CN102332965B - Data transmission method and system thereof based on transmission diversity mode - Google Patents

Abstract

The invention discloses a data transmission method and a system thereof based on a transmission diversity mode. The method comprises the following steps that: with regard to each transmitting antenna, a sender carries out repeated processing on data that needs to be sent by the transmitting antennas after precoding processing; with regard to each the transmitting antenna, the sender maps reference signals and data obtained by the repeated processing to a physical resource block of each the transmitting antenna according to a resource mapping scheme as well as sends the mapped data and the mapped reference signals; each receiving antenna of a receiver carries out resource extraction on respectively received data and the reference signals according to the preset resource mapping scheme; the receiving antennas work out space channel vectors of a service base station and an interference base station according to the reference signals that are obtained by the resource extraction, wherein the receiver belongs to the service base station and an interference base station, so that a space channel matrix is obtained; on the basis of the space channel matrix, an interference elimination matrix based on a transmission diversity mode is constructed; and data that are sent by the interference base station are eliminated according to the interference elimination matrix and a detection criterion, so that data sent by the service base station are obtained.

Description

Data transmission method based on transmission diversity mode and system

Technical field

The present invention relates to the communications field, relate in particular to a kind of data transmission method and system and the data sending device based on transmission diversity mode and data sink based on transmission diversity mode based on transmission diversity mode.

Background technology

At center of housing estate and cell edge, there is very large difference in the data transfer rate that existing cell mobile communication systems provides, this species diversity not only can affect the capacity of whole system, and larger difference appears in the service quality that can cause user to obtain in different positions, thereby affect user, experience.Therefore, a lot of wireless communication systems all will improve cell-edge performance as one of main demand parameter.

Interference between community (Inter-Cell Interference, referred to as ICI) is an intrinsic problem of cell mobile communication systems, and traditional solution is mainly the multiplexing mode of proportion.When carrying out channeling, multiplexing coefficient only has specific several value available, for example, can select 1,3,7 etc.Wherein, when multiplexing coefficient equals 1, identical frequency resource is all used in expression neighbor cell, now, very serious in the interference meeting of cell edge, if adopt larger multiplexing coefficient, for example, adopt 3 or 7, can effectively suppress ICI, but spectrum efficiency now will correspondingly be reduced to 1/3 or 1/7 of former spectrum efficiency.

Because wide-band mobile communication system is very high to the requirement of spectrum efficiency, so the multiplexing coefficient of hope frequency can approach 1 as far as possible, so, by the mode that adopts larger multiplexing coefficient to suppress to disturb, can not meet the demand of mobile communication system.

In order to guarantee that mobile communication system can meet the requirement of spectrum efficiency, propose at present a variety of inhibition or eliminated the mode of disturbing, for example, for Long Term Evolution (Long Term Evolution, referred to as LTE) system, following interference cancellation has mainly been proposed:

Mode (1): area interference randomization, which is specifically by interference signal randomization, although this randomized mode can not reduce the energy of interference signal, but can make the characteristic of interference signal be similar to white noise, thereby make terminal can rely on processing gain, interference signal be suppressed.LTE has adopted 504 cell scramblings (He504Ge community ID binding) to carry out interference randomization at present.Yet after adopting the mode of interference randomization, the gain that the compression that terminal needs is disturbed is very high, therefore, which can not effectively suppress for the strong jamming of cell edge;

Mode (2): area interference is eliminated, in which, the demodulation that the interference signal of main Shi Dui community is carried out to a certain degree is even decoded, and then utilizes the processing gain of receiver to eliminate interference signal component from receive signal.But, while adopting area interference cancellation in multiaerial system, due to this area interference cancellation can not with multiaerial system under multiple-input and multiple-output (Multiple Input Multiple Output, MIMO) technology is effectively compatible, therefore, need to increase extra antenna and just can reach the object of disturbing elimination, thereby can increase the complexity of communication equipment, and can obviously increase the complexity of receiving terminal processing procedure.

Mode (3): coordinating district interference/avoidance, the basic principle of which is that management arranges certain restriction to downlink resource, to coordinate the action of a plurality of communities, thereby avoids producing serious presence of intercell interference.By means of which, can improve to a certain extent the service quality of cell edge region, but, owing to adopting which can relate to dynamic resource, distribute, therefore need between different districts, coordinate, thereby introduce extra processing procedure, and can reduce the availability of frequency spectrum, run counter to the demand of wireless communication system.

Transmission diversity mode is the conventional transmission mode of wireless communication system, and the down link of LTE system is supported transmission diversity mode.The cardinal principle of transmission diversity is to utilize the weak dependence of space channel, and the selectivity in binding time/frequency for the transmission of signal provides more copy, thereby improves the reliability of signal transmission, improves the signal to noise ratio that receives signal.For the situation of 2 antenna transmission, its encoder matrix can be expressed as:

this matrix notation is transmission symbol s on moment t antenna 1 ₁, transmission symbol s on antenna 2 ₂; Transmission symbol on moment t+1 antenna 1

transmission symbol on antenna 2 this coded system is called Space-Time Block Coding; If this coding assignment is corresponding to subcarrier f and subcarrier f+1, this coded system is called again space-time/frequency block code (supporting space-time/frequency block code in LTE down link).

But, under the strongly disturbing environment of cell edge, even if adopted transmission diversity, also can cause reference signal (Reference Signals because of strongly disturbing impact, referred to as RS) and normally demodulation of data-signal, thus can not obtain the error rate of system requirements.

In addition, for example,, in other communication systems outside LTE system (, 3G communication system, 2G communication system, 2.5G communication system etc.), there is equally above-mentioned technical problem.At present, for the presence of intercell interference that how to suppress or eliminate cell edge, effective solution is not yet proposed.

