可见光通信系统中的码间干扰抑制方法研究

Inter-code interference suppression in laser communication system

在激光通信系统的传输信道容易受到多径作用产生码间干扰,导致通信的误比特率较大,为了改善激光通信质量,提出一种基于频带抽样判决调制和多径扩展的激光通信码间干扰抑制方法。首先构造激光通信信道模型,分析通信系统带宽与频率、距离的关系,选择合适的载波频率及带宽,进行通信信道的时延扩展。然后采用频带抽样判决调制方法进行信道均衡设计,根据多径扩展的统计平均限定码元的速率,实现码间干扰抑制。最后进行了实际的激光通信仿真试验分析,结果表明,采用该方法进行通信系统的码间干扰抑制,降低了输出码元的误比特率,激光探测信号的多径分量能准确到达接收阵元,实现无误码通信传输。

In the transmission channel of the laser communication system, the multipath effect is easy to generate inter-code interference, resulting in a large bit error rate of communication. In order to improve the quality of laser communication, a inter-code interference inhibition methodof laser communication based on band sampling decision modulation and multipath expansion is proposed. Firstly, the laser communication channel model is constructed, and the relationship between the bandwidth of the communication system and the frequency and distance is analyzed. The appropriate carrier frequency and bandwidth are selected to reduce the delay of the communication channel. Then, the frequency band sampling decision modulation method is adopted to perform channel equalization design, and the inter -code interference suppression is implemented according to the statistical average rate of the multipath expansion. Fi nally ,the actual laser communication simulation test analysis is carried out. The results show that the method is used to suppress the inter-code interference of the communication system, and the bit error rate of the output code is re duced. The multipath component of the laser detection signal can accurately reach the receiving array element and real ize error-free communication transmission.