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

作　　者：黄文准[1] 王文艺[2] 周德锁[2] 

机构地区：[1]西北工业大学,陕西省西安市710072 [2]空军工程大学电讯工程学院,陕西省西安市710077

出　　处：《电子工程师》2005年第8期24-26,31,共4页Electronic Engineer

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.

关 键 词：多载波解调 数字分路 数字解调 数字信号处理 

分 类 号：TN914.3[电子电信—通信与信息系统]