摘要
讨论了跟踪及数字中继卫星系统 (TDRSS)一种新的扩频调制方案 ,即并行MSK扩频 .根据不同的TDRSS业务在I路和Q路根据数据率的高低选择扩频或不扩频 .给出了QPSK扩频调制和并行MSK扩频调制的信号表达式和实现模型 ,并建立了MAT LAB仿真模型 .理论分析和仿真结果都证实并行MSK扩频调制的频谱特性优于QPSK扩频调制 .
A novel spread spectrum scheme of Tracking and Data Relay Satellite System, i.e.the parallel MSK spread spectrum modulation is discussed in this paper. According to various TDRSS services, spread spectrum modulation is used or not. The signal equations and the implementation models of QPSK spread spectrum and parallel MSK spread spectrum modulation are presented. It is testified that the spectrum efficiency and the rolling drop characteristic of parallel MSK spread spectrum modulation is superior to QPSK spread spectrum modulation by the emulation results.
出处
《深圳大学学报（理工版）》
EI
CAS
2002年第1期35-39,共5页
Journal of Shenzhen University(Science and Engineering)
