跟瞄误差对星间光码分多址系统性能的影响

Influence of tracking and pointing error on the performance of inter-satellite optical CDMA communication system

为了研究星间光CDMA(codedivisionmultipleaccess)通信系统的性能,分析了跟瞄误差对系统误码率性能的影响。考虑多用户干扰、跟瞄误差和接收机噪声,给出了该通信系统的系统模型,并数值分析了跟瞄误差为不同值时误码率随接收光功率的变化关系。结果表明,跟瞄误差较小时可以实现高码速率通信,当跟瞄误差较大时,该通信系统难以实现通信,需要采用信道编码和新的接收技术来提高通信系统的性能。

In order to study the performance of inter-satellite optical CDMA communication system, the influence of tracking and pointing error on the BER of this communication system was analyzed. With considering the effects of multi-user interference, tracking, pointing error, and APD noise, the system model of inter-satellite optical CDMA communication system was presented. The relationship between BER and receiving optical power was analyzed in detail. The results show that the inter-satellite optical CDMA communication system can realize high-speed communication when the normal variance σ of tracking and pointing error is small. When σ is large, a new detection scheme and channel coding should be used to improve communication performance.