CN102469047B - Method and device for judging intensity of user signals - Google Patents

Abstract

The invention discloses a method and a device for judging the intensity of user signals. Corresponding judgment flows are selected according to a fact that a wireless environment type is a noise restricted model or an interference restricted model. When the wireless environment is the noise restricted model, channel energy is obtained according to initial channel estimation values, the channel energy of two antennae is subjected to equal gain combining, and the intensity of the user signals is determined by comparing the combined channel; when the wireless environment is the interference restricted model, whitening matrixes of two users are acquired through computation, initial channel estimation values of the two users are subjected to interference rejection combining (IRC) correction through the whitening matrixes, the channel energy of 2 antennae of the two users is calculated according to the corrected channel estimation values and is subjected to equal gain combining, and the intensity of the user signals is determined by comparing the combined channel energy of the two users.

Description

A kind of determination methods of subscriber signal power and device

Technical field

The present invention relates to mobile communication technology field, in the VAMOS technology relating in particular at gsm system, the determination methods of subscriber signal power and device.

Background technology

Single time slot adaptive multiuser passage voice service VAMOS (Voice Services Over Adaptive Multi-User Channels on One Slot) technology is an important evolution direction of gsm system (global system for mobile communications, Global System for Mobile communication).Because VAMOS is at the up two users' that superposeed reception signal, so when two users are separated respectively to timing, one of them user has just become another user's interference naturally.In order to ensure the quality of subscriber signal demodulation, all to do as last in demodulation to disturb and eliminate.But disturb the key of eliminating to be to know two users' signal, which is strong a little less than which, which user of first demodulation, and then disturb and eliminate which user.

This has just brought the problem that how to judge two users' signal energy power, and the solution of this problem becomes an important technical links processing two users' demodulating process in the gsm system that adopts VAMOS technology.

Summary of the invention

Technical problem to be solved by this invention is, a kind of determination methods and device of subscriber signal power is provided, and for the gsm system adopting VAMOS technology, solves the problem that how to judge two users' signal energy power in two users' demodulating process.

In order to address the above problem, the present invention proposes a kind of determination methods of subscriber signal power, comprising:

Judge that according to scene detection current wireless environment is noise limited model or interference-limited model;

In the time that wireless environment is noise limited model, according to the channel estimation value of 2 antennas of two users, obtain the channel energy of 2 antennas of these two users, channel energy to 2 antennas of two users is carried out equal gain combining, determines the power of subscriber signal by the size of the channel energy after comparison two users' merging;

In the time that wireless environment is interference-limited model, calculate the albefaction matrix that obtains two users, utilize described albefaction matrix to disturb and suppress to merge (IRC) correction two users' initial channel estimation, calculate the channel energy of 2 antennas of two users according to the channel estimation value after proofreading and correct, channel energy to 2 antennas of two users is carried out equal gain combining, determines the power of subscriber signal by the size of the channel energy after comparison two users' merging.

In the time that wireless environment is interference-limited model, the concrete mode of calculating the albefaction matrix that obtains two users is:

First, according to the initial channel estimation of 2 antennas of two users, calculate the energy of the initial channel estimation of 2 antennas of two users, the energy of the initial channel estimation to 2 antennas of two users carries out equal gain combining;

Carry out Timing Advance (TA) search, carry out the channel estimation value of 2 antennas of channel estimating acquisition two users according to described two users' TA value;

Training sequence code (TSC) reconstruct of channel estimation value based on 2 antennas of two users to two users, calculates the correlation matrix of two users' Noise and Interference, and the correlation matrix of described Noise and Interference is decomposed to rear acquisition albefaction matrix.

The present invention also provides a kind of judgment means of subscriber signal power, is connected with scene detection device, comprising:

Noise limited model processing modules, for in the time that scene checkout gear is judged as noise limited model, according to the channel estimation value of 2 antennas of two users, obtain the channel energy of 2 antennas of these two users, channel energy to 2 antennas of two users is carried out equal gain combining, determines the power of subscriber signal by the size of the channel energy after comparison two users' merging;

Interference-limited model processing modules, for in the time that scene checkout gear is judged as interference-limited model, calculate the albefaction matrix that obtains two users, utilize described albefaction matrix to disturb and suppress to merge (IRC) correction two users' initial channel estimation, calculate the channel energy of 2 antennas of two users according to the channel estimation value after proofreading and correct, channel energy to 2 antennas of two users is carried out equal gain combining, determines the power of subscriber signal by the size of the channel energy after comparison two users' merging.