Summary of the invention

For cannot effectively reducing the problem of the presence of intercell interference of cell edge in correlation technique, the invention provides a kind of data transmission method and system and the data sending device based on transmission diversity mode and data sink based on transmission diversity mode based on transmission diversity mode, can effectively reduce or eliminate the presence of intercell interference of cell edge.

According to an aspect of the present invention, provide a kind of data transmission method based on transmission diversity mode, for realizing many antennas transmissions of data under transmission diversity mode and the reception of at least one antenna.

The method comprises: for each transmitting antenna, transmit leg carries out reprocessing to the data that need to be sent by this transmitting antenna after precoding processing, and wherein, the mode of described precoding processing is determined based on transmission diversity mode; For described each transmitting antenna, described transmit leg is according to predetermined resource mapping scheme, the Physical Resource Block with reference to signal and the data-mapping that obtains after reprocessing to this transmitting antenna, and send described data and the reference signal after mapping; Each reception antenna of recipient carries out resource extraction according to described predetermined resource mapping scheme to the data that receive separately and reference signal; Described each reception antenna extracts according to resource the reference signal obtain and calculates serving BS under described recipient and interference base station to the space channel vector of this reception antenna of recipient, and to the space channel vector of recipient's all or part reception antenna, obtains spatial channel matrix according to described serving BS and interference base station; Described recipient is according to described spatial channel matrix, the interference cancellation matrix of structure based on transmission diversity mode, wherein, described interference cancellation matrix is that feature is carried out modeling and obtained according to transmission diversity mode, transmitting antenna, reception antenna, reprocessing, serving BS and interference base station; Described recipient eliminates according to described interference cancellation matrix and predetermined detection criteria the data that described interference base station sends, and obtains the data that described serving BS sends.

Wherein, according to described serving BS and interference base station, to the space channel vector of recipient's all or part reception antenna, obtaining spatial channel matrix comprises:

Described each reception antenna serving BS that extraction obtains to resource and the reference signal of interference base station are carried out separated and estimation, obtain all transmitting antennas to the physical channel of this reception antenna of recipient, according to reprocessing mode, the physical channel of estimating is arranged, formed the space channel vector that this reception antenna is corresponding;

Described recipient arranges space channel vector corresponding to the reception antenna of all or part according to the sequence number of reception antenna, forms described spatial channel matrix.

And, with reference to signal and the data-mapping that obtains after reprocessing to before the Physical Resource Block of this transmitting antenna, described method also comprises: the data according to predetermined interleaving scheme after to reprocessing interweave, and the data after interweaving are as data to be mapped; And, described each reception antenna carries out resource according to described predetermined resource mapping scheme to the data that receive separately and reference signal and extracts and comprise: described recipient carries out resource extraction to the data that receive, and the data that described resource extracted according to described predetermined interleaving scheme are carried out contrary interweaving; And before the physical channel of each reception antenna being arranged according to reprocessing mode described recipient, the method further comprises: according to described predetermined interleaving scheme, the physical channel of estimating is carried out to contrary interweaving.

Particularly, the described interference cancellation matrix of structure based on transmission diversity mode comprises: according to the number of the number of transmission diversity mode, described transmit leg transmitting antenna, described recipient's reception antenna, the data after precoding processing are carried out to the dimension that the number of times of reprocessing and the number of described interference base station are determined described interference cancellation matrix; And for each channel element in described spatial channel matrix, according to the sequence number of the sequence number of the sequence number of the reception antenna of this channel element, transmitting antenna, reprocessing and transmission diversity mode, determine the first dimension sequence number of this channel element in described interference cancellation matrix, and determine the second dimension sequence number of this channel element in described interference cancellation matrix according to the sequence number of the base station sequence number of this channel element, transmitting antenna and transmission diversity mode.

The method can also comprise: according to the number of described interference base station, pre-determine the times N of the data after described precoding processing being carried out to reprocessing, wherein, N >=B+1, the number that B is interference base station.

In addition, Physical Resource Block with reference to signal and the data-mapping that obtains after reprocessing to this transmitting antenna comprises: by the data-mapping obtaining through reprocessing to a plurality of Physical Resource Block, wherein, described a plurality of Physical Resource Block is positioned at the different frequency domain positions of same chronomere or is positioned at the same frequency position of different time unit or is positioned at the different frequency domain positions of different time unit.

And, before described transmit leg arrives the Physical Resource Block of this transmitting antenna by the data-mapping obtaining after reprocessing, described method also comprises: described transmit leg is reserved the resource location of the required mapping of reference signal of described serving BS and interference base station according to described predetermined resource mapping scheme, wherein, in mapping process, reserved resource location is only for mapping reference signal.

Alternatively, described transmission diversity mode comprises one of following: grouping when empty, empty frequency division group, transmit diversity, receive diversity.

Alternatively, described predetermined detection criterion comprises one of following: maximum likelihood, least mean-square error, least square method.

According to a further aspect in the invention, also provide a kind of data transmission system based on transmission diversity mode, for realizing many antennas transmissions of data under transmission diversity mode and the reception of at least one antenna.

This system comprises dispensing device and receiving system, wherein:

Described dispensing device comprises: replicated blocks, for for each transmitting antenna, the data that need to be sent by this transmitting antenna are carried out to reprocessing after precoding processing, and wherein, the mode of described precoding processing is determined based on transmission diversity mode; Mapping block, for for described each transmitting antenna, according to predetermined resource mapping scheme, the Physical Resource Block with reference to signal and the data-mapping that obtains after reprocessing to this transmitting antenna; A plurality of transmitting antennas, for sending described data and the reference signal after mapping;

Receiving system comprises: at least one reception antenna, wherein, each reception antenna is for carrying out resource extraction according to described predetermined resource mapping scheme to the data that receive separately and reference signal, extracts the reference signal obtaining calculate serving BS under described receiving system and interference base station to the space channel vector of this reception antenna of receiving system according to resource; Constructing module, for obtaining spatial channel matrix according to described serving BS and interference base station to the space channel vector of all or part reception antenna, and according to described spatial channel matrix, the interference cancellation matrix of structure based on transmission diversity mode, wherein, described interference cancellation matrix is that feature is carried out modeling and obtained according to transmission diversity mode, transmitting antenna, reception antenna, reprocessing, serving BS and interference base station; Cancellation module, eliminates according to described interference cancellation matrix and predetermined detection criteria the data that described interference base station sends, and obtains the data that described serving BS sends.

