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物理层网络编码作为一种新型中继处理技术,因其具有提高系统吞吐量、提升带宽利用率等优势而受到广泛关注。目前,对物理层网络编码双向中继系统误码性能的研究主要集中于两源节点采用相同调制方式,BPSK-QPSK非对称调制方式下的系统误码性能尚未可知。文章研究了BPSK-QPSK调制物理层网络编码双向中继系统的BER性能,推导了多址接人阶段的BER精确表达式,进一步提出了可使中继处的BER最小的功率分配策略。文中的分析方法可拓展到其他调制方案。仿真和数值表明:文中的理论分析与仿真结果完全吻合,得到的BER公式可有效地评估系统误码性能,所提功率分配策略可明显改善系统误码性能。
As a new type of relay processing technology, physical layer network coding has drawn much attention due to its advantages of improving system throughput and improving bandwidth utilization. At present, the research on the bit error performance of the physical layer network coding bidirectional relay system mainly focuses on that the two source nodes adopt the same modulation mode, and the systematic error performance under the BPSK-QPSK asymmetric modulation mode is unknown. In this paper, the BER performance of BPSK-QPSK modulation physical layer network coding bidirectional relay system is studied. The BER precise expression of multi-access phase is deduced. A power allocation strategy is also proposed to minimize the BER at the relay. The analysis method in this paper can be extended to other modulation schemes. The simulation and numerical results show that the theoretical analysis and simulation results are in good agreement. The BER formula obtained can effectively evaluate the system error performance. The proposed power allocation strategy can significantly improve the system error performance.