Described interference-limited model processing modules, comprises two user's branch roads and a comparing unit;

Wherein, each user's branch road comprises: matched filtering unit, for carrying out to received signal initial channel estimation, channel estimation value is sent into initial channel estimation merge cells; Initial channel estimation merge cells, for calculate according to channel estimation value this user two antennas initial channel estimation energy and carry out, after equal gain combining, sending into TA search unit; TA search unit, for obtaining this branch road user's TA value, sends into channel estimating unit; Channel estimating unit, for this user is carried out to channel estimating, obtains channel estimation value accurately, sends into estimating noise variance processing unit; Estimating noise variance processing unit, according to the channel estimation value accurately obtaining after channel estimating, obtains the correlation matrix of user's Noise and Interference, exports resolving cell to; Resolving cell, for decomposing and obtain lower triangular matrix according to the correlation matrix of user's Noise and Interference; Albefaction module, for obtaining albefaction matrix according to lower triangular matrix, utilizes albefaction matrix to carry out albefaction processing to the channel estimation value obtaining from matched filtering unit, and albefaction is sent into albefaction energy merge cells after processing; Albefaction energy merge cells, calculates this user's two antenna energy values and carries out, after equal gain combining, sending into comparing unit according to albefaction channel estimation value after treatment;

Comparing unit, for the channel energy after two users that two branch roads are sent here equal gain combining separately with compare, thereby determines two users' power.

Further, described noise limited model processing modules, comprises two user's branch roads and a comparing unit, wherein:

Each user's branch road comprises: matched filtering unit, for carrying out to received signal initial channel estimation, channel estimation value is sent into energy merge cells; Energy merge cells, for calculate according to channel estimation value this user two antennas initial channel estimation energy and carry out equal gain combining and obtain this user's channel estimating energy, send into comparing unit;

Comparing unit, for channel estimating energy separately of two users that two branch roads are sent here with compare, thereby determines two users' power.

The determination methods and the device that adopt subscriber signal power of the present invention, can be in the time reaching certain Signal to Interference plus Noise Ratio, the accuracy of two users' the strong and weak judgement of signal significantly strengthened, thereby lay the foundation for follow-up demodulation process.

Brief description of the drawings

Fig. 1 is the strong and weak decision flow chart of two users' signal that adopts the MTS0 model of noise limited;

Fig. 2 is the strong and weak decision flow chart of two users' signal that adopts interference-limited MTS1 model;

Fig. 3 is the device schematic diagram of judgement subscriber signal power of the present invention.

Embodiment

For making the object, technical solutions and advantages of the present invention clearer, hereinafter in connection with accompanying drawing, embodiments of the invention are elaborated.It should be noted that, in the situation that not conflicting, the combination in any mutually of the feature in embodiment and embodiment in the application.

For adopting the gsm system of VAMOS technology processing in two users' demodulating process, need to first judge the problem of two users' signal power.The present invention proposes the type that judges described wireless environment according to scene, again according to wireless environment type, be chosen in the method that two users' power is judged under noise limited model or interference-limited model, can effectively solve the problem of the strong and weak judgement of two users.

The determination methods of a kind of subscriber signal power of the present invention, comprising:

Judge that according to scene detection current wireless environment is noise limited model or interference-limited model;

In the time that wireless environment is noise limited model, according to the channel estimation value of 2 antennas of two users, obtain the channel energy of 2 antennas of these two users, channel energy to 2 antennas of two users is carried out equal gain combining, determines the power of subscriber signal by the size of the channel energy after comparison two users' merging;

In the time that wireless environment is interference-limited model, calculate the albefaction matrix that obtains two users, utilize described albefaction matrix to disturb and suppress to merge (IRC) correction two users' initial channel estimation, calculate the channel energy of 2 antennas of two users according to the channel estimation value after proofreading and correct, channel energy to 2 antennas of two users is carried out equal gain combining, determines the power of subscriber signal by the size of the channel energy after comparison two users' merging.

