CN1905381B - Integrated testing method of low spread spectrum coefficient macrodiversity signal - Google Patents

Abstract

The invention discloses a combined detecting method of low-spread spectrum coefficient macro diversity signal, comprising the steps of: making multi-village channel estimation on local village and adjacent macro diversity villages and obtaining their channel response results; according to channel response result of each village, constructing intermediate matrix of each village; according to the intermediate matrixes, constructing their transmission matrixes; according to each transmission matrix, making macro diversity combined detection and obtaining detected data. And it can largely improve receiving performance of high speed same-frequency broadcast/multicast service.

Description

The associated detecting method of low spread spectrum coefficient macrodiversity signal

Technical field

The present invention relates to the mobile communication technology field, be specifically related to a kind of associated detecting method of low spread spectrum coefficient macrodiversity signal.

Background technology

Along with mobile communication technology and Internet (internet) technology rapid development, multimedia communication technology has obtained development rapidly, the some of them applied business, as video request program, television broadcasting, video conference, online education, interactive game etc., a plurality of users need receive identical data simultaneously.These mobile multi-media service data are compared with the general business data, and characteristics such as data volume is big, longer duration are arranged.In order to effectively utilize mobile network resource, global standardsization organize 3GPP to propose MBMS (broadcasting and multicast) business.MBMS refers to that a data source sends the point-to-multipoint service of data to a plurality of users, realizes that Internet resources share, and comprises that mobile core network and access network resource share, and especially interface-free resources is shared.CBS in MBMS and the prior mobile network (cell broadcaste service) is different, and CBS allows low bit rate data to share broadcast channel to all users' transmissions by the sub-district, is a kind of message based business.And the MBMS of 3GPP definition can not only realize the classes of messages multicast and the broadcasting of plain text low rate, and can realize the multimedia service multicast and the broadcasting of two-forty, for example information such as audio frequency, video.

Big according to broadcasting and multi-cast business data amount, receiving object is the uncertain characteristics of multiple spot and position, needs a plurality of base stations to send identical information, and needs bigger power to carry out theaomni-directional transmission, so that this information covers whole sub-district.For situation with frequency work, will produce bigger interference between the neighbor cell of support MBMS, when especially a plurality of base stations use identical physical resources such as carrier frequency, time slot and code channel to transmit broadcasting/packet service, co-channel interference between the neighbor cell of support MBMS will become the topmost interference of system, thereby reduced systematic function, limited the application of broadcasting/packet service.

In existing MBMS agreement,, advised that a kind of time diversity of TDD (time division duplex) system merges mode in order to reduce interference among adjacent cells.In this mode, in the moment by control different districts transmission identical information, make it at different time slot incoming terminals, like this, UE handles the information from different districts successively at different time slots, then it is merged, needing to avoid UE to receive the requirement of a plurality of links simultaneously with this.In order to realize that this time diversity merges, the microzonation of carrying MBMS need be divided into different set, each set is assigned with unique time slot or time slot combination, and these time slots or time slot combination do not have overlapping in time.When being integrated into distributed time slot emission information for one, other set are in unactivated state.UE receives data in different set, and merges by physical layer or RLC (Radio Link control) layer.This time diversifying method that proposes at the TDD system, the interference that reduces adjacent minizone is a cost to sacrifice channel capacity, this send mode has been wasted the resource of system greatly.

For this reason, the method that a kind of tdd systems transmits broadcasting/packet service has been proposed in another piece application documents of the applicant, a plurality of base stations use identical physical resources such as carrier frequency, time slot and code channel to transmit broadcasting/packet service, reduce resource waste with this.In the wireless communication system of employing code division multiple access, if identical physical resources such as carrier frequency, time slot and code channel are used in a plurality of base station, then support will produce bigger interference between the neighbor cell of MBMS, reduce thereby cause UE to receive detectability.

In the prior art, broadcast/group broadcast can only adopt big spreading gain to offset the interference of adjacent base station, thereby the transmission rate that makes broadcasting/packet service has been subjected to certain restriction. when the higher need of the rate requirement of broadcasting/packet service use little spreading gain, will produce bigger interference between the neighbor cell of support MBMS. utilize the associated detecting method of existing single sub-district, can reduce systematic function, limit the application of broadcasting/packet service.

