涡轮编码MC-CDMA系统的低复杂度迭代多用户接收机

Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367) Pub Date : 2002-08-07 DOI:10.1109/VTC.2002.1002913

P. Kafle, A. Sesay

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引用次数: 1

摘要

在turbo编码的MC-CDMA系统中，提出了一种基于分组最大似然序列估计(MLSE)和改进干扰消除方案的低复杂度迭代多用户接收机。它基于在第一次迭代时根据活跃用户的信号强度对其进行分组，并通过MLSE计算每组用户之间的对数似然比。在后续的迭代中，采用了一种改进的干扰消除方案，该方案可以从解码中获得的代码外部信息中获益，从而降低了复杂度。给出了一种典型数据传输方案在瑞利多径衰落环境下的仿真结果。采用最大后验(MAP)准则和软干扰消除技术与迭代接收机进行了比较。该方案在几次迭代内实现了与基于MAP的迭代接收机非常接近的性能，并且计算成本大大降低。这种方法在近距离条件下也表现得非常好。

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A low-complexity iterative multiuser receiver for turbo-coded MC-CDMA system

A low-complexity iterative multiuser receiver is proposed using groupwise maximum likelihood sequence estimation (MLSE) combined with a modified interference cancellation scheme in a turbo coded MC-CDMA system. It is based on grouping the active users according to their signal strengths and computing the log-likelihood ratios by MLSE among each group of users at the first iteration. For subsequent iterations, a modified interference cancellation scheme that can benefit from code extrinsic information available through decoding is used, for lower complexity. Simulation results are presented in a Rayleigh multipath fading environment for a typical data transmission scheme. Comparisons are made with iterative receivers using the maximum a posteriori (MAP) criterion and soft interference cancellation. Performance very close to that of a MAP based iterative receiver is achieved by this novel scheme within a few iterations, with much lower computational cost. This approach also performs significantly well under near-far conditions.

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来源期刊

Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367)

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