estimated value of each sub-district.
Need to prove; The foregoing description can be established one group of h ' 0 in addition when concrete the realization, h ' 1, and h ' 2; Because need extra memory space like this; Can select tap through other mode mark, for example each record has selected the cell id and the position of tap, so that the tap that next iteration is no longer selected to write down when disturbing tap to choose is handled.
The embodiment of the invention also further provides a kind of common frequency multi-cell channel estimation system, comprises the described common frequency multi-cell channel estimating apparatus of the foregoing description, specifies and sees the foregoing description for details, repeats no more here.Need to prove that said system can comprise mobile phone, data card, computer etc. for various 3G mobile communication terminals.
One of ordinary skill in the art will appreciate that and realize that all or part of step that the foregoing description method is carried is to instruct relevant hardware to accomplish through program; Described program can be stored in a kind of computer-readable recording medium; This program comprises one of step or its combination of method embodiment when carrying out.
In addition, each functional unit in each embodiment of the present invention can be integrated in the processing module, also can be that the independent physics in each unit exists, and also can be integrated in the module two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, also can adopt the form of software function module to realize.If said integrated module realizes with the form of software function module and during as independently production marketing or use, also can be stored in the computer read/write memory medium.
The above-mentioned storage medium of mentioning can be a read-only memory, disk or CD etc.
In sum; This paper provides a kind of common frequency multi-cell channel estimation method, Apparatus and system; Adopt the mutual interference vector directly to calculate and disturb, and from single cell channel estimated result, directly eliminate and disturb, only need carry out one time channel estimating; Avoid carrying out repeatedly FFT and IFFT and calculate, effectively reduced amount of calculation; Through selecting the strong neighbor cell of power, and only choose the bigger several taps of power, and tap improves the reliability of selected interference tap through variable threshold setting when choosing at every turn, thereby reduced the probability of extra introducing interference; Adopt the method for part interference eliminated,, improve the partial interference cancellation coefficient gradually, also further make interference eliminated more reasonable along with the increase of iterations.
More than common frequency multi-cell channel estimation method provided by the present invention, Apparatus and system are described in detail; Used specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand scheme of the present invention; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (10)

1. a common frequency multi-cell channel estimation method is characterized in that, comprising:
The parallel channel estimation is carried out greater than the neighbor cell of setting threshold value in this sub-district and power, calculate the mutual interference vector of per two sub-districts;
Through being carried out parallel interference, the interference tap of in said parallel channel is estimated, selecting of said mutual interference vector and iteration recovers; Iteration said parallel channel estimation carrying out Parallel Interference Cancellation is handled; Until the iterations that reaches setting, accomplish said parallel channel and estimate; Said interference tap is that it(?) will a prominent tap in said parallel channel is estimated pass through after the data processing as comparison threshold, and the power of choosing is more than or equal to the interference tap of said comparison threshold;
Saidly this sub-district and power carried out parallel channel greater than the neighbor cell of setting threshold value estimate that the mutual interference vector that calculates per two sub-districts comprises:
Select the neighbor cell of power greater than threshold value;
From the time slot extracting data channel evaluation data that receives;
This sub-district and the neighbor cell selected are carried out original channel estimating respectively;
The neighbor cell that calculates said this sub-district and select mutual interference vector between any two;
The said power of selecting comprises greater than the neighbor cell of threshold value: utilize the received signal code power measurement value of this sub-district to set threshold value;
According to the received signal code power measurement result of candidate cell, select several neighbor cells that are not less than said threshold value.
2. common frequency multi-cell channel estimation method according to claim 1 is characterized in that, said threshold value specifically is through the received signal code power measurement of this a sub-district last coefficient on duty is obtained.
3. common frequency multi-cell channel estimation method according to claim 1 is characterized in that, saidly this sub-district and the neighbor cell selected are carried out original channel estimating respectively comprises:
Intermediate code to each sub-district is carried out the FFT conversion respectively;
The data that are used for channel estimating to extracting are carried out the FFT conversion;
Estimate to obtain the original channel estimated value of each sub-district respectively.
