摘要
阐述了可变相移键控（ＶＰＳＫ）和甚小频移键控（ＶＭＳＫ）基带数字调制技术编解码原理，给出了双相码基带信号频谱的一般数学表达式和计算机仿真得出的频谱图．对ＶＰＳＫ 和ＶＭＳＫ 信号的频谱利用率作出初步估计，并提出了基于ＦＰＧＡ 的编解码器实现方案．
There are two schemes using biphase coded modulation combinated with SSB SC radio frequency transmitting techniques, called variable phase shift keying (VPSK) and Very Minimum Shift Keying (VMSK), can achieve spectral efficiencies as high as 15 kb·(s·Hz) -1 or more. These techniques can be applied to transmit high speed data through analog radio channels. This paper described the principle of this kind of biphase coded modulation in some details, and presented a mathematical expression of the spectrum of these baseband signals and showed some frequency spectrum obtained from computer simulation. The analytial results help us to understand the essense of VPSK and VMSK techniques. Circuit design of the coder/decoder is a good reference for real applications.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2000年第2期250-253,共4页
Journal of Shanghai Jiaotong University
关键词
双相编码调制
无线数字传输
频带利用率
VPSK
biphase coded modulation
wireless digital transmission
spectral efficiency
single side band suppress carrier(SSB SC)
