海事卫星BGAN载波恢复技术研究  

Carrier Recovery in Inmarsat BGAN

作　　者：朱永川[1] 饶志宏[1] 

机构地区：[1]中国电子科技集团公司第三十研究所,四川成都610041

出　　处：《通信技术》2012年第1期1-3,共3页Communications Technology

摘　　要：载波恢复是实现信号相干解调的一个必不可少的部分。通过研究海事卫星全球宽带网(BGAN)信号帧中的独特字(UW),采用数据辅助的频偏估计和面向判决的相偏估计算法,完成了对实际接收海事卫星BGAN信号的载波恢复,该方法捕获时间快,估计范围大,准确度高。结果表明该算法对BGAN信号的频偏、相偏均能正确收敛,恢复后星座图接近16QAM星座图,为信号解调提供保证。Carrier recovery is an essential part for achieving the coherent demodulation. Based on the estimation algorithm of the data-aided frequency offset and decision-directed phase shift, the simulation is done by using the Unique Word in the frame and the carrier recovery of the real BGAN signal is realized. The method is speedy in acquisition, large in estimation range and high in accuracy. The experiment result indicates that this algorithm could fairly implement the frequency offset and phase shift for BGANsignal. The constellation figure is closely to 16QAM, thus providing an assurance for signal demodulation.

关 键 词：海事卫星 全球宽带网 载波恢复 

分 类 号：TN911.7[电子电信—通信与信息系统]