CN1852277B - Channel estimation normalizing method and device for common distribution mode - Google Patents

Abstract

Using this user's physical coded combination transfers information of channel. After detecting out information of active training sequence assigned to this user, or information of power of each active code channel, the method carries out normalization process for estimated value of channel of target user. When down going transmission power is different, the disclosed normalization method for estimating channel in TDS-CDMA system carries out relevant power adjustment for different code channels in order to raise combined testing accuracy of correlation matrix in time reconstructed system.

Description

Method for normalizing and device in the estimation of public distributing mode lower channel

Technical field

The present invention relates to the method for normalizing of channel estimating in a kind of TD-SCDMA (TD SDMA) system, specifically, is a kind of relating in TD-SCDMA system under public distributing mode channel estimating to be carried out normalized method and device.

Background technology

In the receiving system of TD-SCDMA system, the method of salary distribution of movement training sequence is determined by network layer in the whole system, the movement training sequence method of salary distribution of whole system has three kinds: default distributing mode (DEFAULT MODE), public distributing mode (COMMON MODE) and assigned distributing mode by user (UESPECFIC MODE), as shown in Figure 1.

In the method for salary distribution of different transfer training series, the method of salary distribution of the length channel estimating resource that system is limited is different: when the method for salary distribution of system's movement training sequence is public distributing mode, only comprise an effective channel estimation window in the estimating window of whole system, this estimating window is each user's a common signal channel estimating window, for all users take jointly; When the method for salary distribution of system's movement training sequence is assigned distributing mode by user, the channel estimating of different user will specially be assigned to corresponding estimating window of user and the combination of the code channel method of salary distribution by system; When the method for salary distribution of system's movement training sequence is default distributing mode, system will be according to the code channel that the user distributed of agreement defined, information distribution according to the pairing movement training sequence of agreement is given each user, in the time of a plurality of shift sequence of activating as certain targeted customer, the power of each shift sequence is suitable with corresponding each code channel gross power.

In the detection algorithm of routine, owing to, different code channels is not carried out the adjustment of corresponding power when downlink transmission power occurring different the time, so in joint-detection, the correlation matrix of reconfiguration system that can't be correct causes performance loss.

Summary of the invention

The object of the present invention is to provide a kind of method for normalizing and device of estimating at the public distributing mode lower channel, by physical coded combination transfers information (CCTrCH) information that makes full use of this user, after the information that detects the active training sequence of distributing to this user, to belonging to same targeted customer's channel estimation value normalization, effectively improve systematic function.

For achieving the above object, the invention provides a kind of method for normalizing of estimating at the public distributing mode lower channel, be used for TDS-CDMA system; Comprise following steps: calculate the power P k of each channel code of current physical coded combination transfers information, and obtain the power information tabulation PowerList={P of each code channel _K1P _K2... P _Kn; Each channel code is activated detection, obtain the activation situation of this targeted customer's current physical coded combination transfers information and other users' channel code; The pairing channel of code channel of each activation of current physical coded combination transfers information is carried out the normalized of channel estimating.

The power P of calculating channel sign indicating number _kMethod be:

$P_k=\underset{n=1}{\overset{N_{\mathrm{cd}}}{\mathrm{\Σ}}}{\left|\right|{\hat{d}}_n^{(2,k)}\left|\right|}^2;$

Wherein,

N symbol representing k code channel;

N _CdBe the characteristic symbol calculating number of setting in advance that active coding detects that carries out, the data number of power calculation is carried out in expression.

The method of carrying out the normalized of channel estimating is:

Wherein, set U represents all activated code channel complete or collected works of current physical coded combination transfers information;

N represents n code channel;

K represents k channel estimating point in the whole channel estimation window;

The channel estimation value of k channel estimating point in the whole channel estimation window of h (k) expression;

p _nThe code channel power of representing n code channel;

α represents the adjustment factor of the amplitude information of channel estimation value, prevents that channel estimation value is excessive or too small.

When carrying out the normalized of channel estimating, when targeted customer's current physical coded combination transfers information takies a plurality of code channel, and when having the activated code channel of surpassing to exist in these code channels, then need at first the channel power of this physical coded combination transfers information is averaged, carry out the normalized of channel estimating again, specifically comprise following steps:

Step 3.1, the power of all activated code channel of current physical coded combination transfers information is averaged;

Step 3.2, the channel estimating of the pairing activated code channel of current physical coded combination transfers information is carried out normalized.

In the described step 3.1, the method that the power of all activated code channel of current physical coded combination transfers information is averaged is:

$\stackrel{\‾}{P}=\frac{\underset{j}{\overset{Y}{\mathrm{\Σ}}}{P}_{\mathrm{kj}}}{Y};$

Wherein, Y represents all activated code channel set of current physical coded combination transfers information.

