CN102447658B - Method and device for suppressing and merging interference - Google Patents

Abstract

The invention discloses a method and a device for suppressing and merging interference, wherein the method comprises the steps that: pilot frequency subcarriers on all the resources blocks in the signal which is received by all the antennas are separated into pilot frequency groups; cross-correlation calculation is carried out on the pilot frequency groups which are formed by the pilot frequency subcarriers on the same positions of the resource blocks of different antennas, so the components of all the elements of an interference and noise correlation matrix are obtained; all the elements are obtained according to the components of all the elements; and the interference and noise correlation matrix is used for suppressing and merging the interference of the data subcarriers on all the antennas. According to the invention, the estimation precision of the interference and noise correlation matrix is improved.

Description

Disturb the method and the device that suppress merging

Technical field

The present invention relates to the communications field, in particular to a kind of method and device of suppressing merging of disturbing.

Background technology

OFDM (Orthogonal Frequency Division Multiplexing, referred to as OFDM) technology is a kind of multi-carrier digital modulation technique, is also a kind of channeling technology simultaneously.Than other modulation techniques and multiplex technique, OFDM technology has efficient spectrum utilization efficiency and good anti-multipath interference performance, therefore, be widely used in the audio frequency of broadcast type, video field and military, in commercial signal communication system, its main application comprises: high bitrate digital subscriber line system (High-speed Digital Subscriber Line, referred to as HDSL), asymmetrical Digital Subscriber Loop (Asymmetric Digital Subscriber Line, referred to as ADSL), (the European Telecommunications Standards Institute of ETSI, referred to as ETSI) digital audio broadcasting (the Digital Audio Broadcasting of standard, referred to as DAB), digital video broadcasting (Digital Video Broadcasting, referred to as DVB), high definition TV (High Definition Television, referred to as HDTV), wireless MAN (Wireless Metropolitan Area Network, referred to as WMAN) and WLAN (wireless local area network) (Wireless Local Area Network, referred to as WLAN) etc.Particularly, in wireless MAN (WMAN) and WLAN (wireless local area network) (WLAN) field, 802.16 series and 802.11 series standards using OFDM technology as Main physical layer technology have obtained extensive application.

Multiple-input and multiple-output (Multiple-Input Multiple-Output, referred to as MIMO) technology refers at the transmitting terminal of wireless communication system and receiving terminal and uses respectively multiple transmitting antennas and reception antenna.MIMO technology is the important breakthrough of wireless mobile communications field intelligent antenna technology, can in the situation that not increasing bandwidth, improve exponentially capacity and the availability of frequency spectrum of communication system, and can improve the reliability of system, reduces the error rate.MIMO technology has become one of key technology of wireless communication field, aspect WiMAX mobile communication system, third generation partner program (3rd Generation Partnership Project, referred to as 3GPP) in standard, added the relevant content of MIMO technology, in the system of B3G and 4G also by using MIMO technique; In wireless broadband access system, 802.16e, the 802.11n working out and the standards such as 802.20 have also adopted MIMO technology; In other Research of wireless communication systems, the systems such as for example ultra broadband (Ultra Wide Band, referred to as UWB) system and system for cognitive radio (Cognitive Radio, referred to as CR) are all being considered using MIMO technique.According to transmitting-receiving two-end antenna amount, with respect to common single-input single-output (Single-Input Single-Output, referred to as SISO) system, adopt the system of MIMO technology can also comprise the many output of single input (Single-Input Multi-Output, referred to as SIMO) and many single outputs of input (Multi-Input Single-Output, referred to as MISO).

OFDM technology and MIMO technology have good performance separately, can both improve significantly the performance of wireless communication system, so people expect the two to combine naturally, so not only can make up the shortcoming that the two exists separately, also make both sides' advantage better be brought into play simultaneously, develop more efficiently frequency spectrum resource and space resources, further improved spectrum utilance and the reliability of system.Therefore,, in next generation wireless communication technology, various standards and agreement are all using OFDM+MIMO as physical layer base band signal process scheme.

Adopt the general wider bandwidth of wireless communication system more in the past that adopts of wireless communication system of OFDM technology, therefore, tend to adopt identical networking mode to carry out the network planning and construction, now inevitably there is co-channel interference (being generally also referred to as common-channel interference, adjacent area interference), particularly in up (oppositely) direction.In order to reduce the impact of co-channel interference, improve power system capacity, ensure system reliability, people have been developed multiple technologies in various aspects such as the network planning, the network optimization, scheduling of resource, air protocol.But be limited to limitedly frequency spectrum resource, system equipment ability and technical bottleneck, co-channel interference still can exist, this will inevitably interfere with normal baseband signal and receive and process, and finally also need to carry out anti-co-channel interference processing to baseband signal in physical layer.For the multiaerial system that adopts MIMO technology, in the time that it adopts space diversity reception to communicate, need to do to merge to the reception signal on each antenna and process.People have been developed interference and have been suppressed to merge (Interference Rejection Combining, referred to as IRC) technology is applied to this merging process, to effectively suppressing co-channel interference, improve the Signal Interference and Noise Ratio (Signal-Interference-and-Noise-Ratio, referred to as SINR) of amalgamation result signal.

