摘要
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.
出处
《信号处理》
CSCD
1999年第B12期26-30,共5页
Journal of Signal Processing
基金
九五国防预研项目资助
关键词
多载波解调
数字分路
数字解调
数字信号处理
Multi-Carrier Demodulating (MCD), Digitized Demultiplexing, Digitized Demodulation, Digital Signal Processing (DSP)