In accordance with a further aspect of the present invention, provide a kind of data sending device based on transmission diversity mode, for realizing many antennas of data under transmission diversity mode, sent.

This device comprises: replicated blocks, for for each transmitting antenna, the data that need to be sent by this transmitting antenna are carried out to reprocessing after precoding processing, and wherein, the mode of described precoding processing is determined based on transmission diversity mode; Mapping block, for for described each transmitting antenna, according to predetermined resource mapping scheme, the Physical Resource Block with reference to signal and the data-mapping that obtains after reprocessing to this transmitting antenna; A plurality of transmitting antennas, for sending described data and the reference signal after mapping.

According to a further aspect in the invention, also provide a kind of data sink based on transmission diversity mode, for realizing the reception of at least one antenna of data under transmission diversity mode.

This device comprises: at least one reception antenna, wherein, each reception antenna is for carrying out resource extraction according to predetermined resource mapping scheme to the data that receive separately and reference signal, extracts the reference signal obtaining calculate serving BS under described receiving system and interference base station to the space channel vector of this reception antenna of receiving system according to resource; Constructing module, for obtaining spatial channel matrix according to described serving BS and interference base station to the space channel vector of all or part reception antenna, and according to described spatial channel matrix, the interference cancellation matrix of structure based on transmission diversity mode, wherein, described interference cancellation matrix is that feature is carried out modeling and obtained according to transmission diversity mode, transmitting antenna, reception antenna, reprocessing, serving BS and interference base station; Cancellation module, eliminates according to described interference cancellation matrix and predetermined detection criteria the data that described interference base station sends, and obtains the data that described serving BS sends.

By means of technique scheme of the present invention, by the data to after precoding processing, carry out reprocessing and send and build the interference cancellation matrix based on transmission diversity mode recipient, can be in conjunction with the feature of transmission diversity, effectively eliminate the interference of other base stations to serving BS, improve the service quality of cell edge, improve user and experience.

Accompanying drawing explanation

Fig. 1 is according to the flow chart of the data transmission method based on transmission diversity mode of the embodiment of the present invention;

Fig. 2 is applied to the processing schematic diagram of transmit leg after LTE system according to the data transmission method based on transmission diversity mode of the embodiment of the present invention;

Fig. 3 is applied to the processing schematic diagram of recipient after LTE system according to the data transmission method based on transmission diversity mode of the embodiment of the present invention;

Fig. 4 is the schematic diagram that carries out data and reference signal mapping while being applied to LTE system according to the data transmission method based on transmission diversity mode of the embodiment of the present invention;

Fig. 5 is the contrast schematic diagram of Packet Error Ratio while adopting HARQ (HybridAutomatic Repeat reQuest) scheme according to the data transmission method based on transmission diversity mode of the embodiment of the present invention with tradition;

Fig. 6 is according to the block diagram of the data transmission system based on transmission diversity mode of the embodiment of the present invention.

Embodiment

For cannot effectively reducing the problem of the presence of intercell interference of cell edge in correlation technique, the present invention proposes, under transmission diversity mode, data are carried out to repetition, data to reference signal and after repeating are shone upon rear transmission, by recipient, according to spatial channel matrix, build the interference cancellation matrix based on transmission diversity mode, and utilize interference cancellation matrix and detection criteria to eliminate the interference of other base stations, obtain the data that serving BS sends, the method can, in conjunction with the feature of transmission diversity, reach the object that reduces or eliminate interference.

Below in conjunction with accompanying drawing, describe embodiments of the invention in detail.

According to embodiments of the invention, a kind of data transmission method based on transmission diversity mode is provided, the method is for realizing many antennas transmissions of data under transmission diversity mode and the reception of at least one antenna.

As shown in Figure 1, according to the data transmission method based on transmission diversity mode of the embodiment of the present invention, comprise:

Step S101, for each transmitting antenna, transmit leg carries out reprocessing to the data that need to be sent by this transmitting antenna after precoding processing, and wherein, the mode of precoding processing is determined based on transmission diversity mode;

Step S103, for each transmitting antenna, transmit leg is according to predetermined resource mapping scheme, the Physical Resource Block with reference to signal and the data-mapping that obtains after reprocessing to this transmitting antenna, and send data and the reference signal after mapping;

Step S105, each reception antenna of recipient carries out resource extraction according to predetermined resource mapping scheme to the data that receive separately and reference signal;

Step S107, each reception antenna extracts according to resource the reference signal obtain and calculates serving BS under recipient and interference base station to the space channel vector of this reception antenna of recipient, and to the space channel vector of recipient's all or part reception antenna, obtains spatial channel matrix according to serving BS and interference base station;

Step S109, recipient is according to spatial channel matrix, the interference cancellation matrix of structure based on transmission diversity mode, wherein, interference cancellation matrix is that feature is carried out modeling and obtained according to transmission diversity mode, transmitting antenna, reception antenna, reprocessing, serving BS and interference base station;

Step S111, recipient eliminates according to interference cancellation matrix and predetermined detection criteria the data that interference base station sends, and obtains the data that serving BS sends.

By above-mentioned processing, by the data to after precoding processing, carry out reprocessing and send and build the interference cancellation matrix based on transmission diversity mode recipient, can be in conjunction with the feature of transmission diversity, effectively eliminate the interference of other base stations to serving BS, improve the service quality of cell edge, improve user and experience.

