CN101615941A - A kind of method of measurement of channel matrix rank, device and terminal - Google Patents

Abstract

The invention provides a kind of method of measurement, device and terminal of channel matrix rank, method wherein is applied to radio communication system terminal, the antenna configurations of described wireless communication system is: receive or two four receipts or four two receipts, may further comprise the steps for two two: generate Hermitian matrix A according to channel matrix H; Utilize described Hermitian matrix A structure to have the equation group of the characteristic value of nonnegative real number; Judge the order of described channel matrix H according to the coefficient of described equation group, so that the number of the data flow that sends to terminal is decided in the base station according to described order.The present invention be applicable to have two two receipts, four two receive and terminal of wireless communication system that two four are received antennas, can record two rank ranks of matrix.Reaching under the situation of identical performance, method of measurement operand of the present invention is very little, need not solve an equation, and has avoided opening complex calculation such as radical sign, has improved arithmetic speed.

Description

A kind of method of measurement of channel matrix rank, device and terminal

Technical field

The present invention relates to wireless communication technology field, relate in particular to method of measurement, device and the terminal of the channel matrix rank of a kind of 3GPP of being applied to LTE (LongTerm Evolution) system terminal.

Background technology

For improving the message transmission rate in the wireless communication system, in the wireless communication system-LTE system in future, introduced MIMO (Multiple-Input Multiple-Output, multiple-input and multiple-output) technology, MIMO technology are that the uncorrelated characteristic according to transmission channel between a plurality of antennas improves transmission rate.This just means that the MIMO technology can transmit a plurality of parallel data flow simultaneously in same frequency, irrelevance by channel matrix between the parallel data stream is distinguished, therefore in the mimo system simultaneously the data flow number of parallel transmission depend on the number of the vector that the channel matrix neutral line is irrelevant, also promptly depend on the size of the order of channel matrix.

In the MIMO technology, send signal, the available following formula of the relation of received signal and channel matrix is simply represented:

Y _R×1＝H _R×TX _T×1

In the formula, R represents the reception antenna number, and T represents the transmitting antenna number.H is a channel matrix, the signal vector of X for sending, the signal vector of Y for receiving.

In wireless channel, channel situation is a real-time change, therefore under the situation of using the MIMO technical transmission, terminal must be given the base station with the feedback information of channel matrix rank constantly, and the base station just can be according to the parallel number that sends data flow of situation decision of current channel matrix rank like this.

Present radio communication system terminal generally adopts single transmit antenna and single reception antenna to carry out the transmission of data, and this transmitting-receiving mode can only be transmitted a data flow at most.But for the terminal that adopts many antennas, how accurately to transmit more data stream to terminal becomes problem demanding prompt solution.

Summary of the invention

Determine number accurately in order to make the base station to the data flow of terminal transmission, the invention provides a kind of method of measurement of channel matrix rank, be applied to radio communication system terminal, the antenna configurations of described wireless communication system is: receive or two four receipts or four two receipts, may further comprise the steps for two two:

Generate Hermitian matrix A according to channel matrix H;

Utilize described Hermitian matrix A structure to have the equation group of the characteristic value of nonnegative real number;

Judge the order of described channel matrix H according to the coefficient of described equation group, so that the number of the data flow that sends to terminal is decided in the base station according to described order.

Described step according to channel matrix H generation Hermitian matrix A is specially:

Calculate the less Hermitian matrix A of dimension according to described channel matrix H,

That is, whether judge R, if R＜T, then A less than T _{2 * 2}=H _{R * T}* H _{R * T} ^H

Otherwise, A _{2 * 2}=H _{R * T} ^H* H _{R * T}

Wherein,

R is the reception antenna number;

T is the transmitting antenna number.

