大气光通信系统中Turbo码的性能研究

STUDY ON PERFORMANCE OF TURBO CODE IN ATMOSPHERIC OPTICAL COMMUNICATION SYSTEM

针对Turbo码在大气光通信系统中的性能,研究并建立了基于Matlab中Simulink通信模块的Turbo码仿真模型。针对大气光通信信道的特点,通过对光强分布的分析,得出弱湍流情况下,大气信道可看成AWGN信道。在信噪比相同的情况下,结合Turbo码对通信系统进行数值模拟,得到交织长度、迭代次数、译码算法、码率等对Turbo码性能影响显著。设计实际通信系统时,应对以上因素进行综合考虑。

In light of the performance of Turbo code in atmospheric optical communication system, we study and set up the Turbo code simulation model which is based on Simulink communication module in Matlab. According to the characteristics of atmospheric optical communication channel, and by the analysis on light intensity distribution, we find that the atmospheric channel can be considered as AWGN channel when it is in weak turbulence. In condition of same RSN, we conduct numerical simulation of communication system integrated with Turbo code, and conclude that the interleaving size, iteration times, decoding algorithm and code ratio, etc. are all noticeably affect the performance of Turbo code. When designing the practical communication system, the above factors shall be considered comprehensively.