IRC technology is the optimum linearity merge algorithm under maximum signal noise ratio principle, and its weighting weight vector is derived by maximum signal noise ratio principle, asks for process need and utilize the correlation matrix of interference plus noise between each antenna.But, in communication system, together with useful signal is aliasing in interference plus noise, for ofdm system, useful signal and interference plus noise after fast Fourier transform conversion, are aliasing on each subcarrier jointly, are therefore difficult to directly try to achieve the correlation matrix of interference plus noise.Be that CN200910244004.3, name are called in the patent application of " a kind of interference rejection combining method and system " at number of patent application, introduced IRC and calculated ratio juris.The scheme of this patent Introduction is that the estimator that deducts useful signal by receiving signal is obtained the estimator of interference plus noise signals, and then asks for the estimated value of the correlation matrix of interference plus noise.This method is simple and clear, and still, inventor finds, in the time asking for the estimator of useful signal, can use the estimator of channel coefficients.In general, having under interference plus noise condition, the estimator of trying to achieve channel coefficients is all inaccurate, has wherein comprised the impact of interference plus noise.Therefore, there is larger error in the estimated value that uses method described in this patent to try to achieve the correlation matrix of interference plus noise, and then makes the weighting weight vector of trying to achieve comprise larger error, causes well suppressing disturbing and noise, and this has directly affected merging performance.The patent No. is that EP2136521A1, name are called " Method, device and system using interference rejectioncombining in OFDMA " patent from improve precision of channel estimation start with, but, with current technical merit, according to existing system and standard, the raising cost of precision of channel estimation is larger, and performance boost is limited.Be that WO2009060023A2, name are called in the patent of " METHOD AND APPARATUS FOR INTERFERENCE REJECTION COMBINING AND DETECTION " in the patent No., adopt IRC algorithm, but the information that needs known adjacent area to disturb, this point is difficult to real-time implementation in real system.

Inventor's discovery, in correlation technique, in the time disturbing inhibition to merge, accuracy is lower.

Summary of the invention

Main purpose of the present invention is to provide a kind of interference to suppress the scheme that merges, disturbs the lower problem of accuracy while suppressing merging at least to solve in above-mentioned correlation technique.

To achieve these goals, according to an aspect of the present invention, provide a kind of method that suppresses merging of disturbing, the method comprises: the pilot sub-carrier on each Resource Block in the signal receiving on each antenna is divided into respectively to pilot group; The pilot group of the pilot sub-carrier composition to the same position on the same Resource Block in different antennae is carried out computing cross-correlation, obtains the component of each element of interference and noise correlation matrix; Obtain each element according to the component of each element; Use interference and noise correlation matrix to disturb and suppress to merge the data subcarrier on each antenna.The present invention has improved the estimated accuracy of interference plus noise correlation matrix.

Further, the pilot group pilot sub-carrier of the same position on the same Resource Block in different antennae being formed is carried out computing cross-correlation and is comprised: estimate the domain channel response value on each pilot sub-carrier; The domain channel response value of the pilot sub-carrier in the pilot group of the pilot sub-carrier composition to the same position on the same Resource Block of different antennae is carried out computing cross-correlation, obtains interference and the noise correlation estimation value of each pilot group.

To achieve these goals, according to another aspect of the present invention, a kind of device that suppresses merging that disturbs is provided, and this device comprises: grouping module, for the pilot sub-carrier on each Resource Block of the signal receiving on each antenna is divided into respectively to pilot group; Computing module, the pilot group forming for the pilot sub-carrier of the same position on the same Resource Block in different antennae is carried out computing cross-correlation, obtains the component of each element of interference and noise correlation matrix; Acquisition module, for obtaining each element according to the component of each element; Disturb and suppress to merge module, for using interference and noise correlation matrix to disturb and suppress to merge the data subcarrier on each antenna.

Further, computing module comprises: estimator module, for estimating the domain channel response value on each pilot sub-carrier; Operator module, the domain channel response value of the pilot sub-carrier of the pilot group forming for the pilot sub-carrier of the same position on the same Resource Block of different antennae is carried out computing cross-correlation, obtains interference and the noise correlation estimation value of each pilot group.

By the present invention, adopt the interference plus noise correlation matrix estimation mode based on pilot tone, eliminate the impact of interference plus noise in interference plus noise correlation matrix estimation process, thereby improved the estimated accuracy of interference plus noise correlation matrix.

Brief description of the drawings

Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:

Fig. 1 is according to the flow chart of the interference rejection combining method of the embodiment of the present invention;

Fig. 2 is according to the schematic diagram of the ofdm system of the embodiment of the present invention;

Fig. 3 is the time-frequency two-dimensional structure chart according to the ofdm signal of the embodiment of the present invention;

Fig. 4 is the structured flowchart that suppresses the device merging according to the interference of the embodiment of the present invention;

Fig. 5 is according to the structured flowchart of the computing module 44 of the embodiment of the present invention.

Embodiment

Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the application can combine mutually.

Embodiment mono-

The embodiment of the present invention provides a kind of method that suppresses merging of disturbing, and the method is applied to the many antenna OFDM Systems that adopt MIMO technology in wireless communication field.Fig. 1 is that the method comprises according to the flow chart of the interference rejection combining method of the embodiment of the present invention:

Step S102, is divided into respectively pilot group by the pilot sub-carrier on each Resource Block in the signal receiving on each antenna;

For example, base station or terminal arrive signal by antenna reception, then, the pilot sub-carrier on each Resource Block in the signal receiving on each antenna are divided into respectively to pilot group.

Step S104, the pilot group of the pilot sub-carrier composition to the same position on the same Resource Block in different antennae is carried out computing cross-correlation, obtains the component of each element of interference and noise correlation matrix;

Step S106, obtains each element according to the component of each element;

Step S108, uses interference and noise correlation matrix to disturb and suppress to merge the data subcarrier on each antenna.

