摘要
提出并证明了一种群路FDMA/QPSK(频分多址/正交相移键控)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(快速傅里叶变换)分离法相结合,构成了一种简化的等效多相FFT分路方法,再将输出的数字信号送到数字式解调器,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。
A new method of fully digitized demodulation for 2M-FDMA/QPSKgroup 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 demultiplexer are sent to the digitized demodulator so that the fully digitized integral multi-cartier 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.
出处
《电子工程师》
2005年第8期24-26,31,共4页
Electronic Engineer
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, DSP
