周期时变信道特性的宽带电力线比特功率分配算法

Bit-loading and power allocation algorithm for LPTV channel for BPLC systems

从宽带电力线的线性周期时变(LPTV)性出发,提出了一种适应于宽带电力线的比特与功率分配算法。算法分为两个步骤,第一步通过拉格朗日乘子法对每个子信道进行比特预分配,第二步通过二分查找法的思想进行快速迭代。仿真结果表明:与传统算法相比,该算法在保证传输速率的同时能明显降低算法运算量,能克服宽带电力信道的时变特性,提高系统性能,是一种可用于实际通信的算法。

Considering the broadband linear periodic time varying（ LPTV） channel,propose a bit-loading and power allocation algorithm adapt to broadband power line. The algorithm can be divided into two steps,the first step uses Lagrange multiplier method to allocate bit and power,the second step uses binary search method for rapid iteration. The simulation results show that compared with the traditional algorithm,this algorithm can guarantee transmission rate and also significantly reduce computational quantity. The algorithm can overcome the broadband power channel time-varying characteristics,improve the system performance,and can be used in actual power line communication.