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本文提出了一种基于部分并行干扰消除(PPIC)结构的迭代多用户检测算法,并对基于PPIC的迭代多用户检测器的迭代结构进行了改进。由于PPIC多用户检测器前一级输出的信息的准确度会影响到后一级的检测,所以为了提高基于PPIC的迭代多用户检测器的性能,对PPIC每一级的输出信息结合最大后验概率(MAP)信道译码器单独进行迭代处理,这样就提高了PPIC每一级输出的信息的准确性。该迭代结构可用于其他基于PIC型的迭代多用户检测算法。
This paper presents an iterative multiuser detection algorithm based on partially parallel interference cancellation (PPIC) architecture, and improves the iterative structure of iterative multiuser detector based on PPIC. In order to improve the performance of PPIC-based iterative multi-user detector, the output of each level of PPIC combined with the maximum a posteriori test, because the accuracy of the information output by the former level of PPIC multi-user detector will affect the latter level of detection. The probability (MAP) channel decoder is iteratively processed alone, thus improving the accuracy of the information output by each level of PPIC. This iterative structure can be used with other iterative multi-user detection algorithms based on the PIC type.