Wherein, step S108 can adopt the general mode in this area to disturb inhibition to merge, and to its specific implementation, the present invention does not limit.

The present embodiment adopts the interference plus noise correlation matrix estimation mode based on pilot tone, compare with method in the past, the present embodiment can be estimated the correlation matrix of interference and noise more accurately, and then complete interference inhibition merging, play the effect that suppresses co-channel interference, improves received signal quality and elevator system overall performance.

Preferably, step S104 can realize in the following manner: estimate the domain channel response value on each pilot sub-carrier; The domain channel response value of the pilot sub-carrier in the pilot group of the pilot sub-carrier composition to the same position on the same Resource Block of different antennae is carried out computing cross-correlation, obtains interference and the noise correlation estimation value of each pilot group.

Wherein, the pass between the estimated value of the domain channel response value on domain channel response value and each pilot sub-carrier on each pilot sub-carrier is:

Wherein, H _1,1for pilot sub-carrier P _1,1corresponding domain channel response value, H _1,2for pilot sub-carrier P _1,2corresponding domain channel response value, H _3,1for pilot sub-carrier P _3,1corresponding domain channel response value, H _3,2for pilot sub-carrier P _3,2corresponding domain channel response value, for pilot sub-carrier P _1,1the estimated value of corresponding domain channel response value, for pilot sub-carrier P _1,2the estimated value of corresponding domain channel response value, for pilot sub-carrier P _3,1the estimated value of corresponding domain channel response value, for pilot sub-carrier P _3,2the estimated value of corresponding domain channel response value, ε ₁and ε ₂for the physical quantity of setting, these two values cannot know for sure, are the marks of setting for algorithmic derivation, finally can disappear in calculating, and W _1,1for pilot sub-carrier P _1,1the channel estimation errors that corresponding interference plus noise causes, W _1,2for pilot sub-carrier P _1,2the channel estimation errors that corresponding interference plus noise causes, W _3,1for pilot sub-carrier P _3,1the channel estimation errors that corresponding interference plus noise causes, W _3,2for pilot sub-carrier P _3,2the channel estimation errors that corresponding interference plus noise causes.

After the domain channel response value estimating on each pilot sub-carrier, use formula calculate the cross correlation value estimated value R of antenna m and antenna n _{mn, Ns}, wherein, as s=1,2,3 or 4 time, in the time of s=5 or 6, h _{l, k, m}the H of antenna m _{l, k}, H _{p, q, m}the H of antenna m _{p, q}, H _{l, k, n}the H of antenna n _{l, k}, H _{p, q, n}the H of antenna n _{p, q}, in the time of s=1, l=1, k=1, p=1, q=2, in the time of s=2,1=3, k=1, p=3, q=2, in the time of s=3, l=1, k=1, p=3, q=1, in the time of s=4, l=1, k=2, p=3, q=2, in the time of s=5, l=1, k=1, p=3, q=2, in the time of s=6, l=1, k=2, p=3, q=1, N represents to disturb and noise signal, and C represents the signal receiving.

Then, according to R _{mn, N}=R _{mn, N1}+ R _{mn, N2}+ R _{mn, N3}+ R _{mn, N4}-R _{mn, N5}-R _{mn, N6}obtain each element of interference and noise correlation matrix, thereby obtain whole interference and noise correlation matrix.

Compared with prior art, the present embodiment can be estimated the correlation matrix of interference and noise more accurately, and then can estimate more accurately to disturb and suppress to merge (IRC) weight vector, obtain better amalgamation result, and there is higher Signal Interference and Noise Ratio (SINR), meanwhile, improve the performance of physical link layer and the overall performance of elevator system.

Embodiment bis-

Fig. 2 is according to the schematic diagram of the ofdm system of the embodiment of the present invention.Wherein, show the composition of ofdm system physical layer baseband signal processing unit and the flow process of signal processing.As shown in Figure 2, this system is mainly made up of several parts such as antenna system module, radio frequency/intermediate frequency processing unit module, baseband processing unit module and other processing unit module.Wherein, acting as of antenna system module receives the electromagnetic wave signal of propagating in space, and is translated into the signal of telecommunication, radio frequency/intermediate frequency processing unit module comprises the processing such as filtering, shaping, AD conversion, and output digit signals is to baseband processing unit module, baseband processing unit module comprises again fast fourier transform (Fast Fourier Transform, referred to as FFT) module, baseband signal pretreatment unit module, IRC module (many antennas merging processing unit module) and demodulation decoding module, wherein, the effect of FFT module is the time-domain digital signal of radio frequency/IF processing unit module output to be done to FFT process, thereby obtain frequency-region signal, the effect of baseband signal pretreatment unit module is that the frequency-region signal of FFT module output is done to the preliminary treatment that may need, for example, at micro-wave access to global intercommunication (Worldwide Interoperability for Microwave Access, referred to as WiMAX) need to do descrambling code processing in system, the effect of IRC module is the frequency-region signal of each antenna to be done to disturb suppress to merge, obtain many antennas amalgamation result, finally, complete demodulation coding by demodulation coding module, so far complete base band signal process, output decode results is processed to other, other processing are the above each layer of general designations processed of physical layer, and this patent content does not relate to, and does not repeat at this.

The interference rejection combining method that the present embodiment provides is applied in the multi-antenna orthogonal frequency division multiplexing system shown in Fig. 2, and be mainly used in IRC module wherein, realize the estimation to interference and noise correlation matrix, then obtain IRC and merge weight vector, finally complete to disturb and suppress to merge processing.