Particularly, in said method, the processing that obtains spatial channel matrix to the space channel vector of recipient's all or part reception antenna according to serving BS and interference base station specifically can comprise:

Each reception antenna serving BS that extraction obtains to resource and the reference signal of interference base station are carried out separated and estimation, obtain all transmitting antennas to the physical channel of this reception antenna of recipient, according to reprocessing mode, the physical channel of estimating is arranged, formed the space channel vector that this reception antenna is corresponding; Recipient arranges space channel vector corresponding to the reception antenna of all or part according to the sequence number of reception antenna, Special composition channel matrix.

Alternatively, before the data that obtain after reprocessing and reference signal are mapped to the Physical Resource Block of this transmitting antenna, transmit leg can the data after to reprocessing interweave according to predetermined interleaving scheme, and the data after interweaving are as data to be mapped;

And, each reception antenna carries out resource according to predetermined resource mapping scheme to the data that receive separately and reference signal and extracts and comprise: recipient carries out resource extraction to the data that receive, and the data that resource extracted according to predetermined interleaving scheme are carried out contrary interweaving;

And, before the physical channel of each reception antenna being arranged according to reprocessing mode recipient, also need, according to predetermined interleaving scheme, the physical channel of estimating is carried out to contrary interweaving.

In the method, the space channel vector that above-mentioned spatial channel matrix sends to all reception antennas or part reception antenna by all transmitting antennas of transmit leg forms.For example, suppose that the quantity of transmitting antenna and the quantity of reception antenna are 4, each reception antenna in 4 reception antennas all can access the space channel vector from all transmitting antennas, the spatial channel matrix forming can comprise all space channel vectors that all reception antennas obtain, and also can comprise all space channel vectors that wherein part reception antenna obtains.

When the interference cancellation matrix of structure based on transmission diversity mode, can be according to the number of the number of transmission diversity mode, transmit leg transmitting antenna, recipient's reception antenna, the data after precoding processing are carried out to the dimension that the number of times of reprocessing and the number of interference base station are determined interference cancellation matrix; And for each channel element in spatial channel matrix, according to the sequence number of the sequence number of the sequence number of the reception antenna of this channel element, transmitting antenna, reprocessing and transmission diversity mode, (for example determine the first dimension sequence number of this channel element in interference cancellation matrix, can be the row sequence number of interference cancellation matrix), and determine the second dimension sequence number (for example, can be the row sequence number of interference cancellation matrix) of this channel element in interference cancellation matrix according to the sequence number of the base station sequence number of this channel element, transmitting antenna and transmission diversity mode.

In addition, alternatively, before the data that need to be sent by this transmitting antenna after precoding processing are carried out to reprocessing, can, according to the number of interference base station, pre-determine the times N of the data after precoding processing being carried out to reprocessing, wherein, N >=B+1, the number that B is interference base station.

With reference to signal and the data-mapping that obtains after reprocessing during to the Physical Resource Block of this transmitting antenna, the data-mapping obtaining through reprocessing can be arrived to a plurality of Physical Resource Block of this transmitting antenna, wherein, these a plurality of Physical Resource Block can be positioned at same chronomere different frequency domain positions, also can be positioned at different time unit same frequency position, can also be positioned at the different frequency domain positions of different time unit.Wherein, the chronomere mentioning here can applied system determine according to the present invention, for example, can be subframe.

Before transmit leg arrives the Physical Resource Block of this transmitting antenna by the data-mapping obtaining after reprocessing, transmit leg can be reserved the resource location of the required mapping of reference signal of serving BS and interference base station according to predetermined resource mapping scheme, wherein, in mapping process, reserved resource location is only for mapping reference signal.

It is one of following that above-mentioned transmission mode includes but not limited to: grouping when empty, empty frequency division group, transmit diversity, receive diversity.

In step S111, it is one of following that the predetermined detection criterion adopting includes but not limited to: maximum likelihood, least mean-square error, least square method.Those skilled in the art can select above-mentioned detection criteria or other more detection criteria according to actual application scenarios, concrete How to choose detection criteria and how to detect according to different detection criteria be known in those skilled in the art, will not enumerate herein.

LTE system will take below as example, describe the process that the present invention reduces or eliminate interference in LTE system in detail.Those skilled in the art are to be understood that, application process described below is only for setting forth the solution of the present invention, and be not used in restriction the present invention, for other wireless communication systems (for example, 3G communication system, 2G communication system, 2.5G communication system etc.), all can adopt the solution of the present invention, and reach the object that reduces or eliminate interference, thereby reduce the error rate of system, and improve the availability of frequency spectrum.

At present, than CDMA technology, the OFDM technology that LTE system adopts can solve the problem of disturbing in community better, but as cost, the ICI problem that LTE system is brought may be more serious than cdma system.If identical frequency spectrum resource is used in two neighbor cells in the portion region that is bonded to each other, can produce very strong ICI, in the situation that interference is stronger, even can cause system to work.

The such scheme of the present embodiment is being applied to, after LTE system, not only can guarantee the noiseproof feature of center of housing estate, and can effectively solving the presence of intercell interference of cell edge region.

As shown in Figure 2, in LTE system, as follows in the processing procedure of transmitting terminal according to the scheme of the present embodiment:

First, can encode to the data from information source, the processing such as scrambling, modulation; Carry out afterwards a layer mapping process, then carry out precoding processing, wherein, carry out the concrete mode of precoding processing here and can process according to space-time/frequency block code.

