摘要
针对电力线通信中多普勒频移为零以及具有一定拓扑结构的电力线信道中由多径反射所产生的时延扩展较移动信道而言相对稳定的特点,这里在最大似然(ML)类算法的基础上,实现了基于电力线信道的改进的正交频分复用技术(OFDM)同步算法。该方法有效的弥补了ML类算法不适合具有多径效应的电力线信道的不足。理论分析和仿真结果表明,该算法在电力线信道中具有良好的定时估计和频率偏移估计性能,而且计算量减少。
Aiming at that the Doppler frequency shift is zero in the power line communication and the delay generated by the multipath reflection is more stable in the power line channel with certain topological structure than in the mobile channel,a modified blind OFDM synchronization algorithm based on maximum likelihood-type（ML） algorithms and suitable for powerline communication is proposed,which could effectively overcome the limitations that ML-type algorithms are not fit for the power line channel.Theoretical analysis and computer simulation results show that this method,with less computation,performs well in estimation of the timing and the frequency offset in the power line channel.
出处
《通信技术》
2011年第3期24-26,95,共4页
Communications Technology
基金
教育部新世纪优秀人才支持计划项目(NO.NCET-05-0897)