In the described step 3.2, the method for the channel estimating of the pairing activated code channel of current physical coded combination transfers information being carried out normalized is:

Wherein, set U represents all activated code channel complete or collected works of current physical coded combination transfers information;

N represents n code channel;

K represents k channel estimating point in the whole channel estimation window;

The channel estimation value of k channel estimating point in the whole channel estimation window of h (k) expression;

P _nThe code channel average power of representing n code channel;

α represents the adjustment factor of the amplitude information of channel estimation value, prevents that channel estimation value is excessive or too small.

A kind of normalization device of estimating at the public distributing mode lower channel is used for TDS-CDMA system; Comprise: calculate the power model of each channel code, calculate the power P of each channel code of current physical coded combination transfers information _k, and obtain the power information tabulation PowerList={P of each code channel _K1, P _K2... P _Kn; Each channel code is activated the module of detection, obtain the activation situation of this targeted customer's current physical coded combination transfers information and other users' channel code; The normalization module of the channel estimating of each channel code is carried out the normalized of channel estimating to the pairing channel of code channel of each activation of current physical coded combination transfers information.

The method for normalizing of channel estimating in a kind of TDS-CDMA system provided by the invention, the information of CCTrCH by making full use of this user, after the information that detects the active training sequence of distributing to this user, the channel estimation value that belongs to same targeted customer is merged the ability of opposing interference of effectively raising system and noise.

Description of drawings

Fig. 1 is the schematic diagram of the allocation model of the movement training sequence in the TDS-CDMA system in the background technology;

Fig. 2 is the flow chart of the present invention at the method for normalizing of public distributing mode lower channel estimation;

Fig. 3 is the normalization device schematic diagram in the estimation of public distributing mode lower channel of Fig. 2;

Fig. 4 is the flow chart of the present invention's normalized when targeted customer's current C CTrCH takies a plurality of code channel under public distributing mode.

Embodiment

Below, introduce specific embodiments of the invention in detail, so that further understand content of the present invention by Fig. 2～Fig. 4.

The method for normalizing of channel estimating in a kind of TDS-CDMA system, it is used in the situation that system adopts public distributing mode (COMMON MODE) that movement training sequence is distributed, and as shown in Figure 2, it specifically comprises following steps:

The power P of each channel code of step 21, calculating current C CTrCH _k, and obtain the power information tabulation PowerList={P of each code channel _K1P _K2... P _Kn;

Step 22, each channel code is activated detection, obtain the activation situation of this targeted customer's current C CTrCH and other users' channel code;

Step 23, the normalized of channel estimating that the pairing channel of code channel of each activation of current C CTrCH carried out.

In the described step 1, the power P of calculating channel sign indicating number _kMethod be:

$P_k=\underset{n=1}{\overset{N_{\mathrm{cd}}}{\mathrm{\Σ}}}{\left|\right|{\hat{d}}_n^{(2,k)}\left|\right|}^2;$

Wherein,

N symbol representing k code channel; N _CdBe the characteristic symbol calculating number of setting in advance that active coding detects that carries out, the data number of power calculation is carried out in expression.

In the described step 23, the method for carrying out the normalized of channel estimating is:

Wherein, set U represents all activated code channel complete or collected works of current C CTrCH;

N represents n code channel;

K represents k channel estimating point in the whole channel estimation window;

The channel estimation value of k channel estimating point in the whole channel estimation window of h (k) expression;

P _nThe code channel power of representing n code channel;

α represents the adjustment factor of coefficient, and the amplitude information that it adjusts channel estimation value prevents the excessive or too small situation of channel estimation value.

In the described step 23, when targeted customer's current C CTrCH takies a plurality of code channel, and when having the activated code channel of surpassing to exist in these code channels, then need at first the channel power of this CCTrCH is averaged, carry out the normalized of channel estimating again, as shown in Figure 4, it specifically comprises following steps:

Step 3.1, the power of all activated code channel of current C CTrCH is averaged;

Step 3.2, the channel estimating of the pairing activated code channel of current C CTrCH is carried out normalized.

In the described step 3.1, the method that the power of all activated code channel of current C CTrCH is averaged is:

$\stackrel{\‾}{P}=\frac{\underset{j}{\overset{Y}{\mathrm{\Σ}}}{P}_{\mathrm{kj}}}{Y};$

Wherein, Y represents all activated code channel set of current C CTrCH.

In the described step 3.2, the method for the channel estimating of the pairing activated code channel of current C CTrCH being carried out normalized is:

Wherein, set U represents all activated code channel complete or collected works of current C CTrCH;

N represents n code channel;

K represents k channel estimating point in the whole channel estimation window;

The channel estimation value of k channel estimating point in the whole channel estimation window of h (k) expression;

P _nThe code channel average power of representing n code channel;

α represents the adjustment factor of coefficient, and the amplitude information that it adjusts channel estimation value prevents the excessive or too small situation of channel estimation value.

Fig. 3 is the normalization device schematic diagram in the estimation of public distributing mode lower channel of Fig. 2.As shown in the figure, this device comprises the power model 31 of each channel code of calculating that links to each other successively, and each channel code is activated detection module 32, and the normalization module 33 of the channel estimating of each channel code.