Summary of the invention

The associated detecting method that the purpose of this invention is to provide a kind of low spread spectrum coefficient macrodiversity signal, to overcome conventional detection still can produce larger interference between homogeneous frequency adjacent area when broadcasting/packet service speed is higher shortcoming, reduce the interference strength between homogeneous frequency adjacent area, improve system's receptivity.

For this reason, the invention provides following technical scheme:

A kind of associated detecting method of low spread spectrum coefficient macrodiversity signal, described method comprises step:

A, this sub-district and grand diversity neighbor cell are carried out multi-cell channel estimate, obtain the channel response result of this sub-district and described neighbor cell;

B, according to the intermediary matrix that the channel response result of each sub-district constructs each sub-district, specifically comprise:

B1, from described channel response result the channel response h as a result of intercepting broadcast/group broadcast signal correspondence _i ^(k),

Wherein, i is a cell number, and k is the code channel numbering;

B2, calculate the aggregate channel response of each sub-district as follows:

$b_i^{(k,l)}={C_i}^{(k,q)}\·{S_i}^{(k,l\·Q+q)}\⊗{h_i}^{\left(k\right)},$

Wherein, b _i ^{(k, l)}Be the 1st aggregate channel response of k the spreading code in i sub-district, C _i ^{(k, q)}Be q chip of k the code channel in i sub-district, S _i ^{(k, lQ+q)}Be the chip of q scrambler of k the corresponding l section of code channel in i sub-district, q represents each chip of spreading code, q=1, and 2...Q, Q are spreading gain, 1=0,1 ..., P/Q-1, P are scrambler length;

B3, construct intermediary matrix B in the following manner _i:

The row parallel arranged is pressed in the 1st channel array response of K the spreading code in i sub-district, and forming size is that (Q+W-1, submatrix K) begin from (0,0) position, are placed on B _iThe upper left corner of matrix;

The row parallel arranged is pressed in the 2nd channel array response by K the spreading code in i sub-district, and forming size is that (Q+W-1, submatrix K) is at B _iThe Q that staggers downwards in matrix row, the capable placement of the K that staggers to the right;

The submatrix that all the other each channel array responses constitute is sequentially arranged in B in this way _iIn the matrix;

All the other positions fill out 0, and constituting size is (P+W-1, intermediary matrix B KP/Q) _i

Wherein, P is a scrambler length, and W is that channel estimation window is long, and K is the code channel number, and Q is a spreading gain;

C, construct the transmission matrix A of this sub-district and described neighbor cell as follows according to described intermediary matrix _i: size is (P+W-1, B KP/Q) _iMatrix is at A _iIn the matrix from the upper left corner (0,0) position successively along the diagonal repeated arrangement of matrix, each B _iStagger to the right KP/Q row of matrix, the P that staggers downwards is capable, arranges L altogether _Data/ P time, all the other positions fill out 0, constitute transmission matrix A _i, wherein, L _DataBe data block transmitted length;

D, carry out grand diversity joint-detection, obtain to detect data according to each transmission matrix that obtains.

Described steps A comprises:

A1, obtain the broadcast/group broadcast signal of this sub-district and grand diversity neighbor cell;

A2, the broadcast/group broadcast signal that obtains is carried out multi-cell channel estimate, obtain the channel response result of this sub-district and described neighbor cell.

The process that multi-cell channel described in the described steps A 2 is estimated is specially:

Carry out many yards collection channel estimating or each sub-district is carried out solid size collection channel estimating respectively according to the broadcast/group broadcast signal of this sub-district and the neighbor cell chosen.

B among the described step B2 _i ^{(k, l)}Calculating be specially:

Each spreading code that this sub-district is used successively with point-to-point the multiplying each other of each section of scrambler of this sub-district, generate P/Q combinational code; Again that these combinational codes are corresponding with this spreading code respectively channel response convolution obtains P/Q to should the combination of spreading codes channel response.

Alternatively, described step D comprises:

D1, each transmission matrix that will obtain merge;

D2, the transmission matrix after being combined carry out grand diversity joint-detection, obtain to detect data.

Described step D1 is specially:

By formula I=0,1,2 .... each transmission matrix that obtains is merged,

Wherein, β _iFor merging the factor, A _iTransmission matrix for each sub-district of obtaining.

Alternatively, described step D comprises:

The transmission matrix that D1 ', basis obtain carries out the community associated detection of list of this sub-district and described neighbor cell respectively;

The joint detection results of D2 ', each sub-district that will obtain merges, and obtains to detect data.

