基于DSP的FQPSK/CEFQPSK调制器实现

DSP implementation of FQPSK/CEFQPSK modulator

摘要:

首先介绍了适用于深空通信的费赫尔正交移相键控(FQPSK)调制技术。为了改善其包络起伏特性，又介绍了一种严格的恒包络调制技术——恒包络正交移相键控(CEFQPSK)，它不但保持了FQPSK较高的带宽效率、无干扰和抖动的优点，而且实现了严格的恒包络，能够将发射机射频功率放大器效率发挥到最大。最后采用了一系列简化运算的处理方法，在TI公司的DSP中实现了这2种调制，达到信号高速输出的目的。

Abstract:

Feher patented Quadrature Phase Shift Keying(FQPSK)，which is suitable for deep space communication，is introduced at first. In order to improve its envelope fluctuation，a modified FQPSK modulation—Constant Envelope FQPSK(CEFQPSK) that has an absolutely constant envelope is presented. This modulation method not only keeps the high bandwidth efficiency, Interference and Jitter Free(IJF) features of FQPSK，but also improves the power efficiency of the radio frequency amplifiers to the utmost. In order to generate signal at high speed and real-time，several optimized technologies are adopted and these two modulation technologies are implemented by using DSP of TI.