摘要
本文实现了一个M进制正交码扩频系统，它能传输2．4Kbps和16Kbps两种信息速率数据，并能在低信噪比条件下解扩译码．文中首先讨论了该系统数据的编码扩频和解扩译码的方案，其次讨论了码片采用MSK调制时，本地载频和抽样时钟的初始相位的估计方法，然后提出了在解扩泽码的同时进行相位跟踪的Q支路相关同步法，最后测试了系统的误比特性能．
An M-ary Orthognal Coded Spread Spectrum(OCSS) system with 2.4Kbps and 16Kbps data rate is realized. The ereieved signal can be despreaded under low SNR. Firstly, the methods for spreading and despreading are discussed. Secondly, formulations for estimating the carrier and the sampling timing initial phase offset of MSK spread spectrum signal are derived. Thirdly, Q-channel correlation method for phase tracing is proposed. Finally, the bit error rate is measured.
出处
《电子学报》
EI
CAS
CSCD
北大核心
1998年第1期105-110,共6页
Acta Electronica Sinica
关键词
正交码扩频
解扩
同步跟踪
扩频通信
Orthogonal coded spread spectrum,Despreading,Phase tracting