Described step D2 ' is specially:

By formula

I=0,1,2 ... the joint detection results to each sub-district of obtaining merges,

Wherein, β _iBe the merging factor, Joint detection results for each sub-district of obtaining.

By above technical scheme provided by the invention as can be seen, the present invention makes full use of the characteristics of broadcasting and multicast service, i.e. data source signal before the chnnel coding modulation of each cell base station transmission is identical.Include the co-channel interference signal of neighbor cell in joint-detection.In joint detection process, different at spreading code and scrambler length, by the structure intermediary matrix, again by the mode of intermediary matrix structure transmission matrix, solved the not construction problem of transmission matrix simultaneously of spreading code and scrambler length, for joint-detection provides the foundation.In joint detection process the multi-cell signals of including joint-detection in being carried out grand diversity merges, being about to contiguous each signal of base station of UE merges, interference is converted into useful signal, and the signal that has improved UE greatly receives and detects accuracy, and then has improved systematic function effectively.

Utilize the present invention, can reduce the interference of adjacent sub-district effectively, under the situation that guarantees resource utilization ratio, high-speed broadcast and multicast service are effectively used.

Description of drawings

Fig. 1 is a transmission matrix A organigram;

Fig. 2 is the realization flow figure of the inventive method;

Fig. 3 is the intermediary matrix structural representation of constructing in the inventive method;

Fig. 4 is the transmission matrix structural representation of constructing in the inventive method.

Embodiment

Core of the present invention is in CDMA (code division multiple access) system, on the basis of existing joint-detection, characteristics at broadcasting/packet service, send identical information by each base station, and the data source signal before the chnnel coding that each base station the sends modulation is identical, include the co-channel interference signal of contiguous each base station of UE in joint-detection, in joint detection process, different at low spread spectrum coefficient macrodiversity signal spreading code and scrambler length, the aggregate channel response structure intermediary matrix by each sub-district of obtaining at first, again by intermediary matrix structure transmission matrix, solved the problem that can't directly construct transmission matrix in this case by the aggregate channel response of each sub-district. the multi-cell signals of including joint-detection in is carried out grand diversity merge, being about to contiguous each signal of base station of UE merges, interference is converted into useful signal, thereby the raising system is to the detection performance of high-speed broadcast/multicast service.

In order to make those skilled in the art person understand the present invention program better, at first the associated detecting method of grand diversity is done simple the description below.

The signal model that the slot CDMA system receiver receives is:

e＝Ad+n (1)

Wherein, e is that receiver is received the signals sampling data, and d is for sending data, and n is the noise that receives, and matrix A is a transmission matrix.

Transmission matrix A is as shown in Figure 1:

Transmission matrix A is by the array response vector b of each code channel ^(k)(being distributed in the row in each piece on the diagonal in the matrix) constitutes:

Wherein,

A＝A _i，j i＝1...N·Q+W-1；j＝1...K·N

$A_{Q(n-1)+l,m+N(k-1)}=\left\{\begin{array}{cc}{b}_l^{\left(k\right)}& k=1...K;n=1...N;l=1...Q+W-1\\ 0& \mathrm{else}\end{array}\right.$

Wherein, k is the code channel numbering, supposes always to have K code channel.N is the number of data symbol in the data block, and Q is a spread spectrum coefficient.L _Data=NQ is for sending the length of data block, and W is that channel estimation window is long, L _Data+ W-1 is for receiving the length of data block e.

Vector b ^(k)Correspond to a user's aggregate channel response:

$b^{\left(k\right)}=C^{\left(k\right)}\⊗h^{\left(k\right)}$ k＝1，...，K (2)

Wherein, C ^(k)It is the spreading code that corresponding code channel is numbered user's code channel of k.

Be the convolution algorithm symbol, h ^(k)Be the channel response that corresponding code channel is numbered user's code channel of k, utilize midamble (intermediate code) or similar pilot tone to carry out channel estimating and obtain.

If system uses scrambler S, then (2) formula can be written as:

$b^{\left(k\right)}=(C^{\left(k\right)}\·S)\⊗h^{\left(k\right)}$ k＝1，...，K (3)

S is the scrambler that system uses in the formula.

Utilize above-mentioned information just can carry out joint-detection then.Joint detection algorithm has multiple, can be the method for Interference Cancellation, perhaps the method for linear block balance, the perhaps mixing of both methods.

