卫星移动通信系统短突发结构信道估计方案

Channel estimation scheme for short burst structures of mobile satellite communication system

为改善卫星移动通信系统的短突发帧结构的信道估计性能,分析卫星移动通信链路结构,综合考虑卫星移动通信信道估计方法,提出了一种基于软判决反馈的信道估计方案。通过对基于训练序列信道估计的判决结果进行反编码,利用统计判决结果剔除偏差值较大项,进行信道软判决估计,其软硬件实现复杂度和处理延迟在可接受的范围内。仿真结果表明,该方案使卫星移动通信系统解调性能在低、高速莱斯信道下得到较大提高。

To improve the channel estimation performance of the short burst frame structure of the satellite mobile communica- tion system, the mobile satellite communication link structure was analyzed and the mobile satellite communication channel esti mation method was comprehensively considered. A channel estimation scheme based on soft decision feedback was proposed. Through the decision outcome of the code based on the training sequence channel estimation, the reverse coding was done. Re- sults of statistical decision were used to reject big deviation, and soft decision estimation for channel was done. The hardware and software implementation complexity and the processing delay were in an acceptable range. The results of simulation show that the scheme demodulation performance of the mobile satellite communication system in the low-speed and high-speed Rice channel greatly increases.