Afterwards, take 2 transmitting antennas as example, can suppose that the data after precoding are

i=0,1 ... M-1 is data sequence number, and k is base station sequence number, k=1: K, [S ₁s ₂] be antenna 1 at the signal of subcarrier f and subcarrier f+1 transmitting,

that antenna 2 is at the signal of subcarrier f and subcarrier f+1 transmitting.Will

data on each antenna repeat respectively after N time, the data that obtain can be expressed as after reprocessing:

$[S_i^k:S_{i+M-1}^k,S_{i+M}^k:S_{i+2M-1}^k,S_{i+2M}^k:S_{i+3M-1}^k,...S_{i+(N-1)*M}^k:S_{i+N*M-1}^k]=[(S_i^k:S_{i+M-1}^k),(S_i^k:S_{i+M-1}^k),(S_i^k:S_{i+M-1}^k),...,(S_i^k:S_{i+M-1}^k)],$

Data block length becomes NM; Suppose N=3, now, the data of repetition can be obtained after interleaver: wherein,

the interleaver for repeating data piece j that represents base station k, j=1: N.

By data

after being mapped on different physical resources, that is, convert logic data block to physical data block.Now, can pass through the transmitting data that represents antenna 1 and antenna 2, according to mapping ruler, (signal map is obtained to ofdm signal through IFFT modulation again after on the frequency domain resource piece of respective antenna 1 and antenna 2, complete the generation of ofdm signal), can be sent by radio frequency after adding Cyclic Prefix.Wherein, because the data of shining upon are the data after repeating, therefore, can think that the process of mapping is according to data

length carry out the process of redistribute resources money, need to will according to predetermined new resources allocative decision

signal map is on the time/frequency source block of corresponding frequency domain.And, when mapping, can reserve the mapping position of reference signal, thereby avoid mapping (enum) data on reserved position, further improve the quality of channel estimating, and then contribute to improve the effect of disturbing elimination.

As shown in Figure 3, for data and the reference signal that receiving end/sending end sends, will the processing procedure of receiving terminal be described below.

At receiving terminal, for each reception antenna, from prevention at radio-frequency port receives time domain data, first remove the Cyclic Prefix receiving in signal, carry out FFT conversion, according to the resource mapping scheme of transmitting terminal, carry out resource extraction afterwards, obtain corresponding signal resource,

represent what antenna l above received, in j repeating data piece, the data of sequence number i.

And except needs carry out channel estimating serving BS, recipient also needs adjacent base station (interference base station) thereby carries out the channel estimating that RS extraction obtains adjacent base station, afterwards, need the interference cancellation matrix of structure based on transmission diversity mode.

The in the situation that of 2 system of transmit antennas and transmit leg employing space-time/frequency block code transmitted signal, the reception signal of space-time/frequency block code can be expressed as conventionally:

wherein,

be illustrated in the empty signal frequently on upper two adjacent carriers that receive of antenna l.

In embodiments of the present invention, owing to adopting the scheme of the embodiment of the present invention when sending, so can be reconstructed into receiving signal model:

wherein,

the data of sequence number i in the repeating data piece j that expression antenna l receives.

represent channel estimating corresponding to data from base station k, transmitting antenna n, repeating data piece j, sequence number i that antenna l receives.

refer to receive on antenna l, from base station k, the signal of sequence number i.

gaussian noise corresponding to data of sequence number i in the repeating data piece j that expression antenna l receives.

In this model, corresponding interference cancellation matrix is:

${\widehat{\mathrm{\Ω}}}_i^{\mathrm{lK}}=\left[\begin{array}{cccccccccc}{H}_{11\_1}^{l1}& -H_{21\_1}^{l1}& H_{11\_1}^{l2}& H_{21\_1}^{l2}& 0& 0& H_{11\_1}^{l3}& H_{21\_1}^{l3}& 0& 0\\ {\left(H_{21\_1}^{l1}\right)}^{*}& {\left(H_{11\_1}^{l1}\right)}^{*}& 0& 0& {\left(H_{12\_1}^{l2}\right)}^{*}& {\left(H_{22\_1}^{l2}\right)}^{*}& 0& 0& {\left(H_{12\_1}^{l3}\right)}^{*}& {\left(H_{22\_1}^{l3}\right)}^{*}\\ H_{11\_2}^{l1}& -H_{21\_2}^{l1}& H_{11\_2}^{l2}& H_{21\_2}^{l2}& 0& 0& H_{11\_2}^{l3}& H_{21\_2}^{l3}& 0& 0\\ {\left(H_{21\_2}^{l1}\right)}^{*}& {\left(H_{11\_2}^{l1}\right)}^{*}& 0& 0& {\left(H_{12\_2}^{l2}\right)}^{*}& {\left(H_{22\_2}^{l2}\right)}^{*}& 0& 0& {\left(H_{12\_2}^{l3}\right)}^{*}& {\left(H_{22\_2}^{l3}\right)}^{*}\\ H_{11\_3}^{l1}& -H_{21\_3}^{l1}& H_{11\_3}^{l2}& H_{21\_3}^{l2}& 0& 0& H_{11\_3}^{l3}& H_{21\_3}^{l3}& 0& 0\\ {\left(H_{21\_3}^{l1}\right)}^{*}& {\left(H_{11\_3}^{l1}\right)}^{*}& 0& 0& {\left(H_{12\_3}^{l2}\right)}^{*}& {\left(H_{22\_3}^{l2}\right)}^{*}& 0& 0& {\left(H_{12\_3}^{l3}\right)}^{*}& {\left(H_{22\_3}^{l3}\right)}^{*}\end{array}\right];$

Wherein, the interference cancellation matrix based on transmission diversity mode at structure

time, can be according to the number of the number of transmission diversity mode, transmit leg transmitting antenna, recipient's reception antenna, the data after precoding processing are carried out to the dimension that the number of times of reprocessing and the number of interference base station are determined interference cancellation matrix; And for each channel element in spatial channel matrix, according to the sequence number of the sequence number of the sequence number of the reception antenna of this channel element, transmitting antenna, reprocessing and transmission diversity mode, determine the row sequence number of this channel element in interference cancellation matrix, and determine the row sequence number of this channel element in interference cancellation matrix according to the sequence number of the base station sequence number of this channel element, transmitting antenna and transmission diversity mode; And the line number of interference cancellation matrix can also further be determined according to the quantity of closing on interference base station.For receiving terminal, if N >=K can be met, interference cancellation matrix is full rank (Full Rank) matrix, and N is the number of repetition of data block, and K is the base station number that closes on interference.The full rank of interference cancellation matrix has guaranteed estimation that can be correct according to different criterions

