无线电通信技术2011，Vol.37Issue(5)：9-12,4.
π/4-DQPSK信号的多普勒频移快捕和跟踪
Rapid Acquisition and Tracking of Doppler Frequency Shift for π/4-DQPSK Signals
摘要
Abstract
This paper presents a new algorithm of rapid acquisition and tracking of Doppler frequency shift for π/4-DQPSK signals, which is suitable for digital satellite mobile burst communication system. The Doppler frequency shift acquisition is performed by modulated signals of unique word and the decision feedback PLL is employed to track Doppler frequency shift. The simulation results show that the performance of demodulator is independent of rolloff-factor a, and the simulation results also indicate that Doppler frequency shift range from - Rs/2 - Rs/2 has no effect on bit error rate Pb.关键词
数字卫星移动突发通信系统/π/4-DQPSK/多普勒频移/独特码/判决反馈PLL环Key words
digital satellite mobile burst communication system/π/4-DQPSK/Doppler frequency shift/unique word/decision feedback PLL分类
信息技术与安全科学引用本文复制引用
吴团锋,徐友云,归琳,马文峰..π/4-DQPSK信号的多普勒频移快捕和跟踪[J].无线电通信技术,2011,37(5):9-12,4.基金项目
国家自然科学基金（60625103）和上海市数字媒体处理与传输重点实验室资助项目 （）
