Abstract: In order to reduce the Peak to Average Power Ratio（PAPR） of Orthogonal Frequency Division Multiplexing（OFDM） system and develop the resource of Power Line Communication（PLC） efectively，this paper proposes a new Partial Transmit Seqence（PTS） technique.The technique presents Microcanonical Annealing（MA） algorithm to optimize phase factor.Simulation result shows that the algorithm can get the excellent phase factor with fast convergence speed，and the PAPR of the OFDM system is reduced remarkably which improves the performance of PLC effectively.

Key words: Orthogonal Frequency Division Multiplexing（OFDM）, Peak to Average Power Ratio（PAPR）, Partial Transmit Seqence（PTS）, microcanonical annealing, Power Line Communication（PLC）

摘要： 为有效降低OFDM系统峰均功率比，以最大效率开发利用电力线通信资源，提出一种新的降低峰均比的部分传输序列技术，采用微正则退火算法优化相位因子。仿真结果表明，该算法以较快的收敛速度取得较优的相位因子序列，显著降低了正交频分复用系统的峰均比，提高了电力线通信系统的性能。

关键词: 正交频分复用, 峰均比, 部分传输序列, 微正则退火, 电力线通信