To the method for linear block balance, the soft output value that the transmission data d after demodulation estimates is:

$\hat{d}={\left(T\right)}^{-1}{A}^{*T}{R}_n^{-1}e---\left(4\right)$

Wherein, matrix T is provided by following formula:

$T=\left\{\begin{array}{cc}I& \mathrm{MF}\\ A^{*T}{R}_n^{-1}A& \mathrm{ZF}-\mathrm{BLE}\\ A^{*T}{R}_n^{-1}A+R_d^{-1}& \mathrm{MMSE}-\mathrm{BLE}\end{array}\right.---\left(5\right)$

In the formula, * T is a conjugate transpose, R _d=E{dd ^{* T}, be the covariance matrix of data sequence d, for separate data sequence, R _d=I; R _n=E{nn ^{* T}, be the covariance matrix of noise sequence n.For separate and noise sequence (as white noise) R stably _n=σ ²I, I representation unit matrix.

At R _d=I and R _n=σ ²Under the condition of I, (4), (5) formula can be simplified shown as:

$\hat{d}={\left(T\right)}^{-1}{A}^{*T}e---\left(6\right)$

$T=\left\{\begin{array}{cc}I& \mathrm{MF}\\ A^{*T}A& \mathrm{ZF}-\mathrm{BLE}\\ A^{*T}A+{\mathrm{\σ}}^{2}I& \mathrm{MMSE}-\mathrm{BLE}\end{array}\right.---\left(7\right)$

Wherein, MF is matched filtering, and corresponding is exactly the method for single user's matched filtering; ZF-BLE is the method for ZF linear block balance, and corresponding is the linear solution of maximum likelihood; MMSE-BLE is the method for minimum Mean Square Error Linear block balance, and corresponding is the linear solution of least mean-square error.

Select a kind of the getting final product in above-mentioned three kinds of methods of finding the solution T, select second kind of ZF-BLE or the third MMSE-BLE method usually.

Utilize existing method, when the structure transmission matrix, require spread spectrum codes C ^(k)Identical with the length of scrambler S, otherwise can't realize that the step-by-step correspondence multiplies each other, thus can't directly generate aggregate channel response and transmission matrix.

When broadcasting/packet service speed is higher, need to use lower spread spectrum coefficient, at this moment spread spectrum codes C ^(k)Length less than the length of scrambler S.The present invention has promptly proposed a kind of effective solution at this situation.

The present invention is described in further detail below in conjunction with drawings and embodiments.

With reference to Fig. 2, Fig. 2 shows the realization flow of the inventive method, may further comprise the steps:

Step 201: the multi-cell channel estimation is carried out in this sub-district and grand diversity neighbor cell, obtain the channel response result of this sub-district and described neighbor cell.

At first need to determine to carry out the neighbor cell that grand diversity merges.According to the practical application needs, can choose one or more homogeneous frequency adjacent areas and carry out grand diversity and merge, then, obtain this sub-district and the broadcast/group broadcast signal of the neighbor cell chosen, and it is carried out multi-cell channel estimate, obtain the channel response result of this sub-district and described neighbor cell.Detailed process is as follows:

Common radio channel by measuring each homogeneous frequency adjacent area or obtain the configuration information of each homogeneous frequency adjacent area and the gap information of broadcast/group broadcast by the higher layer message of eating dishes without rice or wine.The configuration information of homogeneous frequency adjacent area comprises the cell ID of neighbor cell base station, the physical code channel that broadcast/group broadcast uses etc.According to the cell ID of homogeneous frequency adjacent area base station, receive the down-bound pilot frequency signal of each homogeneous frequency adjacent area base station then, this signal is measured determined time delay and the path loss of each base station to this UE.

According to time delay that measures and information on path loss, principle less according to time delay or that path loss is less is chosen and can be used to carry out the homogeneous frequency adjacent area that grand diversity merges; Also can take all factors into consideration time delay and path loss, choose the affiliated sub-district conduct in base station of the predetermined number of the equal minimum of time delay and path loss and carry out the neighbor cell that grand diversity merges.

According to actual reception ability and the computational accuracy requirement of UE, can choose one or more neighbor cells and carry out grand diversity merging.

