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Modulation-mode assignment for SVD-assisted and iteratively detected downlink multiuser MIMO transmission schemes

机译:SVD辅助和迭代检测的下行链路多用户MIMO传输方案的调制模式分配

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摘要

In this contribution we jointly optimize the number of multiple-input multiple-output (MIMO) layers and the number of bits per symbol within an iteratively-detected multiuser MIMO downlink (DL) transmission scheme under the constraint of a given fixed data throughput and integrity. Instead of treating all the users jointly as in zero-forcing (ZF) multiuser transmission techniques, the investigated singular value decomposition (SVD) assisted DL multiuser MIMO system takes the individual user's channel characteristics into account. In analogy to bit-interleaved coded irregular modulation, we introduce a MIMO-BICM scheme, where different user-specific signal constellations and mapping arrangement were used within a single codeword. Extrinsic information transfer (EXIT) charts are used for analyzing and optimizing the convergence behaviour of the iterative demapping and decoding. Our results show that in order to achieve the best bit-error rate, not necessarily all user-specific MIMO layers have to be activated
机译:在此贡献中,我们在给定的固定数据吞吐量和完整性的约束下,共同优化了迭代检测的多用户MIMO下行链路(DL)传输方案内的多输入多输出(MIMO)层数和每个符号的比特数。代替零强迫(ZF)多用户传输技术中的所有用户,研究的奇异值分解(SVD)辅助的DL多用户MIMO系统考虑了单个用户的信道特性。类似于比特交织的编码不规则调制,我们引入了MIMO-BICM方案,其中在单个码字内使用了不同的用户特定信号星座图和映射布置。外部信息传输(EXIT)图用于分析和优化迭代解映射和解码的收敛行为。我们的结果表明,为了获得最佳的误码率,不一定必须激活所有用户特定的MIMO层

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