Further, in the time that wireless environment is interference-limited model, the concrete mode of calculating the albefaction matrix that obtains two users is:

First, according to the initial channel estimation of 2 antennas of two users, calculate the energy of 2 antenna initial channel estimation of two users, the energy of 2 antenna initial channel estimation of two users is carried out to equal gain combining;

Carry out Timing Advance (TA) search, carry out the channel estimation value of 2 antennas of channel estimating acquisition two users according to described two users' TA value;

Channel estimation value based on 2 antennas of two users and two users' training sequence code (TSC) is reconstructed to received signal, calculate the correlation matrix of two users' Noise and Interference, the correlation matrix of described Noise and Interference is decomposed to rear acquisition albefaction matrix.

When concrete enforcement, first prerequisite is to obtain wireless environment type by scene detection, judges that current wireless environment is noise limited model (MTS0) or interference-limited model (MTS1).MTS0 model and interference-limited MTS1 model for noise limited adopt respectively the strong and weak handling process judging of corresponding subscriber signal.

The MTS0 model of noise limited:

As shown in Figure 1, adopt the model of noise limited to judge that the flow process of subscriber signal power comprises the steps:

Step 101, obtains the initial channel estimation h' of 2 antennas of two users by relevant method _m0, h' _s0, h' _m1, h' _s1, wherein, subscript " M " represents main collection, and " S " represents diversity, and " 0 " represents user 0, and " 1 " represents user 1, all adopts above-mentioned method for expressing in following steps;

Wherein, by two antenna receiving signals $y\left(n\right)=\left[\begin{array}{c}{y}_M\left(n\right)\\ y_S\left(n\right)\end{array}\right]$ The filtering of training sequence part Data Matching, can obtain two users' 2 antennas initial channel estimation separately $\left[\begin{array}{c}{h}_{M0}^{\′}\\ h_{S0}^{\′}\end{array}\right],\left[\begin{array}{c}{h}_{M1}^{\′}\\ h_{S1}^{\′}\end{array}\right],l=0~N_0.$

Step 102, the channel energy of 2 antennas of calculating two users $E_{S0}=\underset{i=1}{\overset{16}{\mathrm{\Σ}}}{\left|h_{S0}^{\′}\left(i\right)\right|}^2,E_{M1}=\underset{i=1}{\overset{16}{\mathrm{\Σ}}}{\left|h_{M1}^{\′}\left(i\right)\right|}^2,E_{S1}=\underset{i=1}{\overset{16}{\mathrm{\Σ}}}{\left|h_{S1}^{\′}\left(i\right)\right|}^2;$

Step 103, carries out equal gain combining to the channel energy of 2 antennas of two users, and the channel energy after merging is E ₀=E _m0+ E _s0, E ₁=E _m1+ E _s1.

Step 104, relatively E ₀with E ₁size, if E ₀>E ₁, user 0 is strong user so; If E ₁>E ₀, user 1 is strong user so.

Interference-limited MTS1 model:

As shown in Figure 2, adopt interference-limited model to judge that the flow process of subscriber signal power comprises the steps:

Step 201, obtains the initial channel estimation h' of 2 antennas of two users by relevant method _m0, h' _s0, h' _m1, h' _s1;

Wherein, to two antenna receiving signals $y\left(n\right)=\left[\begin{array}{c}{y}_M\left(n\right)\\ y_S\left(n\right)\end{array}\right]$ The filtering of training sequence part Data Matching, obtain two users' 2 antennas initial channel estimation separately $\left[\begin{array}{c}{h}_{M0}^{\′}\\ h_{S0}^{\′}\end{array}\right],\left[\begin{array}{c}{h}_{M1}^{\′}\\ h_{S1}^{\′}\end{array}\right],l=0~N_0.$

