Superposition modulation with reliability-based hybrid detection
Superposition modulation with reliability-based hybrid detection
复制标题
具有基于可靠性的混合检测的叠加调制
DOI：
10.1109/istc.2010.5613858
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
P. Hoeher
中科院分区：
文献类型：
--
作者：
D. Hao;P. Hoeher
本文研究了一种先进的调制方案——叠加调制（SM）及其在比特交织编码调制（BICM）中的应用。利用外部信息传递（EXIT）图技术研究了最大后验检测器（MAP）和高斯近似概率数据关联检测器（PDA-GA）。结果表明，在高信噪比下，由于高斯近似的不准确性，导致了PDA-GA检测器的性能损失。此外，提出了一种基于可靠性的混合检测器，该检测器通过对更可靠的干扰符号应用高斯逼近来逼近剩余干扰的概率密度函数（pdf），同时计算不可靠干扰符号的精确pdf。通过采用高斯近似调整干扰符号的数量，该混合方案提供了一种灵活的解决方案，可以在性能和复杂性之间折衷。
In this paper, an advanced modulation scheme called superposition modulation (SM) and its applications in bit-interleaved coded modulation (BICM) is studied. The maximum a posteriori (MAP) detector and the probabilistic data association detector with Gaussian approximation (PDA-GA) are investigated using the extrinsic information transfer (EXIT) chart technique. It is demonstrated that the performance loss of the PDA-GA detector is due to an inaccuracy of the Gaussian approximation at high SNRs. Additionally, a reliability-based hybrid detector is proposed, which approximates the probability density function (pdf) of residual interference by applying the Gaussian approximation on more reliable interfering symbols, while calculating the exact pdfs of unreliable interfering symbols. By adjusting the number of interfering symbols employing the Gaussian approximation, this hybrid scheme provides a flexible solution to compromise between performance and complexity.