摘要
提出了一种带有瞬时位相调制技术的高性能差分型码分多址系统 .该系统中的瞬时位相调制技术是当前最新通信技术之一 ,描述了π/4 -DQPSK瞬时位相调制的基本原理并画出了瞬时位相解调级框图 .系统中应用了连续位相的Walsh码作为扩谱码 ,Walsh码的产生方法有较大创新 .这两项最新技术的应用 ,提高了系统性能 。
The high quality differential coding CDMA ( diffCDMA ) system with instantaneous phase that is new technology in communication field has been devised. The principle of modulation with π/4 DQPSK instantaneous phase and the illustration of demodulation has been devised. The new Walsh code taken as spread spectrum code has been adopted. The application of the two items of important technology to the differential coding CDMA (diffCDMA) system improves the capacity and eliminates the fatal transmission error when communications are carried out from high speed running mobiles through such urban environment as rapid multi ray Rayleihg channel. This two items of technology inuoeve not only mathematical problems of communication theory but also electronic circuit problems in diffCDMA system.
出处
《南京师范大学学报（工程技术版）》
CAS
2002年第1期32-37,共6页
Journal of Nanjing Normal University(Engineering and Technology Edition)
基金
江苏省科委和教育厅基金资助 (2 0 0 1WLXSB9B411和 2 0 0 1WLXTSHBH12 )
关键词
瞬时位相
扩谱
Walsh码发生器
希尔伯特变换
instantaneous phase, spread spectrum, generator of walsh code, hilbert tranoformation