The gap information of the broadcast/group broadcast that UE can obtain according to the gap information of the broadcast/group broadcast of system's fixed configurations or by the higher layer message of eating dishes without rice or wine obtains this sub-district and the broadcast/group broadcast signal of the neighbor cell chosen, broadcast/group broadcast signal to this sub-district that obtains and the neighbor cell of choosing carries out the multi-cell channel estimation, obtains the channel response result of this sub-district and neighbor cell.

The process that described multi-cell channel is estimated can be that the broadcast/group broadcast signal according to this sub-district and the neighbor cell chosen carries out many yards collection channel estimating, also can be that each sub-district is carried out solid size collection channel estimating respectively.

Step 202: the intermediary matrix of constructing each sub-district according to the channel response result of each sub-district.

(1) channel response of intercepting broadcast/group broadcast signal correspondence h as a result from the total channel response result in each sub-district _i ^(k), wherein, i is a cell number, k is the code channel numbering;

(2) constructing spreading code and the scrambler step-by-step combinational code v that multiplies each other and constitute _i ^{(k, l)}, the method for structure is as follows:

$v_i^{(k,l)}=C_i^{(k,q)}\·S_i^{(k,l\·Q+q)}---\left(9\right)$

In the formula, q=1,2 ..., Q, Q are spreading gain, l=0, and 1 ..., P/Q-1, P are scrambler length, k=1, and 2 ..., K represents k spreading code.

Following formula represents that scrambler segmentation and spreading code step-by-step multiply each other, and generates P/Q the different combinational code that length is Q.

(3) tectonic association channel response.The combinational code v that obtains by following formula _i ^{(k, l)}The calculation combination channel response:

$b_i^{(k,l)}=v_i^{(k,l)}\⊗h_i^{\left(k\right)}---\left(10\right)$

Wherein, b _i ^{(k, l)}Be the 1st aggregate channel response of k the spreading code in i sub-district, q represents each chip of spreading code, q=1, and 2...Q, Q are spreading gain, l=0,1 ..., P/Q-1, P are scrambler length.b _i ^{(k, l)}Calculating be specially: each spreading code that this sub-district is used successively with point-to-point the multiplying each other of each section of scrambler of this sub-district, generate P/Q combinational code; Again that these combinational codes are corresponding with this spreading code respectively channel response convolution obtains P/Q to should the combination of spreading codes channel response.

(4) construct intermediary matrix B in the following manner _i:

The row parallel arranged is pressed in the 1st channel array response of K the spreading code in i sub-district, and forming size is that (Q+W-1, submatrix K) begin from (0,0) position, are placed on B _iThe upper left corner of matrix;

The row parallel arranged is pressed in the 2nd channel array response by K the spreading code in i sub-district, and forming size is that (Q+W-1, submatrix K) is at B _iThe Q that staggers downwards in matrix row, the capable placement of the K that staggers to the right;

The submatrix that all the other each channel array responses constitute is sequentially arranged in B in this way _iIn the matrix;

All the other positions fill out 0, and constituting size is (P+W-1, intermediary matrix B KP/Q) _i

Wherein, P is a scrambler length, and W is that channel estimation window is long, and K is the code channel number, and Q is a spreading gain.

Intermediary matrix B _iStructure as shown in Figure 3:

Wherein, P is a scrambler length, and W is that channel estimation window is long, and K is the code channel number, and Q is a spreading gain.

The figure shows K spreading code separately with first section of scrambler point-to-point multiply each other again with corresponding channel impulse response convolution after constitute first data block, separately with second section of scrambler point-to-point multiply each other again with corresponding channel impulse response convolution after constitute second data block, by that analogy, be total to the P/Q piece.Because scrambler length is different with spreading code length, so the data difference of each submatrix among the figure, and each submatrix data is identical in the method for having now.

Because therefore combinational code and aggregate channel response that a spreading code correspondence a plurality of (P/Q) is different can not directly generate transmission matrix A according to existing method.Need earlier that these are different aggregate channel responses to be arranged in intermediary matrix B, constitute transmission matrix A by intermediary matrix B cycle arrangement again according to the form of last figure.

Step 203: the transmission matrix of constructing this sub-district and described neighbor cell according to intermediary matrix.

Construct transmission matrix A as follows _i:

Size is (P+W-1, B KP/Q) _iMatrix is at A _iIn the matrix from the upper left corner (0,0) position successively along the diagonal repeated arrangement of matrix, each B _iStagger to the right KP/Q row of matrix, the P that staggers downwards is capable, arranges N time altogether, and all the other positions fill out 0, formation transmission matrix A _iWherein, N=L _Data/ P.

