一种基于检测信息可靠度的部分软干扰消除迭代多用户检测算法
An Iterative Multiuser Detection Algorithm Using Partial Soft Interfenrence Cancellation Based on Detection Reliability
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摘要: 该文提出了一种基于检测信息可靠度的部分软干扰消除迭代多用户检测算法。如果由从信道译码器所获得的发送字符的先验信息大于某一预定阈值，则认为对其检测具有较高的可靠度，因而可以考虑将其对应的多址干扰成分从匹配滤波器输出向量中直接消除，相当于减小了干扰用户的数目，从而可以减小迭代多用户检测算法的复杂度。该算法的计算复杂度能够随着多址干扰的减小和信道信噪比的增大而降低。Abstract: In this paper, an iterative multiuser detection algorithm using partial soft interfenrence cancellation based on detection reliability is proposed. If the a priori information of the transmitted symbols provided by the channel decoder in the previous iteration is larger than a predefined threshold , the detection of these symbols are thought to be reliable and the corresponding MAI (Multiuser Access Interfenrence) can be eliminated from the outputs of the matched filters. This is equal to decrease the number of the interference users, thus the complexity of the iterative multiuser detection algorithm is decreased. Furthermore, when the MAI is moderate and the SNR is high, the computational complexity of this algorithm can be reduced adaptively.
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