The method for normalizing of channel estimating in a kind of TDS-CDMA system provided by the invention, the information of the physical coded combination transfers information by making full use of this user, when downlink transmission power is different, different code channels is carried out the adjustment of corresponding power, the accuracy of the correlation matrix of the time reconstructed system of raising joint-detection effectively improves receptivity.

Claims (7)

1. a method for normalizing of estimating at the public distributing mode lower channel is used for TDS-CDMA system; It is characterized in that, comprise following steps:

Calculate the power P of each channel code of current physical coded combination transfers information _k, and obtain the power information tabulation PowerList={P of each code channel _K1P _K2... P _Kn;

Each channel code is activated detection, obtain the activation situation of this targeted customer's current physical coded combination transfers information and other users' channel code;

The pairing channel of code channel of each activation of current physical coded combination transfers information is carried out the normalized of channel estimating

Wherein, set U represents all activated code channel complete or collected works of current physical coded combination transfers information;

N represents n code channel;

K represents k channel estimating point in the whole channel estimation window;

The channel estimation value of k channel estimating point in the whole channel estimation window of h (k) expression;

Pn represents the code channel power of n code channel;

α represents the adjustment factor of the amplitude information of channel estimation value, prevents that channel estimation value is excessive or too small.

2. a kind of method for normalizing of estimating at the public distributing mode lower channel as claimed in claim 1 is characterized in that the power P of calculating channel sign indicating number _kMethod be:

$P_k=\underset{n=1}{\overset{N_{\mathrm{cd}}}{\mathrm{\Σ}}}{\left|\right|{\hat{d}}_n^{(2,k)}\left|\right|}^2;$

Wherein, N symbol representing k code channel;

N _CdBe the characteristic symbol calculating number of setting in advance that active coding detects that carries out, the data number of power calculation is carried out in expression.

3. the method for normalizing of estimating at the public distributing mode lower channel as claimed in claim 1, it is characterized in that, when carrying out the normalized of channel estimating, when targeted customer's current physical coded combination transfers information takies a plurality of code channel, and when having the activated code channel of surpassing to exist in these code channels, then need at first the channel power of this physical coded combination transfers information is averaged, carry out the normalized of channel estimating again, specifically comprise following steps:

Step 3.1, the power of all activated code channel of current physical coded combination transfers information is averaged;

Step 3.2, the channel estimating of the pairing activated code channel of current physical coded combination transfers information is carried out normalized.

4. the method for normalizing of estimating at the public distributing mode lower channel as claimed in claim 3 is characterized in that, in the described step 3.1, the method that the power of all activated code channel of current physical coded combination transfers information is averaged is:

$\stackrel{\‾}{P}=\frac{\underset{j}{\overset{Y}{\mathrm{\Σ}}}{P}_{\mathrm{kj}}}{Y};$

Wherein, Y represents all activated code channel set of current physical coded combination transfers information.

5. the method for normalizing of estimating at the public distributing mode lower channel as claimed in claim 3 is characterized in that in the described step 3.2, the method for the channel estimating of the pairing activated code channel of current physical coded combination transfers information being carried out normalized is:

Wherein, set U represents all activated code channel complete or collected works of current physical coded combination transfers information;

N represents n code channel;

K represents k channel estimating point in the whole channel estimation window;

The channel estimation value of k channel estimating point in the whole channel estimation window of h (k) expression;

The code channel average power of representing n code channel;

α represents the adjustment factor of the amplitude information of channel estimation value, prevents that channel estimation value is excessive or too small.

6. a normalization device of estimating at the public distributing mode lower channel is used for TDS-CDMA system; It is characterized in that, comprising:

Calculate the power model of each channel code, calculate the power P of each channel code of current physical coded combination transfers information _k, and obtain the power information tabulation PowerList={P of each code channel _K1P _K2... P _Kn;

Each channel code is activated the module of detection, obtain the activation situation of this targeted customer's current physical coded combination transfers information and other users' channel code;

The normalization module of the channel estimating of each channel code is carried out the normalized of channel estimating to the pairing channel of code channel of each activation of current physical coded combination transfers information

Wherein, set U represents all activated code channel complete or collected works of current physical coded combination transfers information;

N represents n code channel;

K represents k channel estimating point in the whole channel estimation window;

The channel estimation value of k channel estimating point in the whole channel estimation window of h (k) expression;

Pn represents the code channel power of n code channel;

α represents the adjustment factor of the amplitude information of channel estimation value, prevents that channel estimation value is excessive or too small.

7. a kind of normalization device of estimating at the public distributing mode lower channel as claimed in claim 6 is characterized in that the power P of calculating channel sign indicating number _kMethod be:

$P_k=\underset{n=1}{\overset{N_{\mathrm{cd}}}{\mathrm{\Σ}}}{\left|\right|{\hat{d}}_n^{(2,k)}\left|\right|}^2;$

Wherein,

N symbol representing k code channel;

N _CdBe the characteristic symbol calculating number of setting in advance that active coding detects that carries out, the data number of power calculation is carried out in expression.

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