Its structure is as shown in Figure 4:

Intermediary matrix B _iRespective sequence vertically differs P repeated arrangement formation A successively _iMatrix.

Among the figure, L _DataBe data block transmitted length.

Step 204: carry out grand diversity joint-detection according to each transmission matrix that obtains, obtain to detect data.

The grand diversity joint-detection of low-spred-spectrum coefficient provided by the invention is included the co-channel interference signal of contiguous each base station of UE in joint-detection, and the multi-cell signals of including joint-detection in is carried out grand diversity merge, being about to contiguous each signal of base station of UE merges, interference is converted into useful signal, to improve the receptivity of UE.Specifically can be after generating the transmission matrix of each sub-district, the transmission matrix of many sub-districts is merged, the transmission matrix after being combined then carries out joint-detection, obtains to detect data; Also can carry out the community associated detection of list of this sub-district and described neighbor cell respectively according to the transmission matrix that obtains earlier, the joint detection results of each sub-district that will obtain merges then, obtains to detect data.

1, as follows each transmission matrix that obtains is merged:

$A=\stackrel{i}{\mathrm{\Σ}}{\mathrm{\β}}_i{A}_i,$ i＝0，1，2，....

Wherein, β _iBe to merge the factor, can be for comprising 1 interior any greater than 0 numerical value (β _iValue can be according to certain for example equal gain combining of merging method, and high specific merging etc. obtains),

A _iTransmission matrix for each sub-district of obtaining.

Behind the transmission matrix A after obtaining merging, can carry out joint-detection to it.Detailed process is identical with the implementation procedure of prior art, does not repeat them here.

Realized the joint-detection of multiple sectors at same broadcast/group broadcast information frequently thus.

2, another macro diversity combining method is earlier each sub-district to be generated transmission matrix according to above-mentioned transmission matrix generation method, carries out the community associated detection of list of this sub-district and each homogeneous frequency adjacent area more respectively, obtains the detection signal of each sub-district

Then detection is obtained Merge, obtain to detect data.As shown in the formula:

$\hat{d}=\stackrel{i}{\mathrm{\Σ}}{\mathrm{\β}}_i{\hat{d}}_i$ i＝0，1，2，...

β in the formula _iBeing the merging factor of calculating according to certain criterion (for example equal gain combining or high specific merge method), can be any greater than 0 numerical value.

Send the method for high-speed broadcast/multicast service for time diversity, can carry out buffer memory to the data that receive earlier, the signal that then needs is carried out time diversity constitutes a set and adopts method of the present invention to handle simultaneously, method of the present invention can be generalized to the occasion of the multiple signals diversity that belongs to different time-gap in time like this; In addition, this method can not require that use identical physical resources such as carrier frequency, time slot and code channel in a plurality of base stations transmit high-speed broadcast/multicast service yet, and only require that a plurality of base stations use identical carrier frequency and time slot, like this, when relevant intermediary matrix of structure and transmission matrix, only needs need being carried out signal on the different code channels that diversity merges, to adjust to identical row just passable.

The inventive method also can expand to the group system of application group calling/group busy, when group system when a plurality of users send identical information, because it also has the characteristics that adjacent base station sends identical data, therefore under same situation frequently, also can use identical time interval resource to carry out group calling/group call service, perhaps adopt the mode of time diversity to carry out group calling/group call service by the configuration neighbor cell.UE adopts the associated detecting method of the grand diversity of above-mentioned low-spred-spectrum coefficient to detect to received signal, has improved the UE receptivity, has reduced co-channel interference, helps the application of high speed business.

As seen, utilize the inventive method, solved that spreading code length causes the problem that can't directly constitute transmission matrix in the slot CDMA system less than scrambler length, for the joint-detection of grand diversity provides basis effectively, make and when joint-detection, can utilize the characteristics of broadcasting/packet service, pass through macro diversity mode, many Cell Broadcast CB/multicast signals are merged reception, improved the receptivity of UE greatly high-speed broadcast/multicast service.

Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.

