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Estimating method of reach direction of user signal wave of array antenna MC-CDMA system

A technology of MC-CDMA and array antenna, applied in the field of multi-carrier code division multiple access cellular mobile communication system, can solve the problems that array antenna cannot be directly applied, array antenna cannot be effectively estimated, etc.

Inactive Publication Date: 2009-07-08
BEIJING JIAOTONG UNIV
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Problems solved by technology

Traditional DOA estimation algorithms such as Multiple Signal Classification (MUSIC) and Estimation of Signal Parameters by Rotation Invariant Technique (ESPRIT) require that the number of array antenna elements is more than the number of signal sources, and the signal sources cannot overlap in space, otherwise the array The antenna cannot effectively estimate the DOA of the signal source
However, there are usually dozens of users in a cell in a mobile communication system, so the traditional DOA estimation algorithm cannot be directly applied to the array antenna MC-CDMA system

Method used

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  • Estimating method of reach direction of user signal wave of array antenna MC-CDMA system
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Embodiment Construction

[0062] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0063] According to the method of the present invention, it can be applied to any MC-CDMA mobile communication system using array antennas.

[0064] figure 1 The process of applying this method to the array antenna MC-CDMA system to estimate the direction of arrival of any user k signal is given.

[0065] The specific estimation steps are as follows:

[0066] 1) First, the baseband signal x(t)=[x 1 (t), K, x N (t)] T Send to the despreading and matched filter bank module 11 of each subcarrier, realize the user in the Separate the signals on each subcarrier to obtain the array antenna matched filter output vector y of the user k'th l subcarrier signal k，l (i),

[0067] y k , l ( i ) = [ ...

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Abstract

A method for estimating the direction of arrival of a user signal in an array antenna MC-CDMA system includes the following steps: first, using the subcarrier despreading and matched filter banks connected after each array element of the array antenna to realize the separation of the user signal on each subcarrier , to obtain the output vector of the array antenna matched filter of the user subcarrier signal; secondly, carry out frequency-domain summation on the output of the matched filter of each subcarrier signal, and obtain the output vector sum of the array antenna matched filter of all subcarrier signals; then, Based on the sampling of the vector sum, the sampling estimate of the covariance matrix corresponding to the output vector of the array antenna is obtained; after that, the eigendecomposition of the covariance matrix is ​​performed to obtain the estimation of the main eigenvector of the covariance matrix; finally, based on the corresponding main eigenvector Spatial spectral function, by searching the spectral peak of the spatial spectral function to obtain the estimation of the direction of arrival of the user signal. It effectively solves the problem of estimating the direction of arrival of user signals in array antenna MC-CDMA system.

Description

technical field [0001] The invention belongs to the field of multi-carrier (MC) code division multiple access (CDMA) cellular mobile communication system. Background technique [0002] CDMA is the most important technology in the third generation (3G) mobile communication system, and multi-carrier (MC) modulation will be the key technology of the third generation (B3G) mobile communication system. Combining multi-carrier technology with CDMA technology to form a multi-carrier CDMA system will be an important direction for the development of the future mobile communication technology system. There are three main forms of multi-carrier fusion CDMA schemes: multi-carrier CDMA (MC-CDMA), multi-carrier direct-sequence spread spectrum CDMA (MC-DS-CDMA) and multi-tone modulation CDMA (MT-CDMA). Among them, MC-CDMA is considered to be the most promising scheme among the three schemes because it can adopt frequency domain diversity and excellent performance, and it is also one of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/08H04B7/12H04J13/02H01Q21/00
Inventor 杨维张德珍
Owner BEIJING JIAOTONG UNIV
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