Fig. 3 is the time-frequency two-dimensional structure chart according to the ofdm signal of the embodiment of the present invention, and as shown in Figure 3, ofdm signal comprises the multiple subcarriers on multiple symbols and the frequency domain in time domain.A Resource Block of several subcarriers composition in time-frequency two-dimensional plane, subcarrier wherein comprises data subcarrier for transmitting data and the pilot sub-carrier for synchronous and channel estimating etc.In general, pilot configuration as shown in Figure 3.The embodiment of the present invention utilizes the Signal estimation on pilot sub-carrier to go out interference and the noise correlation matrix on all subcarriers on this Resource Block, and then by calculating merging weight vector, then the data subcarrier being applied on this Resource Block disturbs inhibition to merge.The implementation step of the interference rejection combining method in the embodiment of the present invention comprises:

1, the pilot sub-carrier on Resource Block is divided into groups.

In Fig. 3, R _{i, j}representative data subcarrier, P _{i, j}represent pilot sub-carrier, wherein, i is the numbering of OFDM symbol in a time frequency unit, and j is the numbering of the interior data subcarrier of the same OFDM symbol of a time frequency unit or pilot sub-carrier.Pilot sub-carrier P _1,1and P _1,2lay respectively on interior the first frequency of first OFDM symbol and the 4th frequency, form first group of pilot sub-carrier; Pilot sub-carrier P _3,1and P _3,2lay respectively on interior the first frequency of the 3rd OFDM symbol and the 4th frequency, form second group of pilot sub-carrier; P _1,1and P _3,1form the 3rd group of pilot sub-carrier; P _1,2and P _3,2form the 4th group of pilot sub-carrier; P _1,1and P _3,2form the 5th group of pilot sub-carrier; P _1,2and P _3,1form the 6th group of pilot sub-carrier.For multiaerial system, the reception signal on every antenna has all occupied identical time/frequency source block, therefore, can in letter mark, add a subscript again and represent antenna sequence number.

2, the domain channel response value on estimating pilot frequency subcarrier.

The present embodiment does not relate to specific channel estimation method and scheme, just utilizes channel response value estimated result.In the present embodiment, establish in Resource Block channel response value model as follows:

In Fig. 3, there are 4 pilot sub-carriers, i.e. P _1,1, P _1,2, P _3,1, P _3,2, its corresponding domain channel response value is respectively H _1,1, P _1,2, H _3,1, H _3,2, and, unequal mutually between each domain channel response value, and domain channel response value estimated value is respectively

If H _1,1with H _1,2between domain channel response variable quantity be ε ₁; H _1,1with H _3,1between time channel variation amount be ε ₂:

$\left\{\begin{array}{c}{H}_{\mathrm{1,2}}=H_{\mathrm{1,1}}+{\mathrm{\ϵ}}_1\\ H_{\mathrm{3,1}}=H_{\mathrm{1,1}}+{\mathrm{\ϵ}}_2\end{array}\right.---\left(1\right)$

The time dependent variable quantity approximately equal of the domain channel response of close subcarrier on frequency domain, therefore H _1,2with H _3,2between also meet following relation:

H _3，2＝H _1，2+ε ₂ (2)

The domain channel response value estimated value of correspondence on pilot sub-carrier can be expressed as:

${\hat{H}}_{i,j}=H_{i,j}+W_{i,j}---\left(3\right)$

Formula (3) has been described with H _{i, j}between relation, wherein, W _{i, j}represent the channel estimation errors that interference plus noise causes.

By formula (3), formula (1) and formula (2) combination, obtain domain channel response value estimated value corresponding on four pilot sub-carriers and be respectively:

$\left\{\begin{array}{c}{\hat{H}}_{\mathrm{1,1}}=H_{\mathrm{1,1}}+W_{\mathrm{1,1}}\\ {\hat{H}}_{\mathrm{1,2}}=H_{\mathrm{1,1}}+W_{\mathrm{1,2}}+{\mathrm{\ϵ}}_1\\ {\hat{H}}_{\mathrm{3,1}}=H_{\mathrm{1,1}}+W_{\mathrm{3,1}}+{\mathrm{\ϵ}}_2\\ {\hat{H}}_{\mathrm{3,2}}=H_{\mathrm{1,1}}+W_{\mathrm{3,2}}+{\mathrm{\ϵ}}_1+{\mathrm{\ϵ}}_2\end{array}\right.---\left(4\right)$

In the time processing the data of many antennas, also need in letter mark, add again a subscript and represent antenna sequence number.

3, calculate interference and the noise correlation estimated value of each pilot subcarrier sets.

Interference on certain subcarrier or Resource Block and the cross-correlation matrix of noise signal should be to do conjugation multiplication by the interference on corresponding subcarrier and noise signal to calculate, but because useful signal cannot separate with noise signal with interference, this direct evaluating method can not be realized.And the present embodiment has utilized channel model above, ask for respectively interference and the noise cross correlation value estimated value of each pilot subcarrier sets, by the results added of each pilot subcarrier sets, eliminate the impact of error amount, can obtain like this than disturbing more accurately and noise correlation matrix from general approach.Introduce the interference of each pilot subcarrier sets and the computational methods of noise cross correlation value estimated value below.

Suppose to ask for the cross correlation value estimated value of antenna m and antenna n, that is, and the element of the capable n row of the m of correlation matrix.

