Title :
Using a forced nonlinear oscillator to implement a QPSK modulator without a 90 degree phase shifter
Author :
Chen, Juin-Hung ; Tsao, Hen-Wai
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
fDate :
2/5/1998 12:00:00 AM
Abstract :
A new quadriphase-shift keying (QPSK) modulator is presented. It comprises two nonlinear oscillators, one RC differentiator and two voltage control current sources (VCCSs); it is named the `direct QPSK modulator´. Experimental results are also reported. Such a modulator is suitable for generating direct sequence spread spectrum signal in a wireless communication system, and can be packaged into an IC
Keywords :
modulators; oscillators; quadrature phase shift keying; IC package; RC differentiator; direct QPSK modulator; direct sequence spread spectrum signal; forced nonlinear oscillator; quadriphase shift keying; voltage control current source; wireless communication;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19980138
