FQPSK-KF的调制特性与信道性能分析

FQPSK-KF Modulation Characteristic and Analysis of its Performance in Channels

研究了FQPSK-KF的调制特性,理论推导了其包络特性,仿真计算了其功率谱密度(PSD),并与一些常见调制方式进行了比较;然后在卫星数传信道的基础上,通过建立不同的信道模型,对这一调制方式的调制性能进行分析比较,结果表明这一调制方式具有一定的应用前景。

The modulation characteristic of Feher and Kato＇s patented Quadrature Phase Shift Keying （ FQPSK - KF） is studied, including theoretic analysis of its envelope trait and computation of its power spectral density（PSD）. On the basis of statellite data transmission channel, various models are established to simulate the band - limited and non - linear channels. Analysis and comparison of the modulation shows that compared with QPSK and IJF - OQPSK modems in the band - limited and non - linear channels, it has costant envelope, less spectral spreading, better BER performance and less interference of adjacent channels, etc. So, it is more suitable for the statellite data transmission channel.