瞄准误差对多脉冲位置调制星间激光通信系统误符号率的影响

Symbol Error Rate Performance Analysis of Multi-Pulse Position Modulation Inter-Satellite Optical Communication with Pointing Errors

分析了多脉冲位置调制星间激光通信系统的性能,在散粒噪声极限下,给出了平均误符号率(ASER)的解析表达式;在热噪声极限下,给出了ASER的紧密上边界的解析表达式,并验证了理论计算的正确性。数值仿真结果表明,随着抖动方差的增大,系统性能迅速下降;当发射功率的取值范围不同时,不同束腰半径下系统性能存在差异;当单个符号中的脉冲数不变时,增大符号中的时隙数可提高系统性能,但带宽利用率也会降低。故在系统参数的选取中,需要综合考虑以上因素。

The performance of multi-pulse position modulation inter-satellite optical communication system is analyzed.For the shot-limited system,the analytical expression of the average symbol error rate(ASER)is given.For the thermal-limited system,the analytical expression of tight upper bound on the ASER is derived.The validity of theoretical calculations is verified.The results of numerical simulations show that the system performance degrades with the increase of jitter variance,and for the different power regions,the performance of the system varies with the different beam waist radiuses.When the number of signal slots per symbol is constant,increasing the number of time slots per symbol will increase the system performance,but the bandwidth utilization reduces as well.Therefore,when selecting system parameters,the above factors need to be considered comprehensively.