论文标题
广义空间MPPM系统的不对称双模式星座和原色LDPC代码设计
Asymmetric Dual-Mode Constellation and Protograph LDPC Code Design for Generalized Spatial MPPM Systems
论文作者
论文摘要
为了在自由空间光学（FSO）通信中实现可靠，有效的传输，本文设计了一种新的Protograph低密度均衡检查（PLDPC）编码的广义空间多电体位置调制（GSMPPM）系统，方法是在弱的湍流通道上。具体而言，我们研究了PLDPC代码，广义空间移动键合（GSSK）调制和MPPM星座。首先，我们提出了一种新型的GSMPPM星座，该星座将GSSK智能地集成到MPPM中，称为非对称双模式（ADM）星座，以提高PLDPC编码的GSMPPM系统的性能。此外，利用Protograph外部信息传输（PEXIT）算法，我们构建了一种改进的PLDPC代码，称为I-PLDPC代码，该代码的表现优于弱湍流通道的现有PLDPC代码。分析和仿真结果表明，拟议的ADM星座以及提出的I-PLDPC代码可以在其对应物上获得明显的性能提高。因此，拟议的具有ADM星座的PLDPC编码的GSMPPM系统具有满足FSO应用的高可靠性要求。
To achieve reliable and efficient transmissions in free-space optical (FSO) communication, this paper designs a new protograph low-density parity-check (PLDPC) coded generalized spatial multipulse position modulation (GSMPPM) system over weak turbulence channels. Specifically, we investigate the PLDPC code, generalized space shift keying (GSSK) modulation, and MPPM constellation. First, we propose a type of novel GSMPPM constellations that intelligently integrates the GSSK into MPPM, referred to as asymmetric dual-mode (ADM) constellations, so as to improve the performance of the PLDPC-coded GSMPPM system. Furthermore, exploiting a protograph extrinsic information transfer (PEXIT) algorithm, we construct a type of improved PLDPC code, referred to as I-PLDPC code, which outperforms the existing PLDPC codes over weak turbulence channels. Analytical and simulation results show that the proposed ADM constellations and the proposed I-PLDPC code can obtain noticeable performance gains over their counterparts. Therefore, the proposed PLDPC-coded GSMPPM system with ADM constellations is competent to satisfy the high-reliability requirement for FSO applications.