Claims (8)

1. the associated detecting method of a low spread spectrum coefficient macrodiversity signal is characterized in that, described method comprises step:

A, this sub-district and grand diversity neighbor cell are carried out multi-cell channel estimate, obtain the channel response result of this sub-district and described neighbor cell;

B, according to the intermediary matrix that the channel response result of each sub-district constructs each sub-district, specifically comprise:

B1, from described channel response result the channel response h as a result of intercepting broadcast/group broadcast signal correspondence _i ^(k), wherein, i is a cell number, k is the code channel numbering;

B2, calculate the aggregate channel response of each sub-district as follows:

$b_i^{(k,l)}={C_i}^{(k,q)}\·S_i^{(k,l\·Q+q)}\⊗{h_i}^{\left(k\right)},$

Wherein, b _i ^{(k, l)}Be the 1st aggregate channel response of k the code channel in i sub-district, C _i ^{(k, q)}Be q chip of k the code channel in i sub-district, S _i ^{(k, lQ+q)}By k the code channel in i sub-district the chip of the 1st section q scrambler of correspondence, q represents each chip of spreading code, q=1,2...Q, Q are spreading gain, 1=0,1 ..., P/Q-1, P are scrambler length;

B3, construct intermediary matrix B in the following manner _i:

The row parallel arranged is pressed in the 1st channel array response of K the spreading code in i sub-district, and forming size is that (Q+W-1, submatrix K) begin from (0,0) position, are placed on B _iThe upper left corner of matrix;

The row parallel arranged is pressed in the 2nd channel array response by K the spreading code in i sub-district, and forming size is that (Q+W-1, submatrix K) is at B _iThe Q that staggers downwards in matrix row, the capable placement of the K that staggers to the right;

The submatrix that all the other each channel array responses constitute is sequentially arranged in B in this way _iIn the matrix;

All the other positions fill out 0, and constituting size is (P+W-1, intermediary matrix B KP/Q) _i

Wherein, P is a scrambler length, and W is that channel estimation window is long, and K is the code channel number, and Q is a spreading gain;

C, construct the transmission matrix A of this sub-district and described neighbor cell as follows according to described intermediary matrix _i: size is (P+W-1, B KP/Q) _iMatrix is at A _iIn the matrix from the upper left corner (0,0) position successively along the diagonal repeated arrangement of matrix, each B _iStagger to the right KP/Q row of matrix, the P that staggers downwards is capable, arranges L altogether _Data/ P time, all the other positions fill out 0, constitute transmission matrix A _i, wherein, L _DataBe data block transmitted length; D, carry out grand diversity joint-detection, obtain to detect data according to each transmission matrix that obtains.

2. method according to claim 1 is characterized in that, described steps A comprises:

A1, obtain the broadcast/group broadcast signal of this sub-district and grand diversity neighbor cell;

A2, the broadcast/group broadcast signal that obtains is carried out multi-cell channel estimate, obtain the channel response result of this sub-district and described neighbor cell.

3. method according to claim 2 is characterized in that, the process that the multi-cell channel described in the described steps A 2 is estimated is specially:

Carry out many yards collection channel estimating or each sub-district is carried out solid size collection channel estimating respectively according to the broadcast/group broadcast signal of this sub-district and the neighbor cell chosen.

4. method according to claim 1 is characterized in that, b among the described step B2 _i ^{(k, l)}Calculating be specially:

Each spreading code that this sub-district is used successively with point-to-point the multiplying each other of each section of scrambler of this sub-district, generate P/Q combinational code; Again that these combinational codes are corresponding with this spreading code respectively channel response convolution obtains P/Q to should the combination of spreading codes channel response.

5. method according to claim 1 is characterized in that, described step D comprises:

D1, each transmission matrix that will obtain merge;

D2, the transmission matrix after being combined carry out grand diversity joint-detection, obtain to detect data.

6. method according to claim 5 is characterized in that, described step D1 is specially:

By formula I=0,1,2 .... each transmission matrix that obtains is merged,

Wherein, β _iFor merging the factor, A _iTransmission matrix for each sub-district of obtaining.

7. method according to claim 1 is characterized in that, described step D comprises:

The transmission matrix that D1 ', basis obtain carries out the community associated detection of list of this sub-district and described neighbor cell respectively;

The joint detection results of D2 ', each sub-district that will obtain merges, and obtains to detect data.

8. method according to claim 7 is characterized in that, described step D2 ' is specially:

By formula I=0,1,2 ... the joint detection results to each sub-district of obtaining merges,

Wherein, β _iBe the merging factor,

Joint detection results for each sub-district of obtaining.

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