Layered encoding for 16- and 64-QAM iterative MIMO receivers
Layered encoding for 16- and 64-QAM iterative MIMO receivers
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适用于 16-QAM 和 64-QAM 迭代 MIMO 接收器的分层编码
DOI：
10.1049/cp:20030307
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
B. Mulgrew
中科院分区：
文献类型：
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作者：
H. Claussen;H. Karimi;B. Mulgrew
在之前的工作中，作者证明，对于使用4-QAM的MIMO链路，涉及连续干扰消除（SIC）检测器和卷积解码器之间迭代的接收器能够优于基于后验概率（APP）检测器和涡轮解码器的接收器。这是在显着降低复杂性和不需要矩阵通道均衡实现。然而，对于高阶调制方案，如16- qam和64-QAM，迭代接收器无法适当收敛，而基于app的接收器表现良好，但代价是高昂的计算复杂度。提出了一种新颖的分层编码方案，使迭代接收机能够在高阶调制下工作。在这里，在检测器和涡轮解码器之间执行迭代。此外，对迭代接收机结构固有的软输出组合进行了优化，使每次迭代时的相互信息传递最大化。结果表明，与分层编码方案相结合，迭代接收器在较低的计算复杂度下再次优于基于app的接收器。
In a previous work the authors demonstrated that, for MIMO links using 4-QAM, receivers which involve iterations between a successive interference cancellation (SIC) detector and a convolutional decoder are able to outperform receivers based on the a posteriori probability (APP) detector and a turbo decoder. This is achieved at significantly lower complexity and without the need for matrix channel equalization. However for higher-order modulation schemes such as 16- and 64-QAM, the iterative receiver is unable to converge appropriately, while the APP-based receiver performs adequately but at the expense of prohibitive computational complexity. A novel layered encoding scheme is proposed at the transmitter which allows the iterative receiver to operate with higher-order modulations. Here, iterations are performed between the detector and a turbo-decoder. In addition, soft output combining, inherent to the iterative receiver architecture, is optimized so as to maximize the mutual information transfer at each iteration. It is shown that, in conjunction with the layered encoding scheme, the iterative receiver again outperforms the APP-based receiver, at a lower computational complexity.