用TMS320C6x实现2M路QPSK信号全数字化整体解调算法研究

本文提出并证明了一种群路FDMA/QPSK(SCPS/QPSK)信号全数字化整体解调的新方法,该方法根据信道构成特点和信号调制方式,将直接分路法和常规多相FFT分离法相结合,构成了一种简化的等效多相FFT分路方法,接着将输出的数字信号直接送到数字式解调器,实现了多载波信号的全数字化整体解调,其特点是软件和硬件结构简单、系统计算量小,且易于DSP实时实现,现已用该算法进行了32路FDMA/QPSK信号整体解调的计算机仿真实验,结果表明该方法是可行的;目前已用最新数字信号处理器TMS320C6201硬件板对此方法的关键技术进行了实时仿真.

Study on the Algorithm of Fully Digitized Demodulation for 2M-QPSK Signals as a Whole with TMS320C6x

In this paper,a full-digitized demodulation method for 2~M channel FDMA/QPSK (SCPC/QPSK) signals is Presented. With the characteristics of channel forming and modulation mode, a simplified equivalent Ployphase-FFT demultiplexer is formed by combining the direct and the conventional ployphase-FFT demultiplexing method. Furthermore, the Outputs of the demultiplexer are directly fed to a digitized demodulator so that a full-digitized integral multi-carrier demodulator is realized. This system is characterized by its simplicity in software and hardware structure,low cast computationally and convenience in real-time DSP realization. Computer simulation experiment of an integral demodulator for a 32-channel FDMA/QPSK signal suggests that the method is feasible,where some key techniques have been implemented in real-time with a TMS320C6201 DSP emulator.