It should be noted that given interference cancellation matrix here

be only a concrete example, the structure of above-mentioned interference cancellation matrix is changed, also utilizes the interference cancellation matrix after changing to carry out after subsequent treatment, can reach equally and reduce the object that cell edge disturbs.When structure interference cancellation matrix, for each channel element in spatial channel matrix, can also determine the row sequence number of this channel element in interference cancellation matrix according to the sequence number of the sequence number of the sequence number of the reception antenna of this channel element, transmitting antenna, reprocessing and transmission diversity mode, and determine the row sequence number of this channel element in interference cancellation matrix according to the sequence number of the base station sequence number of this channel element, transmitting antenna and transmission diversity mode; In addition, can also be under the prerequisite of calculation requirement that meets the transmission data of eliminating interference base station, local channel element in above-mentioned interference cancellation matrix is carried out to position change or place-exchange, and correspondingly, the expression that receives other parts in signal model also can be made corresponding change; In addition, for the situation of 4 antenna sending and receivings and other quantity antennas, can adjust accordingly equally and variation obtains interference cancellation matrix, concrete mapping mode will not enumerate herein.

Suppose, in this example, adopt minimum mean square error criterion to detect, be known noise variance matrix, now can obtain estimating

$\left[\begin{array}{c}{\hat{S}}_i^1\\ {\hat{S}}_i^2\\ .\\ .\\ .\\ {\hat{S}}_i^K\end{array}\right]=W_K\left[\begin{array}{c}{Y}_{1\_1}^l\\ {\left(Y_{2\_1}^l\right)}^{*}\\ Y_{1\_2}^l\\ {\left(Y_{2\_2}^l\right)}^{*}\\ Y_{1\_3}^l\\ {\left(Y_{2\_3}^l\right)}^{*}\end{array}\right],$

Wherein,

for a plurality of reception antennas, can expand the row of interference cancellation matrix:

${\widehat{\mathrm{\Ω}}}_i^K=\left[\begin{array}{c}{\widehat{\mathrm{\Ω}}}_i^{1K}\\ {\widehat{\mathrm{\Ω}}}_i^{2K}\\ \·\\ \·\\ \·\\ {\widehat{\mathrm{\Ω}}}_i^{\mathrm{LK}}\end{array}\right].$

According to above processing, can obtain the desired signal of eliminating after disturbing, if the communication for coordination of many communities, a plurality of cell signals also can obtain according to this scheme.

The reservation process of reference signal mapping position is described below in conjunction with accompanying drawing.

In order to improve the systematic function of the data transmission method of LTE downlink transmission diversity mode, terminal needs more accurately to estimate the channel response from a plurality of communities.In order to reach the reliability of the channel estimating of many communities, can reserve reference signal mapping position.Reference signal mapping in LTE descending time slot, take 3 base stations as example, the different antennae port reference signal that 3 base stations (each base station has two antennas) have been shown in Fig. 4 distributes, and the reference signal of base station 1, base station 2 and base station 3 different antennae ports, at frequency domain quadrature, does not interfere with each other mutually.But at cell edge, if the user in different districts has used identical frequency spectrum resource, just there is serious phase mutual interference in downlink data signal so, user can receive the signal at same frequency spectrum resource from different base station, at this moment signal interference ratio (that is, the power ratio of serving BS signal and interference base station signal, referred to as SIR) is normally lower than 0dB's, corresponding reference signal can be subject to the interference from the data-signal of different base station, can reduce the reliability of channel estimating.Therefore, serving BS and adjacent base station can exist the reference signal position of mutual interference base station to reserve to known these, guarantee that the reference signal that user can isolate different base station carries out channel estimating.In Fig. 4, identified the position of the reference signal of each each antenna of base station, these positions are mapping (enum) data signal no longer, thereby further improves the reliability of channel estimating.

Fig. 5 exists under strongly disturbing environment at cell edge, the contrast schematic diagram of Packet Error Ratio after the data transmission scheme of LTE down-link data channel (PDSCH) channel employing HARQ and the present embodiment.Abscissa in Fig. 5 is that signal to noise ratio (SNR) is the ratio of signal power and Gaussian noise power, and ordinate is Packet Error Ratio (BLER).Signal interference ratio represents the power ratio of this base station and adjacent two interference base stations.SIR=[0dB 0dB] represent that the power ratio of this base station and adjacent two interference base stations is all 0dB, the power of three base stations is identical.By the comparing result shown in Fig. 5, can find out, although HARQ scheme retransmits through 4 times, Packet Error Ratio, still more than 5%, cannot reach the index of proper communication; And adopt after the data transmission scheme of the present embodiment, according to the simulation curve of many area interference removing method, can reach the singal reporting code of Packet Error Ratio below 1%, can obviously improve the quality of communication.

Therefore, can find out, above-mentioned processing can not change under the prerequisite of LTE data-signal structure in conjunction with the feature of transmission diversity, can effectively eliminate the strong jamming from other adjacent base stations.LTE down link adopts after the solution of the present invention, even under the condition lower than 0dB, still can make communication meet normal index at cell edge signal interference ratio.

Similarly, when being applied to other wireless communication systems according to the scheme of the present embodiment, only need according to applied system difference and the above-mentioned part flow process of simple modifications can reach similar interference eradicating efficacy, concrete processing procedure will not enumerate herein.

