单相配电网多用户OFDM通信系统的频谱优化

Spectrum Optimization of Multi-user OFDM Communication System Over Single-phase Power Distribution Network

电力线通信应用OFDM作为调制解调方式,在典型的低压电力线信道上进行多用户通信时,存在信道频谱的优化问题。本文讨论了单相配电网的多用户OFDM通信系统环境下,子信道和功率的分配问题,对原有的一种快速次优算法进行了改进,在算法中整体考虑未能满足速率要求的所有用户,同时在改变初始分配结果时更为有效的分配发射功率。仿真结果表明,在极少增加算法运行时间的情况下,改进后的算法比原算法在发射功率相同的情况下系统的整体传输速率有了较大的提高。证明改进后得算法可以更高的效率解决该系统中的频谱优化问题。

OFDM is commonly used in power-line communication. For the multi-user communication over a typical power distribution network, an important problem is the spectrum optimization. The spectrum optimization problem over a typical multi-user power-line OFDM communication system is discussed. Based on the principle of solving the problem more holistically and delicately, an improved algorithm of the original rapid optimization algorithm is given. Through the simulation under typical power-line channel environment, the result indicates that the improved algorithm can get higher transmission rate using the same transmit power with a little increment of running time. It is convinced that the improved algorithm has a enhanced efficiency on solving this problem.