Step 202, carries out equal gain combining to the energy of two users' 2 antenna initial channel estimation, and after merging, two users' channel energy is separately respectively:

E ₀(l)＝|h' _M0(l)| ²+|h' _S0(l)| ²，E ₁(l)＝|h' _M1(l)| ²+|h' _S1(l)| ²，l＝0～N ₀。

Step 203, to the user's 0 who obtains in step 202 channel energy E ₀(l), user 1 channel energy E ₁(l) carry out respectively TA (Timing Advance, Timing Advance) search, obtain two users' TA value, be designated as respectively TA0, TA1.The Chinese patent application that the process of carrying out TA search can be " CN200710112358.4 " referring to number of patent application.

Step 204, obtaining, on the basis of TA0, TA1, respectively two users' signal being carried out to channel estimating, obtains channel estimating h more accurately _m0(l), h _s0(l), h _m1(l), h _s1(l), l=0～L, utilizes TSC (training sequence) to carry out signal reconstruction, calculates Noise and Interference mixed signal main, diversity: u _m(k)=y _m(k)-h _m* Tsc; u _s(k)=y _s(k)-h _s* Tsc, wherein k=5～25, y ₀(k), y ₁(k) the corresponding signal y that receives _i(n) the training sequence part data in.And then obtain noise variance matrix and be:

$R_{\mathrm{uu}}=\left[\begin{array}{cc}E\left[u_M\left(k\right)u_M^H\left(k\right)\right]& E\left[u_M\left(k\right)u_S^H\left(k\right)\right]\\ E\left[u_S\left(k\right)u_M^H\left(k\right)\right]& E\left[u_S\left(k\right)u_S^H\left(k\right)\right]\end{array}\right]=\left[\begin{array}{cc}{Q}_{11}& Q_{12}\\ Q_{21}& Q_{22}\end{array}\right].$

Wherein, refer to u _m(k) the conjugation transformation of ownership; E represents u _m(k) desired value of inner product.Calculate the correlation matrix R of two users' Noise and Interference _uu0, R _uu1.

Step 205, by Cholesky resolution theory, R _uucan be expressed as R _uu=RR ^t, wherein R is lower triangular matrix, the computing formula of R can be defined and can be obtained by Cholesky:

$R=\left[\begin{array}{cc}{g}_{11}& 0\\ g_{21}& g_{22}\end{array}\right],$

Wherein $g_{11}=\sqrt{Q_{11}},$ Real number; $g_{21}=\frac{Q_{21}}{g_{11}},$ Plural number; real number.Wherein g ₂₁conjugation.

Finally can try to achieve albefaction matrix according to R $w=R^{-1}=\left[\begin{array}{cc}{g}_{22}& 0\\ -g_{21}& g_{11}\end{array}\right].$

Step 206, with albefaction matrix w, to user 0 initial channel estimation $\left[\begin{array}{c}{h}_{M0}^{\′}\left(l\right)\\ h_{S0}^{\′}\left(l\right)\end{array}\right],l=0~N_0$ Carry out albefaction correction, obtain the channel estimating after proofreading and correct

In like manner, can obtain user 1 albefaction proofread and correct after channel estimating $\left[\begin{array}{c}{h}_{\mathrm{wM}1}^{\′}\left(l\right)\\ h_{\mathrm{wS}1}^{\′}\left(l\right)\end{array}\right].$

Step 207, the channel estimating after proofreading and correct according to albefaction, the channel energy of 2 antennas of calculating two users:

$E_{\mathrm{wM}0}=\underset{i=1}{\overset{16}{\mathrm{\Σ}}}{\left|h_{\mathrm{wM}0}^{\′}\left(i\right)\right|}^2,E_{\mathrm{wS}0}=\underset{i=1}{\overset{16}{\mathrm{\Σ}}}{\left|h_{\mathrm{wS}0}^{\′}\left(i\right)\right|}^2,E_{\mathrm{wM}1}=\underset{i=1}{\overset{16}{\mathrm{\Σ}}}{\left|h_{\mathrm{wM}1}^{\′}\left(i\right)\right|}^2,E_{\mathrm{wS}1}=\underset{i=1}{\overset{16}{\mathrm{\Σ}}}{\left|h_{\mathrm{wS}1}^{\′}\left(i\right)\right|}^2.$

Step 208, carries out equal gain combining to the channel energy after albefaction is proofreaied and correct of 2 antennas of two users, and the channel energy after merging is E ₀=E _wM0+ E _wS0, E ₁=E _wM1+ E _wS1.

