基于分层调制的物理层网络编码研究  

Physical-layer Network Coding Based on Hierarchical Modulation

作　　者：唐猛[1] 陈建华[1] 张艳[1,2] 张榆锋[1] 

机构地区：[1]云南大学信息学院,昆明650091 [2]云南大学软件学院,昆明650091

出　　处：《电子与信息学报》2016年第10期2568-2574,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61062005;61561049)~~

摘　　要：在实际的移动通信环境中,信道的状态复杂多变,该文针对双向中继信道的非对称性,提出采用分层调制方式的物理层网络编码方案。首先构建源节点、中继节点均采用分层(2/4-PSK)调制的双向中继通信系统模型;其次给出了中继节点的物理层网络编码解调及映射规则,推导出加性高斯白噪声下中继误比特率及端到端误比特率理论计算公式;最后仿真验证了理论分析结果。与采用传统QPSK调制技术的物理层网络编码相比,该方案利用分层调制的技术优势,确保较优信道的高速率传输,也兼顾了较差信道的传输可靠性。In wireless communication network, the channel state information is complicated. A joint Hierarchical Modulation and Physical-layer Network Coding （HM-PNC） scheme is proposed for the asymmetric Two-Way Relay Channel （TWRC）. In this scheme, the two source nodes and the relay node adopt the hierarchical modulation technology （2/4-PSK）. In the relay node, a special demodulation/modulation and PNC mapping rule is designed. Corrupted by Additive White Gaussian Noise （AWGN）, the relay Bit Error Ratio （BER） and the end-to-end BER expressions are derived. Simulation results show that the HM-PNC scheme not only improves the data rate in better links, but also takes into account the transmission reliability of the poor channels. Compared with the traditional QPSK-PNC scheme, the HM-PNC scheme has better mobile performance.

关 键 词：物理层网络编码 分层调制 双向中继信道 非对称信道 

分 类 号：TN925[电子电信—通信与信息系统]