基于PLC信道相关性的分集合并技术研究

Research on diversity and combining techniques based on correlation of power line channel

研究电力线信道(power line channel,PLC)相关性对提高电力线通信系统的性能具有重要意义。基于电力线信道的多输入多输出(multiple input muliple output,MIMO)模型和信道本身的物理特性,可知电力线载波通信系统中信道间存在一定的相关性。详细分析了电力线信道单输入多输出(single input multiple output,SIMO)系统中子信道之间相关性及计算方式,同时也分析了电力线单输入多输出系统在分集合并技术下,采用二进制相移键控(binary phase shift keying,BPSK)调制方式时的最大比合并和等增益合并的系统误码率,比较了2种分集合并技术在不同的信道相关性下的误码率。通过仿真得出,相关性会影响分集合并的误码率,进而影响系统的性能。

Study on the power line channel（ PLC） correlation is of great significance to improve the performance of power line communication system. For the power line MIMO（ multiple input multiple output） channel model and its inherent physical characteristics,correlation between the different sub-channels in the PLC system is inevitable. A detailed analysis of correlation between the sub-channels in PLC-SIMO（ power line channel-single input multiple output） system was developed and the theoretical arithmetic of the correlation was given in this paper,then analysis of the BER performance of PLC-SIMO channel with un-coded transmission with BPSK modulation and MRC / EGC at the receiver is given,then BER performance of the combining techniques under different coefficient are compared. Finally,the simulation results show that in case of a full correlation between the diversity channels,diversity gain with combining techniques is not achievable. then affects the system performance.