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基于多种调制方式的空时OFDM系统多用户检测技术
齐萌,陆彦辉,穆晓敏
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(郑州大学信息工程学院,郑州 450001)

摘要:

建立了基于空时分组码的多输入多输出(MIMO)-正交频分复用(OFDM)系统模型，研究了基于最小均方误差的串行干扰消除（MMSE-SIC）多用户检测算法，通过优化排序迭代结构，使得接收算法具有较好的性能。仿真结果表明，该算法在误码率方面能够取得优于常规线性MMSE算法的性能，而且得出星座图中映射点间距也影响着检测算法的性能，随着间距的缩小，误码概率会上升。

关键词: 空时编码 MIMO-OFDM 串行干扰消除多用户检测

DOI：

基金项目:国家自然科学基金资助项目（60702020）

Multiuser Detection Algorithm for Space time Coded OFDM Systems Based on a Variety of Modulation

QI Meng,LU Yan-hui,MU Xiao-min

(School of Information Engineering，Zhengzhou University，Zhengzhou 450001,China)

Abstract:

In this paper, a multiple input multiple output orthgonal frequency di vesion multiplex(MIMOOFDM) model based on spacetime coding is constructed a nd a successive interference cancellation(SIC) multiuser detection(MUD) algori thm is presented based on minimum mean square error(MMSE) algorithm. Optimizing the sorting structure enables the receiver algorithm to have better performance.The simulation results show that this method can obtain significantl y improved bit error rate(BER) over the conventional MMSE MUD algorithm ,and the performance of the detection algorithm is influenced by the mapping point spacing in the constellation, with the spacing reduced the BER will rise.

Key words: space-time coding MIMO OFDM SIC multiuser detection(MUD)