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，现已用该算法进行了 ３２路ＦＤＷＡ／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．
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.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2000年第1期15-17,共3页
Acta Electronica Sinica
基金
国家自然科学基金!(No.69872027)
九五国防预研项目
关键词
数字解调
数字信号处理
QPSK信号
调解算法
mullet-carrier demodulating (MCD)
digitized demultiplexing
digitized demodulation
digital signal processing (DSP)