To the first pilot subcarrier sets, the cross correlation value that receives signal is with cross correlation value be:

$R_{\mathrm{mn},1}=\underset{j=1}{\overset{2}{\mathrm{\Σ}}}\left[{\hat{H}}_{1,j,m}{\hat{H}}_{1,j,n}^{*}\right]---\left(5\right)$

with in the estimated value of Signal cross correlation value be:

${\hat{R}}_{\mathrm{mn},C1}={\hat{H}}_{\mathrm{1,1},m}{\hat{H}}_{\mathrm{1,2},n}^{*}+{\hat{H}}_{\mathrm{1,2},m}{\hat{H}}_{\mathrm{1,1},n}^{*}---\left(6\right)$

Therefore, with in the estimated value of interference plus noise cross correlation value be:

${\hat{R}}_{\mathrm{mn},N1}=R_{\mathrm{mn},1}-{\hat{R}}_{\mathrm{mn},C1}---\left(7\right)$

with the Signal cross correlation value of middle reality is:

$R_{\mathrm{mn},C1}=\underset{j=1}{\overset{2}{\mathrm{\Σ}}}\left[H_{1,j,m}{H}_{1,j,n}^{*}\right]---\left(8\right)$

Because actual domain channel response cannot be known, therefore cannot directly use (8) to ask for R _{mn, C1}.Use the estimated value of signal power carry out the calculating of interference plus noise cross correlation value and just introduced error

Further had by (6) formula

${\hat{R}}_{\mathrm{mn},C1}=H_{\mathrm{1,1},m}{H}_{\mathrm{1,2},n}^{*}+H_{\mathrm{1,2},m}+H_{\mathrm{1,1},n}^{*}+U_{\mathrm{mn},1}---\left(9\right)$

U in above formula _{mn, 1}be the cumulative result of gaussian variable of many zero-means, can think U _{mn, 1}be approximately zero.Therefore obtain

${\hat{R}}_{\mathrm{mn},C1}=H_{\mathrm{1,1},m}{H}_{\mathrm{1,2},n}^{*}+H_{\mathrm{1,2},m}{H}_{\mathrm{1,1},n}^{*}---\left(10\right)$

Use carry out the error of the calculating introducing of interference plus noise cross correlation value:

$R_{\mathrm{mn},C1}-{\hat{R}}_{\mathrm{mn},C1}=(H_{\mathrm{1,1},m}-H_{\mathrm{1,2},m})(H_{\mathrm{1,1},n}^{*}-H_{\mathrm{1,2},n}^{*})={\mathrm{\ϵ}}_{1,m}{\mathrm{\ϵ}}_{1,n}^{*}---\left(11\right)$

Therefore, with the cross correlation value R of the interference plus noise of middle reality _{mn, N1}for:

$R_{\mathrm{mn},N1}=R_{\mathrm{mn},1}-R_{\mathrm{mn},C1}=R_{\mathrm{mn},1}-{\hat{R}}_{\mathrm{mn},C1}-{\mathrm{\ϵ}}_{1,m}{\mathrm{\ϵ}}_{1,n}^{*}---\left(12\right)$

In like manner, can obtain with the cross correlation value R of the interference plus noise of middle reality _{mn, N2}for:

$R_{\mathrm{mn},N2}=R_{\mathrm{mn},2}-R_{\mathrm{mn},C2}=R_{\mathrm{mn},2}-{\hat{R}}_{\mathrm{mn},C2}-{\mathrm{\ϵ}}_{1,m}{\mathrm{\ϵ}}_{1,n}^{*}---\left(13\right)$

And the cross correlation value of the 3rd actual interference plus noise in pilot subcarrier sets and the 4th pilot subcarrier sets

$R_{\mathrm{mn},N3}=R_{\mathrm{mn},3}-R_{\mathrm{mn},C3}=R_{\mathrm{mn},3}-{\hat{R}}_{\mathrm{mn},C3}-{\mathrm{\ϵ}}_{2,m}{\mathrm{\ϵ}}_{2,n}^{*}---\left(14\right)$

$R_{\mathrm{mn},N4}=R_{\mathrm{mn},4}-R_{\mathrm{mn},C4}=R_{\mathrm{mn},4}-{\hat{R}}_{\mathrm{mn},C4}-{\mathrm{\ϵ}}_{2,m}{\mathrm{\ϵ}}_{2,n}^{*}---\left(15\right)$

To the 5th pilot subcarrier sets, with cross correlation value be:

$R_{\mathrm{mn},5}={\hat{H}}_{\mathrm{1,1},m}{\hat{H}}_{\mathrm{1,1},n}+{\hat{H}}_{\mathrm{3,2},m}{\hat{H}}_{\mathrm{3,2},n}---\left(16\right)$

with the estimated value of middle Signal cross correlation value for:

${\hat{R}}_{\mathrm{mn},C5}={\hat{H}}_{\mathrm{1,1},m}{\hat{H}}_{\mathrm{3,2},n}^{*}+{\hat{H}}_{\mathrm{3,2},m}{\hat{H}}_{\mathrm{1,1},n}^{*}---\left(17\right)$

with the cross correlation value of middle actual signal is:

$R_{\mathrm{mn},C5}=H_{\mathrm{1,1},m}{H}_{\mathrm{1,1},n}^{*}+H_{\mathrm{3,2},m}{H}_{\mathrm{3,2},n}^{*}---\left(18\right)$

Use carry out the error of the calculating introducing of interference plus noise cross correlation value:

$R_{\mathrm{mn},C5}-{\hat{R}}_{\mathrm{mn},C5}=({\mathrm{\ϵ}}_{1,m}+{\mathrm{\ϵ}}_{2,m}){({\mathrm{\ϵ}}_{1,n}+{\mathrm{\ϵ}}_{2,n})}^{*}---\left(19\right)$

Therefore, with in the estimated value of cross correlation value of interference plus noise be:

$R_{\mathrm{mn},N5}=R_{\mathrm{mn},5}-R_{\mathrm{mn},C5}=R_{\mathrm{mn},5-}{\hat{R}}_{\mathrm{mn},C5}-({\mathrm{\ϵ}}_{1,m}+{\mathrm{\ϵ}}_{2,m}){({\mathrm{\ϵ}}_{1,n}+{\mathrm{\ϵ}}_{2,n})}^{*}---\left(20\right)$

In like manner, can obtain with in interference plus noise cross correlation value:

$R_{\mathrm{mn},N6}=R_{\mathrm{mn},6}-R_{\mathrm{mn},C6}=R_{\mathrm{mn},6-}{\hat{R}}_{\mathrm{mn},C6}-({\mathrm{\ϵ}}_{1,m}-{\mathrm{\ϵ}}_{2,m}){({\mathrm{\ϵ}}_{1,n}-{\mathrm{\ϵ}}_{2,n})}^{*}---\left(21\right)$

4, the interference of each pilot subcarrier sets and noise correlation estimated value are carried out to algebraic operation and obtain final result.

R _mn，N＝R _mn，N1+R _mn，N2+R _mn，N3+R _mn，N4-R _mn，N5-R _mn，N6 (22)

R _mn，N＝R _mn，1-R _mn，C1+R _mn，2-R _mn，C2+R _mn，3-R _mn，C3+R _mn，4-R _mn，C4-R _mn，5

(23)

+R _mn，C5-R _mn，6+R _mn，C6

$R_{\mathrm{mn},N}=R_{\mathrm{mn},1}-{\hat{R}}_{\mathrm{mn},C1}+R_{\mathrm{mn},2}-{\hat{R}}_{\mathrm{mn},C2}+R_{\mathrm{mn},3}-{\hat{R}}_{\mathrm{mn},C3}+R_{\mathrm{mn},4}-{\hat{R}}_{\mathrm{mn},C4}-R_{\mathrm{mn},5}$ (24)

$+{\hat{R}}_{\mathrm{mn},C5}-R_{\mathrm{mn},6}+{\hat{R}}_{\mathrm{mn},C6}$

Due to utilize formula (23) calculate time, ε ₁and ε ₂capital is disappeared, and therefore, formula (23) is of equal value with formula (24).In formula (24), all numerical value all can calculate, thereby finally tries to achieve antenna m and interference and the noise cross correlation value estimated value R of antenna n on Resource Block _{mn, N}, m and n are circulated, get different values, can obtain whole correlation matrix R _n.

It should be noted that, the present embodiment only describes as an example of the OFDM shown in Fig. 3 example, but, the application of the present embodiment is not limited to the ofdm signal shown in Fig. 3, as long as pilot sub-carrier be positioned on four angles of Resource Block or pilot sub-carrier can according to laterally, vertical and diagonal angle grouping, can use the method for the present embodiment to carry out the estimation of correlation matrix, suppress to merge thereby disturb.

The embodiment of the present invention also provides a kind of interference to suppress the device that merges, and this device is used for realizing said method, and this device can be arranged in terminal, base station etc. and have the equipment of many antennas, and this device can be positioned on the signal-processing board of each equipment.

Fig. 4 is the structured flowchart that suppresses the device merging according to the interference of the embodiment of the present invention, and this device comprises: grouping module 42, for the pilot sub-carrier on each Resource Block of the signal receiving on each antenna is divided into respectively to pilot group; Computing module 44, is coupled to grouping module 42, and the pilot group forming for the pilot sub-carrier of the same position on the same Resource Block in different antennae is carried out computing cross-correlation, obtains the component of each element of interference and noise correlation matrix; Acquisition module 46, is coupled to computing module 44, for obtaining each element according to the component of each element; Disturb and suppress to merge module 48, be coupled to acquisition module 46, for using interference and noise correlation matrix to disturb and suppress to merge the data subcarrier on each antenna.Wherein, grouping module 42, computing module 44 and acquisition module 46 can be arranged in the IRC module of equipment.

Fig. 5 is that computing module 44 comprises according to the structured flowchart of the computing module 44 of the embodiment of the present invention: estimator module 52, for estimating the domain channel response value on each pilot sub-carrier; Operator module 54, be coupled to estimator module 52, the domain channel response value that is used for the pilot sub-carrier of the pilot group of the pilot sub-carrier composition to the same position on the same Resource Block of different antennae is carried out computing cross-correlation, obtains interference and the noise correlation estimation value of each pilot group.

Preferably, the pass between the estimated value of the domain channel response value on domain channel response value and each pilot sub-carrier on each pilot sub-carrier is: wherein, H _1,1for pilot sub-carrier P _1,1corresponding domain channel response value, H _1,2for pilot sub-carrier P _1,2corresponding domain channel response value, H _3,1for pilot sub-carrier P _3,1corresponding domain channel response value, H _3,2for pilot sub-carrier P _3,2corresponding domain channel response value, for pilot sub-carrier P _1,1the estimated value of corresponding domain channel response value, for pilot sub-carrier P _1,2the estimated value of corresponding domain channel response value, for pilot sub-carrier P _3,1the estimated value of corresponding domain channel response value, for pilot sub-carrier P _3,2the estimated value of corresponding domain channel response value, ε ₁and ε ₂for the physical quantity of setting, these two values cannot know for sure, are the marks of setting for algorithmic derivation, finally can disappear in calculating, and W _1,1for pilot sub-carrier P _1,1the channel estimation errors that corresponding interference plus noise causes, W _1,2for pilot sub-carrier P _1,2the channel estimation errors that corresponding interference plus noise causes, W _3,1for pilot sub-carrier P _3,1the channel estimation errors that corresponding interference plus noise causes, W _3,2for pilot sub-carrier P _3,2the channel estimation errors that corresponding interference plus noise causes.

