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在车载通信系统中,全双工中继技术可满足车联网的低时延需求以及缓解频谱资源短缺问题。然而,实际车载通信应用中不同信源车辆发送的信息相互独立,节点调制方式往往不对称。这种非对称传输会加剧全双工模式残余自干扰造成的译码错误。论文针对这一问题,提出一种非对称调制的全双工通信方法,该方法引入网络编码DF-JM解决了非对称调制带来的误码率增大的问题。此外,分析了全双工残余自干扰随功率动态变化情况下的优化约束条件,得到最优功率分配区间。数值分析结果证明:在不同功率区间内,论文所提方法都可找到最优功率比例,使得系统误比特性能最优。
In vehicle communication systems, full-duplex relay technology can meet the low latency requirements of car networking and alleviate the problem of spectrum resource shortage. However, the information transmitted by different source vehicles in the actual vehicular communication applications is independent of each other, and the node modulation is often asymmetrical. This asymmetric transmission exacerbates the decoding error caused by full-duplex mode residual self-interference. In order to solve this problem, this paper proposes a full-duplex asymmetric modulation communication method. This method introduces the network coding DF-JM to solve the problem of increasing bit error rate caused by asymmetric modulation. In addition, the optimal constraints of full-duplex residual self-interference with power dynamics are analyzed and the optimal power allocation interval is obtained. Numerical analysis results show that: in different power intervals, the proposed method can find the optimal power ratio, making the system optimal error performance.