基于TMS320C6x实现多载波QPSK信号全数字化整体解调

The Implementation of Fully Digitized Demodulation for Multicarrier QPSK Signals as a whole with TMS320C6x

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，现己用该算法进行了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；目前己用最新数字信号处理器ＴＭ３２０Ｃ６２０１硬件板对此方法的关键技术进行了实时仿真。

A new method of fully digitized demodulation for 2M-FDMA/QPSK (SCPC/QPSK) group signals as a whole is presented and proved in this paper According to the features of channel forming and the signal modulation mode. a simplified equivalent ployphase-FFT demultiplexing method is given by combining the direct demutiplexing with conventional ployphase-FFT. demultiplexer The output digital signals of the demufliplexer are directly sent to the digitized demodulator so that the fully digitized integral multi-carrier demodulator is realized. This system is characterized by the simple software and hardware structure, little computation and easy real-time realization with DSP. The computer simulation experiment of integral demodulation with the algorithm given in the paper for 32-channel FDMA/QPSK signal has been finished. The results show that the method is feasible. Presently, the real-time simulation on the key techniques with the newest DSP TMS320C6201 hardware board has been largely completed.