基于最大似然估计和DSP技术的相位补偿算法  

Phase Compensation Algorithm Based on Maximum Likelihood Estimation and DSP Technology

作　　者：铁维昊[1] 王文利 路灿[1] 

机构地区：[1]西安交通大学电气工程学院,西安710049 [2]郑州电力公司,郑州450000

出　　处：《高压电器》2012年第10期42-46,共5页High Voltage Apparatus

摘　　要：针对低压电力线非线性信道特性及不同步因素对于载波信号相位的影响,笔者提出了一种基于最大似然估计的相位补偿算法。首先分析了同步问题对于误码率的影响。其次,介绍了相位补偿算法的原理及关键技术的分析。最后在DSP中实现了相位补偿算法的程序设计,并在实际的低压信道中进行测试。测试结果表明:该算法可以有效地解决数字通信中信道的非线性引起的信号失真问题。To investigate the influence of nonlinearity and asynchronization of low-voltage power line channel on phase of carrier signal,a phase compensation algorithm based on maximum likelihood estimation is proposed. First the influence of synchronization on BER is analyzed, then the principle of the phase compensation algorithm and key technology are introduced. Finally, program of the phase compensation algorithm is implemented in DSP, and is tested in actual low-voltage channel. The result shows that the proposed algorithm can eliminate signal distortion caused by nonlinearity of channel in digital communication.

关 键 词：最大似然估计 相位补偿算法 DSP处理器 同步 电力线载波通信 

分 类 号：TM726.2[电气工程—电力系统及自动化]