According to embodiments of the invention, also provide a kind of data transmission system based on transmission diversity mode.This system can be used for realizing many antennas transmissions of data under transmission diversity mode and the reception of at least one antenna.

As shown in Figure 6, according to the data transmission system based on transmission diversity mode of the embodiment of the present invention, comprise dispensing device 61 and receiving system 62.

Particularly, dispensing device 61 comprises:

Replicated blocks 611, for for each transmitting antenna, carry out reprocessing to the data that need to be sent by this transmitting antenna after precoding processing, and wherein, the mode of precoding processing is determined based on transmission diversity mode;

Mapping block 612, for for each transmitting antenna, according to predetermined resource mapping scheme, the Physical Resource Block with reference to signal and the data-mapping that obtains after reprocessing to this transmitting antenna;

A plurality of transmitting antennas 613, for sending data and the reference signal after mapping;

Receiving system 62 comprises:

At least one reception antenna 621, wherein, each reception antenna is for carrying out resource extraction according to predetermined resource mapping scheme to the data that receive separately and reference signal, extracts the reference signal obtaining calculate serving BS under receiving system and interference base station to the space channel vector of this reception antenna according to resource;

Constructing module 622, for obtaining spatial channel matrix according to serving BS and interference base station to the space channel vector of all or part reception antenna, and according to spatial channel matrix, the interference cancellation matrix of structure based on transmission diversity mode, wherein, interference cancellation matrix is that feature is carried out modeling and obtained according to transmission diversity mode, transmitting antenna, reception antenna, reprocessing, serving BS and interference base station;

Cancellation module 623, eliminates according to interference cancellation matrix and predetermined detection criteria the data that interference base station sends, and obtains the data that serving BS sends.

By said system, by the data to after precoding processing, carry out reprocessing and send and build the interference cancellation matrix based on transmission diversity mode recipient, can be in conjunction with the feature of transmission diversity, effectively eliminate the interference of other base stations to serving BS, improve the service quality of cell edge, improve user and experience.

In addition, for the structure of interference cancellation matrix and based on interference cancellation matrix and detection criteria, disturb the process of eliminating being described before, no longer repeat here.

Similarly, thus said system can further introduce equally other processing modules and have data are interweaved and the several functions such as deinterleaving, reference signal mapping position be reserved; And this system can be applied to the various wireless communication system such as LTE system equally, and reach the similar interference eradicating efficacy of partly describing with embodiment of the method.

In sum, by means of technique scheme of the present invention, by the data to after precoding processing, carry out reprocessing and send and build the interference cancellation matrix based on transmission diversity mode recipient, can guarantee under the prerequisite of center of housing estate communication quality, with minimum system, be improved to cost, in conjunction with the characteristic of transmission diversity, effectively eliminate the interference of other base stations to serving BS, improve the service quality of cell edge, improve user and experience.

The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (10)

1. the data transmission method based on transmission diversity mode, for realizing many antennas transmissions of data under transmission diversity mode and the reception of at least one antenna, is characterized in that, described method comprises:

For each transmitting antenna, transmit leg carries out reprocessing to the data that need to be sent by this transmitting antenna after precoding processing, and wherein, the mode of described precoding processing is determined based on transmission diversity mode;

For described each transmitting antenna, described transmit leg is according to predetermined resource mapping scheme, the Physical Resource Block with reference to signal and the data-mapping that obtains after reprocessing to this transmitting antenna, and send described data and the reference signal after mapping;

Each reception antenna of recipient carries out resource extraction according to described predetermined resource mapping scheme to the data that receive separately and reference signal;

Described each reception antenna extracts according to resource the reference signal obtain and calculates serving BS under described recipient and interference base station to the space channel vector of this reception antenna of recipient, and to the space channel vector of recipient's all or part reception antenna, obtains spatial channel matrix according to described serving BS and interference base station;

Described recipient is according to described spatial channel matrix, the interference cancellation matrix of structure based on transmission diversity mode, wherein, described interference cancellation matrix is that feature is carried out modeling and obtained according to transmission diversity mode, transmitting antenna, reception antenna, reprocessing, serving BS and interference base station;

Described recipient eliminates according to described interference cancellation matrix and predetermined detection criteria the data that described interference base station sends, and obtains the data that described serving BS sends;

The described interference cancellation matrix of structure based on transmission diversity mode comprises:

According to the number of the number of transmission diversity mode, described transmit leg transmitting antenna, described recipient's reception antenna, the data after precoding processing are carried out to the dimension that the number of times of reprocessing and the number of described interference base station are determined described interference cancellation matrix; And

For each channel element in described spatial channel matrix, according to the sequence number of the sequence number of the sequence number of the reception antenna of this channel element, transmitting antenna, reprocessing and transmission diversity mode, determine the first dimension sequence number of this channel element in described interference cancellation matrix, and determine the second dimension sequence number of this channel element in described interference cancellation matrix according to the sequence number of the base station sequence number of this channel element, transmitting antenna and transmission diversity mode.

2. data transmission method according to claim 1, is characterized in that, obtains spatial channel matrix comprise according to described serving BS and interference base station to the space channel vector of recipient's all or part reception antenna:

Described each reception antenna serving BS that extraction obtains to resource and the reference signal of interference base station are carried out separated and estimation, obtain all transmitting antennas to the physical channel of this reception antenna of recipient, according to reprocessing mode, the physical channel of estimating is arranged, formed the space channel vector that this reception antenna is corresponding;

Described recipient arranges space channel vector corresponding to the reception antenna of all or part according to the sequence number of reception antenna, forms described spatial channel matrix.