The described step of utilizing described Hermitian matrix A to construct the equation group of the characteristic value with nonnegative real number is specially:

Utilize | λ I-A|=0, construct a quadratic equation with one unknown, wherein I is 2 * 2 unit matrix, supposes A _{2 * 2}For:

$A_{2\×2}=\left[\begin{array}{cc}{r}_{11}& r_{12}\\ r_{21}& r_{22}\end{array}\right]$

Then | λ I-A|=0 is specially:

$\left|\begin{array}{cc}{r}_{11}-\mathrm{\λ}& r_{12}\\ r_{21}& r_{22}-\mathrm{\λ}\end{array}\right|=0,$

Be that described quadratic equation with one unknown is λ ²+ b λ+c=0,

Wherein, b=-(r ₁₁+ r ₂₂), c=(r ₁₁r ₂₂-r ₁₂r ₂₁).

Described coefficient according to described equation group judges that the step of the order of described channel matrix H is specially:

Judge Whether greater than Δ, if $\left|\frac{b^2}{c}\right|>\mathrm{\Δ},$ Then the order of matrix A is 1, and promptly the order of channel matrix H is 1;

Otherwise the order of matrix A is 2, and promptly the order of channel matrix H is 2;

Wherein, Δ is the conditional number thresholding of described matrix A.

The present invention also provides a kind of measurement mechanism of channel matrix rank, is applied to radio communication system terminal, and the antenna configurations of described wireless communication system is: receive or two four receipts or four two receipts for two two, described measurement mechanism comprises:

The Hermitian matrix generation module is used for generating Hermitian matrix A according to channel matrix H;

The equation generation module is used to utilize described Hermitian matrix A to generate the equation group of the characteristic value with nonnegative real number;

The rank of matrix judge module is used for the order according to the coefficient judgement channel matrix H of described equation group, so that the number of the data flow that sends to described terminal is decided in the base station according to described order.

The present invention also provides a kind of radio communication system terminal, comprise: the measurement mechanism of channel matrix rank, described measurement mechanism is applied to radio communication system terminal, and the antenna configurations of described wireless communication system is: receive or two four receipts or four two receipts for two two, described measurement mechanism comprises:

The Hermitian matrix generation module is used for generating Hermitian matrix A according to channel matrix H;

The equation generation module is used to utilize described Hermitian matrix A to generate the equation group of the characteristic value with nonnegative real number;

The rank of matrix judge module is used for the order according to the coefficient judgement channel matrix H of described equation group, so that the number of the data flow that sends to described terminal is decided in the base station according to described order.

Compared with prior art, the present invention has following beneficial effect:

The present invention utilizes channel matrix to construct the matrix that a characteristic value is nonnegative real number, obtains equation group according to matrix, and obtains this rank of matrix with the coefficient of equation group.The present invention be applicable to have two two receipts, four two receive and terminal of wireless communication system that two four are received antennas, can record two rank ranks of matrix.Reaching under the situation of identical performance, method of measurement operand of the present invention is very little, need not solve an equation, and has avoided opening complex calculation such as radical sign, has improved arithmetic speed.

Description of drawings

Fig. 1 is the method for measurement flow chart of channel matrix rank of the present invention;

Fig. 2 is the measurement mechanism schematic diagram of channel matrix rank of the present invention.

Embodiment

Method of the present invention be applicable to have two two receipts, four two receive and terminal of wireless communication system that two four are received three kinds of configurations.

The present invention is according to matrix H and A=H ^HH has identical order, and the characteristic value of A all is non-this principle of negative real number, the calculating of channel matrix H order can be converted into the calculating to the order of matrix A.The process of the order of compute matrix A is the quadratic equation with one unknown that utilizes a real number of matrix A structure | λ I-A|=0, the order of utilizing the coefficient of this quadratic equation with one unknown to come judgment matrix H then.

Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.

With reference to figure 1, Fig. 1 is the method for measurement flow chart of channel matrix rank of the present invention, comprises step:

Step 1 generates Hermitian matrix A according to channel matrix H;

Step 2 utilizes the Hermitian matrix structure to have the equation group of the characteristic value of nonnegative real number;

Step 3 is judged the order of channel matrix H according to the coefficient of equation group, so that the number of the data flow that sends to terminal is decided in the base station according to described order.

