基于连续相位频移键控调制的物理层网络编码检测及性能分析
doi: 10.3724/SP.J.1146.2013.01201
Physical-layer Network Coding Based on CPFSK Modulation Detection and Performance Analysis
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摘要: 针对双向中继信道，该文提出一种基于连续相位频移键控(CPFSK)调制的物理层网络编码(PNC)机制，即CPFSK-PNC。与已有的采用BPSK, QPSK等调制方式的物理层网络编码相比，该机制引入CPFSK的技术优势，提高了系统的频谱效率和功率效率。该文对瑞利衰落信道中CPFSK-PNC的物理层网络编码检测进行了研究。首先，利用CPFSK信号的记忆特性，根据最大似然准则设计了中继节点的物理层网络编码检测方案；其次，分析了信号之间最小欧氏距离并给出中继检测的平均误比特率下边界；最后，仿真验证了理论分析结果。Abstract: A Physical-layer Network Coding (PNC) scheme based on Continuous Phase Frequency Shift Keying (CPFSK) modulation, i.e., CPFSK-PNC, for two-way relay channels is proposed. Compared with the current schemes of BPSK or QPSK for PNC, the CPFSK-PNC scheme, by exploitating the technical advantage of the CPFSK method, has higher power and spectral efficiency. The detection for the relay receiver in the CPFSK-PNC scheme over Rayleigh fading channels is investigated. Firstly, in the light of the memory property of the CPFSK signal, the detection method for PNC at the relay based on the Maximum-Likelihood (ML) criterion is designed. Secondly, the minimum Euclidean distance is analyzed and the tight lower bound for the average bit error rate at the relay is derived. And finally, the simulation results verify the theoretical asymptotic derivations.
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