摘要
为了研究OQPSK调制体制是否适合卫星通信,对OQPSK调制和相干解调基本原理和性能特点进行了分析。文章结合工程实践,重点分析了OQPSK相干解调的关键技术,包括载波同步、多普勒频偏计算、定时同步以及相位解模糊,同时分析了OQPSK在卫星通信中的优点。经过理论分析和实践得出,OQPSK调制信号恒包络且频谱效率较高,适合宽带卫星通信数据传输。设计了一种符号速率为120Msps的宽带OQPSK调制解调器,并且测试了调制性能和解调性能的关键参数,经过工程应用表明了上述结论的正确性。
For the researehon whether OQPSK modulation is suitable for satellite communication, basic theory and performance of OQPSK modulation and coherent demodulation are analyzed. In combination of project experience, key techniques of OQPSK coherent demodulation, including carrier synchronization, Doppler frequency calculation, timing synchronization and phase anti-illegibility, are discussed in detail, and inaddition, the superiority and advantage of OQPSK in satellite communication also treated. Theory analysis and practice indicate that OQPSK is suitable for satellite communication data transmitting for its invariable signal envelope and high spectrum efficiency. A wideband OQPSK MODEM with a symbol rate of 120Msps is designed, and its key performance parameter of modulation and demodulation tested. And the project practice proves the correctness of above conclusion.
出处
《通信技术》
2016年第3期356-360,共5页
Communications Technology
关键词
OQPSK
相干解调
宽带
卫星通信
OQPSK
coherent demodulation
wideband
satellite communication