Below in the LTE system, two two receipts of MIMO dual-mode antenna configuration, four two are received, three kinds of situations of two four receipts, and the implementation process of above-mentioned steps is elaborated.The m here sends out the n receipts and is meant: m is the transmitting antenna number of base station side, and n is meant the reception antenna number of end side.

Step 1:

Suppose channel matrix $H_{R\&times;T}=\left[\begin{array}{ccc}{h}_{11}& \&CenterDot;\&CenterDot;\&CenterDot;& h_{1T}\\ \&CenterDot;\&CenterDot;\&CenterDot;& \&CenterDot;\&CenterDot;\&CenterDot;& \&CenterDot;\&CenterDot;\&CenterDot;\\ {\mathrm{<figure-callout\; id="1"\; label="h\; R"\; filenames="A2009100898910010H1.png"\; state="\{\{state\}\}">h</figure-callout>}}_R& \&CenterDot;\&CenterDot;\&CenterDot;& h_{\mathrm{RT}}\end{array}\right],$ Calculate the less Hermitian matrix A of dimension according to this channel matrix H, concrete steps are as follows:

Whether judge R less than T, if R＜T, then A _{2 * 2}=H _{R * T}* H _{R * T} ^H

Otherwise, A _{2 * 2}=H _{R * T} ^H* H _{R * T}

H _{R * T}* H _{R * T} ^HWith H _{R * T} ^H* H _{R * T}Has identical order.

Here () ^HThe conjugate transpose of representing matrix (), and min (R, T)=2.

If matrix A _{2 * 2}Constitute by following element:

$A_{2\&times;2}=\left[\begin{array}{cc}{r}_{11}& r_{12}\\ r_{21}& r_{22}\end{array}\right]$

Step 2:

According to | λ I-A|=0 constructs a quadratic equation with one unknown group, and wherein I is 2 * 2 unit matrix, and this equation group is specially:

$\left|\begin{array}{cc}{r}_{11}-\mathrm{\&lambda;}& r_{12}\\ r_{21}& r_{22}-\mathrm{\&lambda;}\end{array}\right|=0,$ Be λ ²+ b λ+c=0,

B=-(r wherein ₁₁+ r ₂₂), c=(r ₁₁r ₂₂-r ₁₂r ₂₁).

Step 3: when carrying out the judgement of order, because signal is subjected to noise effect inevitably, so certain (several) individual characteristic value can not occur and be just 0 situation, therefore, order for more effective judgment matrix H, actual often service condition number carries out the judgement of order, and concrete determining step is as follows:

Judge Whether greater than Δ, if $\left|\frac{b^2}{c}\right|>\mathrm{\&Delta;},$ Then the order of matrix A is 1, and promptly the order of channel matrix H is 1,

Otherwise the order of matrix A is 2, and promptly the order of channel matrix H is 2.

Here Δ is the conditional number thresholding of A matrix.The high more representing matrix of conditional number is unstable more, just approaches singular matrix more, the matrix for 2 * 2, and conditional number is high more, just means that also its order approaches 1 more.Therefore this thresholding should be a bigger value.

The present invention also provides a kind of measurement mechanism of channel matrix rank, and with reference to figure 2, Fig. 2 is the measurement mechanism schematic diagram of channel matrix rank of the present invention, comprising:

The Hermitian matrix generation module is used for generating Hermitian matrix A according to channel matrix H;

The equation generation module is used to utilize Hermitian matrix A structure to have the equation group of the characteristic value of nonnegative real number;

The rank of matrix judge module is used for the order according to the coefficient judgement channel matrix H of equation group, so that the number of the data flow that sends to terminal is decided in the base station according to described order.

The specific implementation method of each module corresponds respectively to step 1 above～3, repeats no more here.

