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Low complexity linear iteraction multiple users detecting device and method

A technology of multi-user detection and linear iteration, which is applied in the field of linear iterative multi-user detection devices and multi-user detection devices in direct sequence code division multiple access systems, can solve the difficulty of solving the inverse of the correlation matrix R and the difficulty of computational complexity Acceptance, Difficulty, etc.

Inactive Publication Date: 2007-01-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA ZHONGSHAN INST
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AI Technical Summary

Problems solved by technology

On the one hand, in the changing mobile environment, it is not easy to solve the inverse of the correlation matrix R
Especially in CDMA systems, in order to better reduce interference, voice activation and variable rate coding techniques are generally used, which makes the correlation between user signals change at any time, so the inverse of R is also time-varying, which makes real-time Solving the inverse of R becomes very difficult
On the other hand, the fastest algorithm for inverting a matrix has a multiplication operation of K 3 order, when the number of users K is large, its computational complexity is unacceptable

Method used

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  • Low complexity linear iteraction multiple users detecting device and method
  • Low complexity linear iteraction multiple users detecting device and method
  • Low complexity linear iteraction multiple users detecting device and method

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Embodiment Construction

[0070] The technical solution of the present invention will be further described through specific implementation below.

[0071] Using Matlab simulation software to simulate, the simulation system is a synchronous / asynchronous DS-CDMA system, AWGN channel, BPSK modulation, carrier phase is 0, and a pseudo-random sequence with a length of 10 is used to spread spectrum. The analysis is carried out from three aspects of bit error rate, anti-"near and far" effect and computational complexity. Assume that user 1 is the expected user and the number of users is 10.

[0072] Step 1: At the receiving end, a vector of 10 matched filter bank outputs is available:

[0073] y=RBb+N

[0074] Among them, R=S·S H , the size of the correlation matrix R is 10×10, which represents the correlation value between two codewords.

[0075] Step 2: For the MMSE multi-user detector, select the adaptive adjustment factor α, the measured noise power σ 2 and signal amplit...

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Abstract

This invention provides a linear iterative multi-user test device of low complexity and a method, which avoids computation of matrix inversion by a series of circulated iteration, since the method reduces the round-off error in the computation, the computation accuracy is increased greatly at the same time when reducing computation volume and reduces noises resulted from MAI to resume multi-user information very well.

Description

Technical field: [0001] The present invention relates to a low-complexity linear iterative multi-user detection device and method, belonging to the field of digital communication using electromagnetic wave technology, and in particular to a device and method for multi-user detection in a Direct Sequence Code Division Multiple Access (DS-CDMA) system, These devices and methods can eliminate the multiple access interference (MAI) existing in the DS-CDMA system in real time. Background technique: [0002] In a CDMA communication system, the main factors restricting system performance include co-channel interference and intersymbol interference. Inter-symbol interference restricts the communication rate of the system, which is mainly suppressed by equalization or diversity technology; it is mainly caused by multiple access interference (MAI) such as mobile stations in the same cell, same-frequency base stations or mobile stations in adjacent cells, and other communication system...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04B1/7103
Inventor 罗仁泽
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA ZHONGSHAN INST
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