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首页> 外文期刊>IEE Proceedings. Part I, Communications >Performance of iterative multiuser receivers for turbo-coded asynchronous DS-CDMA systems over flat-fading channels
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Performance of iterative multiuser receivers for turbo-coded asynchronous DS-CDMA systems over flat-fading channels

机译：平坦衰落信道上Turbo编码异步DS-CDMA系统的迭代多用户接收机的性能

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摘要

The performance of iterative multiuser receivers in a turbo-coded asynchronous direct-sequence code-division multiple-access system over a fully interleaved Rayleigh flat-fading channel is presented. The full-complexity soft-in/soft-out (SISO) multiuser detector based on the logarithmic maximum a posteriori probability (log-MAP) algorithm has a computational complexity growing exponentially with the number of users. It is shown that the computational complexity can be significantly reduced by replacing the MAP multiuser detector in the receiver with suboptimal SISO detectors. A novel hybrid reduced-state algorithm that effectively combines the advantages of the T-algorithm and the channel memory reduction algorithm is proposed. The computational complexity of the proposed detector is determined by the reduced channel memory length and can be further reduced adaptively based on channel conditions. Simulation results show that a substantial reduction in complexity can be obtained at the expense of slight degradation in performance compared with the full-complexity MAP detector. The proposed algorithm is compared with other reduced-complexity schemes and the superiority of the proposed algorithm in terms of performance/complexity tradeoffs is demonstrated.
机译：提出了在完全交织的瑞利平坦衰落信道上，Turbo编码的异步直接序列码分多址系统中的迭代多用户接收机的性能。基于对数最大后验概率（log-MAP）算法的全复杂度软输入/软输出（SISO）多用户检测器的计算复杂度随用户数量呈指数增长。结果表明，通过用次优SISO检测器代替接收器中的MAP多用户检测器，可以显着降低计算复杂度。提出了一种新型的混合降阶算法，该算法有效地结合了T算法和信道记忆约简算法的优点。所提出的检测器的计算复杂度由减小的信道存储器长度确定，并且可以基于信道条件来自适应地进一步减小。仿真结果表明，与全复杂度MAP检测器相比，可以以降低性能的代价为代价大大降低复杂度。将提出的算法与其他降低复杂度的方案进行比较，并证明了该算法在性能/复杂度折衷方面的优越性。

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