编码协作技术可提高电力线远距离通信的性能.为了满足非对称电力线双向中继系统的要求,针对中继脉冲噪声,提出了一种基于中继概率密度函数的估计转发和门限近似的物理层网络编码算法.首先分析了中继信号的概率密度分布,推导了中继编码信号的均值和方差公式;接着分析了不同信道参数下中继概率密度函数的平层特性,利用门限法对多维信号进行了简化近似.最后针对提出的算法进行了算法仿真,仿真结果验证了所提算法的有效性和可靠性;并存在最优化的功率分配因子.%The development of coded cooperation technology motivates the improvement of power line communi -cation (PLC).In order to satisfy the two-way relay system with asymmetric power line , a physical layer network coding ( PLNC) algorithm is provided , which is based on estimate and forward and threshold approximation of relay probability density function ( PDF) .Firstly, the probability density distribution of relay signal is analyzed , and the mean and variance of coded signal are derived as a result .Furthermore , the ping layer character of relay PDF with different channel parameters was analyzed , and threshold method is introduced to approximatively simplify multi-di-mensional signal .Last but not least , through extensive simulations , it show that the proposed algorithm can achieve considerable effectiveness and reliability , and there exist the optimal power allocation factor .
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