4. common frequency multi-cell channel estimation method according to claim 1; It is characterized in that; Said through the parallel interference recovery is carried out in the interference tap of in said parallel channel is estimated, selecting of said mutual interference vector and iteration, an iterative process in the processing of said parallel channel estimation carrying out Parallel Interference Cancellation of iteration comprises:
From said parallel channel is estimated, select a prominent tap through after the data processing as comparison threshold, in said parallel channel is estimated, choose the interference tap of power more than or equal to said comparison threshold;
Recovery is disturbed in the interference tap that utilizes said mutual interference vector sum to choose, and obtains interference components;
Obtain the part interference components according to said interference components, from said parallel channel is estimated, deduct said part interference components respectively;
The interference tap position of choosing is carried out mark to be repeated to choose in the next iterative process avoiding.
5. common frequency multi-cell channel estimation method according to claim 4; It is characterized in that; Said part interference components specifically is to obtain through said interference components is multiplied by the partial interference cancellation coefficient, and the partial interference cancellation coefficient improves with the increase of iterations.
6. a common frequency multi-cell channel estimating apparatus is characterized in that, comprising:
Initialization module is used for the parallel channel estimation is carried out greater than the neighbor cell of setting threshold value in this sub-district and power, calculates the mutual interference vector of per two sub-districts;
The iterative processing module; Be used for through said mutual interference vector and iteration estimated that at said parallel channel the interference tap of selecting carries out parallel interference and recover; Iteration said parallel channel estimation carrying out Parallel Interference Cancellation is handled; Until the iterations that reaches setting, accomplish said parallel channel and estimate; Said interference tap is that it(?) will a prominent tap in said parallel channel is estimated pass through after the data processing as comparison threshold, and the power of choosing is more than or equal to the interference tap of said comparison threshold;
Said initialization module comprises:
The unit is chosen in the sub-district, is used to select the neighbor cell of power greater than threshold value;
The intermediate code extraction unit is used for from the time slot extracting data channel evaluation data that receives;
Channel estimating unit is used for this sub-district and the neighbor cell selected are carried out original channel estimating respectively;
The mutual interference vector calculation unit, the neighbor cell mutual interference vector between any two that is used to calculate said this sub-district and selects;
Said sub-district is chosen the unit and is comprised:
Set subelement, be used to utilize the received signal code power measurement value of this sub-district to set threshold value;
Select subelement, be used for received signal code power measurement result, select several neighbor cells that are not less than said threshold value according to candidate cell.
7. common frequency multi-cell channel estimating apparatus according to claim 6 is characterized in that, said channel estimating unit comprises:
The one FFT varitron unit is used for the intermediate code of each sub-district is carried out the FFT conversion respectively;
The 2nd FFT varitron unit is used for the data of extracting that are used for channel estimating are carried out the FFT conversion;
Several channel estimating subelements are used for respectively original channel estimating being carried out in each sub-district, obtain the original channel estimated value of each sub-district.
8. common frequency multi-cell channel estimating apparatus according to claim 6 is characterized in that, said iterative processing module comprises:
Disturb tap to choose the unit, be used for from said parallel channel estimate to select a prominent tap through after the data processing as comparison threshold, in said parallel channel is estimated, choose the interference tap of power more than or equal to said comparison threshold;
Disturb recovery unit, recovery is disturbed in the interference tap that is used to utilize said mutual interference vector sum to choose, and obtains interference components;
The partial interference cancellation unit is used for obtaining the part interference components according to interference components, from said parallel channel is estimated, deducts said part interference components respectively;
Disturb the tap indexing unit, be used for that the interference tap position of choosing is carried out mark and repeat to choose to avoid next iterative process.
9. a common frequency multi-cell channel estimation system is characterized in that, comprises like any described common frequency multi-cell channel estimating apparatus of claim 6 to 8.
10. common frequency multi-cell channel estimation system according to claim 9 is characterized in that, said system is a mobile communication terminal.
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