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首页> 外文期刊>IEEE Transactions on Communications >BER-Optimal Linear Parallel Interference Cancellation for Multicarrier DS-CDMA in Rayleigh Fading
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BER-Optimal Linear Parallel Interference Cancellation for Multicarrier DS-CDMA in Rayleigh Fading

机译:瑞利衰落中多载波DS-CDMA的BER最优线性并行干扰消除

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摘要

In this paper, we consider the design and bit-error performance analysis of linear parallel interference cancellers (LPIC) for multicarrier (MC) direct-sequence code division multiple access (DS-CDMA) systems. We propose an LPIC scheme where we estimate and cancel the multiple access interference (MAI) based on the soft decision outputs on individual subcarriers, and the interference cancelled outputs on different subcarriers are combined to form the final decision statistic. We scale the MAI estimate on individual subcarriers by a weight before cancellation. In order to choose these weights optimally, we derive exact closed-form expressions for the bit-error rate (BER) at the output of different stages of the LPIC, which we minimize to obtain the optimum weights for the different stages. In addition, using an alternate approach involving the characteristic function of the decision variable, we derive BER expressions for the weighted LPIC scheme, matched filter (MF) detector, decorrelating detector, and minimum mean square error (MMSE) detector for the considered multicarrier DS-CDMA system. We show that the proposed BER-optimized weighted LPIC scheme performs better than the MF detector and the conventional LPIC scheme (where the weights are taken to be unity), and close to the decorrelating and MMSE detectors.
机译:在本文中,我们考虑了用于多载波(MC)直接序列码分多址(DS-CDMA)系统的线性并行干扰消除器(LPIC)的设计和误码性能分析。我们提出了一种LPIC方案,其中我们根据各个子载波上的软判决输出来估计和消除多址干扰(MAI),然后将不同子载波上被干扰消除的输出进行组合以形成最终决策统计量。在取消之前,我们通过权重来缩放各个子载波的MAI估计值。为了最佳地选择这些权重,我们导出了LPIC不同阶段输出时的误码率(BER)的精确封闭式表达式,我们将其最小化以获得不同阶段的最佳权重。此外,使用涉及决策变量特征函数的替代方法,我们得出了考虑的多载波DS的加权LPIC方案,匹配滤波器(MF)检测器,去相关检测器和最小均方误差(MMSE)检测器的BER表达式。 -CDMA系统。我们表明,所提出的BER优化加权LPIC方案比MF检测器和传统LPIC方案(权重被认为是统一的)表现更好,并且接近去相关和MMSE检测器。

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