Preferably, operator module 54 is for being used formula calculate the cross correlation value estimated value R of antenna m and antenna n _{mn, Ns}, wherein, as s=1,2,3 or 4 time, in the time of s=5 or 6, wherein, H _{l, k, m}the H of antenna m _{l, k}, H _{p, q, m}the H of antenna m _{p, q}, H _{l, k, n}the H of antenna n _{l, k}, H _{p, q, n}the H of antenna n _{p, q}, N represents to disturb and noise signal, and C represents the signal receiving, in the time of s=1, l=1, k=1, p=1, q=2, in the time of s=2, l=3, k=1, p=3, q=2, in the time of s=3, l=1, k=1, p=3, q=1, in the time of s=4, l=1, k=2, p=3, q=2, in the time of s=5, l=1, k=1, p=3, q=2, in the time of s=6, l=1, k=2, p=3, q=1.

Preferably, acquisition module 46 is for using formula R _{mn, N}=R _{mn, N1}+ R _{mn, N2}+ R _{mn, N3}+ R _{mn, N4}-R _{mn, N5}-R _{mn, N6}obtain each element of interference and noise correlation matrix.

The embodiment of the present invention is by adopting the interference plus noise correlation matrix estimation mode based on pilot tone, eliminate the impact of interference plus noise in interference plus noise correlation matrix estimation process, thereby improve the estimated accuracy of interference plus noise correlation matrix, and then promoted entire system performance.

Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on the network that multiple calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, and in some cases, can carry out shown or described step with the order being different from herein, or they are made into respectively to each integrated circuit modules, or the multiple modules in them or step are made into single integrated circuit module to be realized.Like this, the present invention is not restricted to any specific hardware and software combination.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (10)

1. disturb a method that suppresses merging, it is characterized in that, comprising:

Pilot sub-carrier on each Resource Block in the signal receiving on each antenna is divided into respectively to pilot group;

The pilot group of the pilot sub-carrier composition to the same position on the same Resource Block in different antennae is carried out computing cross-correlation, obtains the component of each element of interference and noise correlation matrix;

Obtain described each element according to the component of described each element;

Use described interference and noise correlation matrix to disturb and suppress to merge the data subcarrier on described each antenna.

2. method according to claim 1, is characterized in that, the pilot group of the pilot sub-carrier composition to the same position on the same Resource Block in different antennae is carried out computing cross-correlation and comprised:

Estimate the domain channel response value on each pilot sub-carrier;

The described domain channel response value of the pilot sub-carrier in the pilot group of the pilot sub-carrier composition to the same position on the same Resource Block of different antennae is carried out computing cross-correlation, obtains interference and the noise correlation estimation value of pilot group described in each.

3. method according to claim 2, is characterized in that,

Pass between the estimated value of the domain channel response value on domain channel response value and each pilot sub-carrier on each pilot sub-carrier is:

$\left\{\begin{array}{c}{\hat{H}}_{\mathrm{1,1}}=H_{\mathrm{1,1}}+W_{\mathrm{1,1}}\\ {\hat{H}}_{\mathrm{1,2}}=H_{\mathrm{1,1}}+W_{\mathrm{1,2}}+{\mathrm{\ϵ}}_1\\ {\hat{H}}_{\mathrm{3,1}}=H_{\mathrm{1,1}}+W_{\mathrm{3,1}}+{\mathrm{\ϵ}}_2\\ {\hat{H}}_{\mathrm{3,2}}=H_{\mathrm{1,1}}+W_{\mathrm{3,2}}+{\mathrm{\ϵ}}_1+{\mathrm{\ϵ}}_2\end{array}\right.$

Wherein, H _1,1for pilot sub-carrier P _1,1corresponding domain channel response value, H _1,2for pilot sub-carrier P _1,2corresponding domain channel response value, H _3,1for pilot sub-carrier P _3,1corresponding domain channel response value, H _3,2for pilot sub-carrier P _3,2corresponding domain channel response value, for pilot sub-carrier P _1,1the estimated value of corresponding domain channel response value, for pilot sub-carrier P _1,2the estimated value of corresponding domain channel response value, for pilot sub-carrier P _3,1the estimated value of corresponding domain channel response value, for pilot sub-carrier P _3,2the estimated value of corresponding domain channel response value, ε ₁and ε ₂for the physical quantity of setting, W _1,1for pilot sub-carrier P _1,1the channel estimation errors that corresponding interference plus noise causes, W _1,2for pilot sub-carrier P _1,2the channel estimation errors that corresponding interference plus noise causes, W _3,1for pilot sub-carrier P _3,1the channel estimation errors that corresponding interference plus noise causes, W _3,2for pilot sub-carrier P _3,2the channel estimation errors that corresponding interference plus noise causes.

