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.

CN1901388AInactive Publication Date: 2007-01-24UNIV OF ELECTRONICS SCI & TECH OF CHINA ZHONGSHAN INST
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Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2007-01-24
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

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...