Step 209, relatively E ₀with E ₁size, if E ₀>E ₁, user 0 is strong user so; If E ₁>E ₀, user 1 is strong user so.

As shown in Figure 3, a kind of judgment means of subscriber signal power, is connected with scene detection device, comprising:

Noise limited model processing modules, for in the time that scene checkout gear is judged to noise limited model, according to the channel estimation value of 2 antennas of two users, obtain the channel energy of 2 antennas of these two users, channel energy to 2 antennas of two users is carried out equal gain combining, determines the power of subscriber signal by the size of the channel energy after comparison two users' merging;

Interference-limited model processing modules, for in the time that scene checkout gear is judged as interference-limited model, calculate the albefaction matrix that obtains two users, utilize described albefaction matrix to disturb and suppress to merge (IRC) correction two users' initial channel estimation, calculate the channel energy of 2 antennas of two users according to the channel estimation value after proofreading and correct, channel energy to 2 antennas of two users is carried out equal gain combining, determines the power of subscriber signal by the size of the channel energy after comparison two users' merging.

Scene detection device, for judging that according to wireless environment detection the type of current wireless environment is noise limited model, or interference-limited model.For the detection technique of wireless environment type, can adopt multiple prior art to realize, be not particularly limited and illustrate in this present invention.

As shown in Figure 1, described noise limited model processing modules, comprises two user's branch roads and a comparing unit, and wherein, each user's branch road comprises:

Matched filtering unit, for carrying out to received signal initial channel estimation, sends channel estimation value into energy merge cells;

Energy merge cells, for calculate according to channel estimation value this user two antennas initial channel estimation energy and carry out equal gain combining and obtain this user's channel estimating energy, send into comparing unit.

Comparing unit, for channel estimating energy separately of two users that two branch roads are sent here with compare, thereby determines two users' power.

As shown in Figure 2, described interference-limited model processing modules, comprises two user's branch roads and a comparing unit; Wherein, each user's branch road comprises:

Matched filtering unit, for carrying out to received signal initial channel estimation, sends channel estimation value into initial channel estimation merge cells;

Initial channel estimation merge cells, for calculate this user's the initial channel estimation of two antennas according to channel estimation value, then is converted into energy and carries out, after equal gain combining, sending into TA search unit;

TA search unit, for obtaining this branch road user's TA value, sends into channel estimating unit;

Channel estimating unit, for this user is carried out to channel estimating, obtains channel estimation value accurately, sends into estimating noise variance processing unit;

Estimating noise variance processing unit, according to the channel estimation value accurately obtaining after channel estimating, obtains the correlation matrix of user's Noise and Interference, exports resolving cell to;

Resolving cell, for decomposing and obtain lower triangular matrix according to the correlation matrix of user's Noise and Interference;

Albefaction unit, for obtaining albefaction matrix according to lower triangular matrix, utilizes albefaction matrix to carry out albefaction processing to the channel estimation value obtaining from matched filtering unit, and albefaction is sent into albefaction energy merge cells after processing;

Albefaction energy merge cells, calculates this user's two antenna energy values and carries out, after equal gain combining, sending into comparing unit according to albefaction channel estimation value after treatment.

Comparing unit, for the channel energy after two users that two branch roads are sent here equal gain combining separately with compare, thereby determines two users' power.

The foregoing is only embodiments of the 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 claim scope of the present invention.

