卫星通信中调制解调性能的研究

Research on the performance of modulation and demodulation in satellite communication system

卫星通信系统中常用的调制方式主要是PSK及其改进方式,解调采用相干解调。针对复杂多变的卫星信道环境,在对π/4-BPSK、π/4-QPSK原理分析的基础上,引入一种新的调制方式π/4-CQPSK,并对这些调制方式进行比较分析。在解调时采用差分解调而不是传统的相干解调。最后,在特有的卫星信道条件下,仿真分析了上述调制解调方式性能。

The modulation methods commonly used in satellite communications systems are PSK and its improved versions. Accord-ing to the complex and variable satellite communication environment, the paper compares the π / 4- CQPSK, π / 4- BPSK, and π / 4-QPSK modulation methods after describing their principles. Using differential demodulation but not coherent demodulation, the perfor-mance of π / 4- CQPSK, π / 4- BPSK, and π / 4- QPSK modulations is simulated and compared on Lutz satellite channel condition.