To sum up, the present invention utilizes channel matrix to generate to have the new matrix of the characteristic root of nonnegative real number, and according to the new matrix construction that generates quadratic equation with one unknown, determine the order of channel matrix then according to the coefficient of equation.Because the present invention only needs equationof structure, and does not need to solve an equation, therefore, operand of the present invention is very little, has avoided opening complex calculation such as radical sign, only need take advantage of several times to add to obtain rank of matrix, has improved the speed and the accuracy of computing.The present invention is applicable to have four two receipts, two four receipts, and two two terminal of wireless communication system of receiving three kinds of configurations, the scope of application is more extensive.

The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (6)

1. the method for measurement of a channel matrix rank is applied to radio communication system terminal, and the antenna configurations of described wireless communication system is: receive or two four receipts or four two receipts for two two, it is characterized in that, may further comprise the steps:

Generate Hermitian matrix A according to channel matrix H;

Utilize described Hermitian matrix A structure to have the equation group of the characteristic value of nonnegative real number;

Judge the order of described channel matrix H according to the coefficient of described equation group, so that the number of the data flow that sends to terminal is decided in the base station according to described order.

2. method of measurement as claimed in claim 1 is characterized in that, described step according to channel matrix H generation Hermitian matrix A is specially:

Calculate the less Hermitian matrix A of dimension according to described channel matrix H,

That is, whether judge R, if R＜T, then A less than T _{2 * 2}=H _{R * T}* H _{R * T} ^H

Otherwise, A _{2 * 2}=H _{R * T} ^H* H _{R * T}

Wherein,

R is the reception antenna number;

T is the transmitting antenna number.

3. method of measurement as claimed in claim 2 is characterized in that, the described step of utilizing described Hermitian matrix A to construct the equation group of the characteristic value with nonnegative real number is specially:

Utilize | λ I-A|=0, construct a quadratic equation with one unknown, wherein I is 2 * 2 unit matrix, supposes A _{2 * 2}For:

$A_{2\&times;2}=\left[\begin{array}{cc}{r}_{11}& r_{12}\\ r_{21}& r_{22}\end{array}\right]$

Then | λ I-A|=0 is specially:

$\left|\begin{array}{cc}{r}_{11}-\mathrm{\&lambda;}& r_{12}\\ r_{21}& r_{22}-\mathrm{\&lambda;}\end{array}\right|=0,$

Be that described quadratic equation with one unknown is λ ²+ b λ+c=0,

Wherein, b=-(r ₁₁+ r ₂₂), c=(r ₁₁r ₂₂-r ₁₂r ₂₁).

4. method of measurement as claimed in claim 3 is characterized in that, described coefficient according to described equation group judges that the step of the order of described channel matrix H is specially:

Judge Whether greater than Δ, if $\left|\frac{b^2}{c}\right|>\mathrm{\&Delta;},$ Then the order of matrix A is 1, and promptly the order of channel matrix H is 1;

Otherwise the order of matrix A is 2, and promptly the order of channel matrix H is 2;

Wherein, Δ is the conditional number thresholding of described matrix A.

5. the measurement mechanism of a channel matrix rank is applied to radio communication system terminal, and the antenna configurations of described wireless communication system is: receive or two four receipts or four two receipts, it is characterized in that described measurement mechanism comprises for two two:

The Hermitian matrix generation module is used for generating Hermitian matrix A according to channel matrix H;

The equation generation module is used to utilize described Hermitian matrix A to generate the equation group of the characteristic value with nonnegative real number;

The rank of matrix judge module is used for the order according to the coefficient judgement channel matrix H of described equation group, so that the number of the data flow that sends to described terminal is decided in the base station according to described order.

6. radio communication system terminal, comprise: the measurement mechanism of channel matrix rank is characterized in that described measurement mechanism is applied to radio communication system terminal, the antenna configurations of described wireless communication system is: receive or two four receipts or four two receipts for two two, described measurement mechanism comprises:

The Hermitian matrix generation module is used for generating Hermitian matrix A according to channel matrix H;

The equation generation module is used to utilize described Hermitian matrix A to generate the equation group of the characteristic value with nonnegative real number;

The rank of matrix judge module is used for the order according to the coefficient judgement channel matrix H of described equation group, so that the number of the data flow that sends to described terminal is decided in the base station according to described order.

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