3. data transmission method according to claim 2, is characterized in that, with reference to signal and the data-mapping that obtains after reprocessing to before the Physical Resource Block of this transmitting antenna, described method also comprises:

Data according to predetermined interleaving scheme after to reprocessing interweave, and the data after interweaving are as data to be mapped;

And, described each reception antenna carries out resource according to described predetermined resource mapping scheme to the data that receive separately and reference signal and extracts and comprise: described recipient carries out resource extraction to the data that receive, and the data that described resource extracted according to described predetermined interleaving scheme are carried out contrary interweaving;

And before the physical channel of each reception antenna being arranged according to reprocessing mode described recipient, the method further comprises: according to described predetermined interleaving scheme, the physical channel of estimating is carried out to contrary interweaving.

4. data transmission method according to claim 1, is characterized in that, also comprises:

According to the number of described interference base station, pre-determine the times N of the data after described precoding processing being carried out to reprocessing, wherein, N >=B+1, the number that B is interference base station.

5. data transmission method according to claim 1, is characterized in that, the Physical Resource Block with reference to signal and the data-mapping that obtains after reprocessing to this transmitting antenna comprises:

The data-mapping obtaining through reprocessing is arrived to a plurality of Physical Resource Block, wherein, described a plurality of Physical Resource Block is positioned at the different frequency domain positions of same chronomere or is positioned at the same frequency position of different time unit or is positioned at the different frequency domain positions of different time unit.

6. data transmission method according to claim 1, is characterized in that, before described transmit leg arrives the Physical Resource Block of this transmitting antenna by the data-mapping obtaining after reprocessing, described method also comprises:

Described transmit leg is reserved the resource location of the required mapping of reference signal of described serving BS and interference base station according to described predetermined resource mapping scheme, and wherein, in mapping process, reserved resource location is only for mapping reference signal.

7. according to the data transmission method described in any one in claim 1 to 6, it is characterized in that, it is one of following that described transmission diversity mode comprises: grouping when empty, empty frequency division group, transmit diversity, receive diversity.

8. according to the data transmission method described in any one in claim 1 to 6, it is characterized in that, it is one of following that described predetermined detection criterion comprises: maximum likelihood, least mean-square error, least square method.

9. the data transmission system based on transmission diversity mode, for realizing many antennas transmissions of data under transmission diversity mode and the reception of at least one antenna, is characterized in that, described system comprises dispensing device and receiving system, wherein,

Described dispensing device comprises:

Replicated blocks, for for each transmitting antenna, carry out reprocessing to the data that need to be sent by this transmitting antenna after precoding processing, and wherein, the mode of described precoding processing is determined based on transmission diversity mode;

Mapping block, for for described each transmitting antenna, according to predetermined resource mapping scheme, the Physical Resource Block with reference to signal and the data-mapping that obtains after reprocessing to this transmitting antenna;

A plurality of transmitting antennas, for sending described data and the reference signal after mapping;

Receiving system comprises:

At least one reception antenna, wherein, each reception antenna is for carrying out resource extraction according to described predetermined resource mapping scheme to the data that receive separately and reference signal, extracts the reference signal obtaining calculate serving BS under described receiving system and interference base station to the space channel vector of this reception antenna according to resource;

Constructing module, for obtaining spatial channel matrix according to described serving BS and interference base station to the space channel vector of all or part reception antenna, and according to described spatial channel matrix, the interference cancellation matrix of structure based on transmission diversity mode, wherein, described interference cancellation matrix is that feature is carried out modeling and obtained according to transmission diversity mode, transmitting antenna, reception antenna, reprocessing, serving BS and interference base station;

The described interference cancellation matrix of structure based on transmission diversity mode comprises:

According to the number of the number of transmission diversity mode, described transmit leg transmitting antenna, described recipient's reception antenna, the data after precoding processing are carried out to the dimension that the number of times of reprocessing and the number of described interference base station are determined described interference cancellation matrix; And

For each channel element in described spatial channel matrix, according to the sequence number of the sequence number of the sequence number of the reception antenna of this channel element, transmitting antenna, reprocessing and transmission diversity mode, determine the first dimension sequence number of this channel element in described interference cancellation matrix, and determine the second dimension sequence number of this channel element in described interference cancellation matrix according to the sequence number of the base station sequence number of this channel element, transmitting antenna and transmission diversity mode;

Cancellation module, eliminates according to described interference cancellation matrix and predetermined detection criteria the data that described interference base station sends, and obtains the data that described serving BS sends.

10. the data sink based on transmission diversity mode, for realizing the reception of at least one antenna of data under transmission diversity mode, is characterized in that, described device comprises:

At least one reception antenna, wherein, each reception antenna is for carrying out resource extraction according to predetermined resource mapping scheme to the data that receive separately and reference signal, extracts the reference signal obtaining calculate serving BS under described receiving system and interference base station to the space channel vector of this reception antenna according to resource;

Constructing module, for obtaining spatial channel matrix according to described serving BS and interference base station to the space channel vector of all or part reception antenna, and according to described spatial channel matrix, the interference cancellation matrix of structure based on transmission diversity mode, wherein, described interference cancellation matrix is that feature is carried out modeling and obtained according to transmission diversity mode, transmitting antenna, reception antenna, reprocessing, serving BS and interference base station;

The described interference cancellation matrix of structure based on transmission diversity mode comprises:

According to the number of the number of transmission diversity mode, described transmit leg transmitting antenna, described recipient's reception antenna, the data after precoding processing are carried out to the dimension that the number of times of reprocessing and the number of described interference base station are determined described interference cancellation matrix; And

For each channel element in described spatial channel matrix, according to the sequence number of the sequence number of the sequence number of the reception antenna of this channel element, transmitting antenna, reprocessing and transmission diversity mode, determine the first dimension sequence number of this channel element in described interference cancellation matrix, and determine the second dimension sequence number of this channel element in described interference cancellation matrix according to the sequence number of the base station sequence number of this channel element, transmitting antenna and transmission diversity mode;

Cancellation module, eliminates according to described interference cancellation matrix and predetermined detection criteria the data that described interference base station sends, and obtains the data that described serving BS sends.

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