星地激光通信链路中的极化码性能研究

Performance investigation of Polar Code for satellite-ground laser communication link

摘要:

在星地激光通信链路中，激光在大气信道中传输时容易受湍流作用，导致信号功率衰落。考虑到极化码在短码下的优良性能和较低的实现复杂度，将其应用于星地激光通信系统中来对抗大气湍流引起的信号衰落。基于对湍流信道的分析，搭建了星地激光通信系统仿真平台，并在其中引入了极化码。实验结果表明在中等湍流和强湍流下，极化码分别降低了13%和25%的通信中断概率，极大地改善了星地激光通信系统的性能。

Abstract:

In satellite-ground laser communication link, the laser is easily affected by turbulence effect when transmitting in the atmosphere channel, resulting in signal power fading. Considering the excellent performance and low implementation complexity of Polar Code in short code, it is utilized to satellite-ground laser communication system to combat signal fading induced by atmospheric turbulence. Based on the analysis of turbulence channel, a Polar Code aided simulation platform of satellite-ground laser communication system is established, in which Polar Code is introduced. The results show that under moderate turbulence and strong turbulence, Polar Code reduces the probability of communication interruption by 13% and 25% respectively, which greatly improves the performance of satellite-ground laser communication system.