摘要
分析采用最小移频键控 ( MSK)调制的直接序列扩展多址系统 ( MSK/ DS/ SS-MA)的性能 .分析表明 ,MSK/ DS/ SSMA系统的扩频信号比常规的 QPSK/ DS/ SSMA信号具有更低的功率谱旁瓣电平 ,适合在移动通信、卫星信道中应用 .还讨论了该系统的诸如抗干扰、多址能力方面的性能 ,并给出了一种采用简化的接收机结构的 MSK/ DS/
A direct-sequence spread-spectrum system in MSK format( MSK-CD- MA) is analysed.It has advantage over one in BPSK( BPSK-CDMA) or QPSK( QPSK- CDMA) formatbecause of the modulated signal in MSK formatkeeping domination of the lower sidelobes level than in others.Based on random address sequences,its performance, such as tolerance to jamming,capability to multiple users,is given.The result shows that this system has a little better performance than others.In addition,if a little degradation of performance is permitted,its receiver can be simplified.
基金
山东省教委资助项目
关键词
扩频通信
调制
DS/SSMA系统
最小移频键控
Spread spectrum communication
Frequency shift keying
Code divi- sion multiple access