Claims (3)

1. a determination methods for subscriber signal power, comprising:

Judge that according to scene detection current wireless environment is noise limited model or interference-limited model;

In the time that wireless environment is noise limited model, according to the channel estimation value of 2 antennas of two users, obtain the channel energy of 2 antennas of these two users, channel energy to 2 antennas of two users is carried out equal gain combining, determines the power of subscriber signal by the size of the channel energy after comparison two users' merging;

In the time that wireless environment is interference-limited model, calculate the albefaction matrix that obtains two users, utilize described albefaction matrix to disturb and suppress to merge IRC correction two users' initial channel estimation, calculate the channel energy of 2 antennas of two users according to the channel estimation value after proofreading and correct, channel energy to 2 antennas of two users is carried out equal gain combining, determines the power of subscriber signal by the size of the channel energy after comparison two users' merging;

Described in the time that wireless environment is interference-limited model, the albefaction matrix that calculates acquisition two users is:

First, according to the initial channel estimation of 2 antennas of two users, calculate the energy of the initial channel estimation of 2 antennas of two users, the energy of the initial channel estimation to 2 antennas of two users carries out equal gain combining;

Carry out Timing Advance TA search, carry out the channel estimation value of 2 antennas of channel estimating acquisition two users according to described two users' TA value;

The training sequence code TSC reconstruct of channel estimation value based on 2 antennas of two users to two users, calculates the correlation matrix of two users' Noise and Interference, and the correlation matrix of described Noise and Interference is decomposed to rear acquisition albefaction matrix.

2. a judgment means for subscriber signal power, is connected with scene detection device, comprising:

Noise limited model processing modules, for in the time that scene checkout gear is judged as noise limited model, according to the channel estimation value of 2 antennas of two users, obtain the channel energy of 2 antennas of these two users, channel energy to 2 antennas of two users is carried out equal gain combining, determines the power of subscriber signal by the size of the channel energy after comparison two users' merging;

Interference-limited model processing modules, for in the time that scene checkout gear is judged as interference-limited model, calculate the albefaction matrix that obtains two users, utilize described albefaction matrix to disturb and suppress to merge IRC correction two users' initial channel estimation, calculate the channel energy of 2 antennas of two users according to the channel estimation value after proofreading and correct, channel energy to 2 antennas of two users is carried out equal gain combining, determines the power of subscriber signal by the size of the channel energy after comparison two users' merging;

Described interference-limited model processing modules, comprises two user's branch roads and a comparing unit;

Wherein, each user's branch road comprises: matched filtering unit, for carrying out to received signal initial channel estimation, channel estimation value is sent into initial channel estimation merge cells; Initial channel estimation merge cells, for calculate according to channel estimation value this user two antennas initial channel estimation energy and carry out, after equal gain combining, sending into TA search unit; TA search unit, for obtaining this branch road user's TA value, sends into channel estimating unit; Channel estimating unit, for this user is carried out to channel estimating, obtains channel estimation value accurately, sends into estimating noise variance processing unit; Estimating noise variance processing unit, according to the channel estimation value accurately obtaining after channel estimating, obtains the correlation matrix of user's Noise and Interference, exports resolving cell to; Resolving cell, for decomposing and obtain lower triangular matrix according to the correlation matrix of user's Noise and Interference; Albefaction module, for obtaining albefaction matrix according to lower triangular matrix, utilizes albefaction matrix to carry out albefaction processing to the channel estimation value obtaining from matched filtering unit, and albefaction is sent into albefaction energy merge cells after processing; Albefaction energy merge cells, calculates this user's two antenna energy values and carries out, after equal gain combining, sending into comparing unit according to albefaction channel estimation value after treatment; Comparing unit, for the channel energy after two users that two branch roads are sent here equal gain combining separately with compare, thereby determines two users' power.

3. device as claimed in claim 2, is characterized in that, described noise limited model processing modules comprises two user's branch roads and a comparing unit, wherein:

Each user's branch road comprises: matched filtering unit, for carrying out to received signal initial channel estimation, channel estimation value is sent into energy merge cells;

Energy merge cells, for calculate according to channel estimation value this user two antennas initial channel estimation energy and carry out equal gain combining and obtain this user's channel estimating energy, send into comparing unit;

Comparing unit, for channel estimating energy separately of two users that two branch roads are sent here with compare, thereby determines two users' power.