摘要
差分正交移相键控(DQPSK)是现代宽带无限数字通信的常用调制方式,其中的四进制差分编译码电路是设计的关键。本文通过对DQPSK数字调制解调系统中四进制差分编码器的功能分析,导出其逻辑表达式和真值表,从而设计出四进制差分编码器的逻辑电路图,再用Multisim虚拟电子电路仿真软件验证所设计的电路的功能,结果表明完全符合DQPSK的差分编解码要求。
Differential quadrature phase-shift keying （DQPSK） is a commonly used modulation method in modem wireless wideband digital communication systems, in which, the 4-order differential code and decode circuit are key units of the design. On the way of function analysis of 4-order differential code-decode circuits in DQPSK digital modulation-demoduation system, this paper deduces their logic expressions and truth table,and designs out their logic circuits, Then the circuit＇s functions have been tested by using Multisim,electronic circuit simulation software,and simulation results show that the designs are meet the requirements of differential code-decode in DQPDK.
出处
《电子测量技术》
2008年第4期57-59,85,共4页
Electronic Measurement Technology