4. method according to claim 3, is characterized in that, the described domain channel response value of the pilot sub-carrier in the pilot group of the pilot sub-carrier composition to the same position on the same Resource Block of different antennae is carried out computing cross-correlation and comprised:

Use formula calculate the cross correlation value estimated value R of antenna m and antenna n _{mn, Ns}, wherein, as s=1,2,3 or 4 time, $R_{\mathrm{mn},s}={\hat{H}}_{l,k,m}{\hat{H}}_{l,k,n}^{*}+{\hat{H}}_{p,q,m}{\hat{H}}_{p,q,n}^{*},$ In the time of s=5 or 6, $R_{\mathrm{mn},s}={\hat{H}}_{l,k,m}{\hat{H}}_{l,k,n}{+\hat{H}}_{p,q,m}{\hat{H}}_{p,q,n},$ the H of antenna m _l,k, the H of antenna m _p,q, the H of antenna n _l,k, the H of antenna n _p,q, N represents to disturb and noise signal, and C represents the signal receiving, in the time of s=1, l=1, k=1, p=1, q=2, in the time of s=2, l=3, k=1, p=3, q=2, in the time of s=3, l=1, k=1, p=3, q=1, in the time of s=4, l=1, k=2, p=3, q=2, in the time of s=5, l=1, k=1, p=3, q=2, in the time of s=6, l=1, k=2, p=3, q=1.

5. method according to claim 4, is characterized in that, obtains described each element comprise according to the component of described each element:

Use formula R _{mn, N}=R _{mn, N1}+ R _{mn, N2}+ R _{mn, N3}+ R _{mn, N4}-R _{mn, N5}-R _{mn, N6}obtain described each element R _{mn, N}.

6. disturb a device that suppresses merging, it is characterized in that, comprising:

Grouping module, for being divided into respectively pilot group by the pilot sub-carrier on each Resource Block of the signal receiving on each antenna;

Computing module, the pilot group forming for the pilot sub-carrier of the same position on the same Resource Block in different antennae is carried out computing cross-correlation, obtains the component of each element of interference and noise correlation matrix;

Acquisition module, for obtaining described each element according to the component of described each element;

Disturb and suppress to merge module, for using described interference and noise correlation matrix to disturb and suppress to merge the data subcarrier on described each antenna.

7. device according to claim 6, is characterized in that, described computing module comprises:

Estimator module, for estimating the domain channel response value on each pilot sub-carrier;

Operator module, described domain channel response value for the pilot sub-carrier of the pilot group of the pilot sub-carrier composition to the same position on the same Resource Block of different antennae is carried out computing cross-correlation, obtains interference and the noise correlation estimation value of pilot group described in each.

8. device according to claim 7, is characterized in that, the pass between the estimated value of the domain channel response value on domain channel response value and each pilot sub-carrier on each pilot sub-carrier is:

$\left\{\begin{array}{c}{\hat{H}}_{\mathrm{1,1}}=H_{\mathrm{1,1}}+W_{\mathrm{1,1}}\\ {\hat{H}}_{\mathrm{1,2}}=H_{\mathrm{1,1}}+W_{\mathrm{1,2}}+{\mathrm{\ϵ}}_1\\ {\hat{H}}_{\mathrm{3,1}}=H_{\mathrm{1,1}}+W_{\mathrm{3,1}}+{\mathrm{\ϵ}}_2\\ {\hat{H}}_{\mathrm{3,2}}=H_{\mathrm{1,1}}+W_{\mathrm{3,2}}+{\mathrm{\ϵ}}_1+{\mathrm{\ϵ}}_2\end{array}\right.$

Wherein, H _1,1for pilot sub-carrier P _1,1corresponding domain channel response value, H _1,2for pilot sub-carrier P _1,2corresponding domain channel response value, H _3,1for pilot sub-carrier P _3,1corresponding domain channel response value, H _3,2for pilot sub-carrier P _3,2corresponding domain channel response value, for pilot sub-carrier P _1,1the estimated value of corresponding domain channel response value, for pilot sub-carrier P _1,2the estimated value of corresponding domain channel response value, for pilot sub-carrier P _3,1the estimated value of corresponding domain channel response value, for pilot sub-carrier P _3,2the estimated value of corresponding domain channel response value, ε ₁and ε ₂for the physical quantity of setting, W _1,1for pilot sub-carrier P _1,1the channel estimation errors that corresponding interference plus noise causes, W _1,2for pilot sub-carrier P _1,2the channel estimation errors that corresponding interference plus noise causes, W _3,1for pilot sub-carrier P _3,1the channel estimation errors that corresponding interference plus noise causes, W _3,2for pilot sub-carrier P _3,2the channel estimation errors that corresponding interference plus noise causes.

9. device according to claim 8, is characterized in that, described operator module is used for using formula calculate the cross correlation value estimated value R of antenna m and antenna n _{mn, Ns}, wherein, as s=1,2,3 or 4 time, $R_{\mathrm{mn},s}={\hat{H}}_{l,k,m}{\hat{H}}_{l,k,n}^{*}+{\hat{H}}_{p,q,m}{\hat{H}}_{p,q,n}^{*},$ In the time of s=5 or 6, wherein, H _{l, k, m}the H of antenna m _l,k, H _{p, q, m}the H of antenna m _p,q, H _{l, k, n}the H of antenna n _l,k, H _{p, q, n}the H of antenna n _p,q, N represents to disturb and noise signal, and C represents the signal receiving, in the time of s=1, l=1, k=1, p=1, q=2, in the time of s=2, l=3, k=1, p=3, q=2, in the time of s=3, l=1, k=1, p=3, q=1, in the time of s=4, l=1, k=2, p=3, q=2, in the time of s=5, l=1, k=1, p=3, q=2, in the time of s=6, l=1, k=2, p=3, q=1.

10. device according to claim 9, is characterized in that, described acquisition module is used for using formula R _{mn, N}=R _{mn, N1}+ R _{mn, N2}+ R _{mn, N3}+ R _{mn, N4}-R _{mn, N5}-R _{mn, N6}obtain described each element R _{mn, N}.