期刊名称：International Journal of Electronics Communication and Computer Engineering
印刷版ISSN：2249-071X
电子版ISSN：2278-4209
出版年度：2013
卷号：4
期号：3
页码：774-777
出版社：IJECCE
摘要：This paper is the study of the QPSK (Quadrature Phase shift keying) modulation technique using AWGN (Additive white Gaussian noise) and Multipath Rayleigh fading channel. In QPSK scheme we can transmit one of the 4 possible signals during each interval of signalling. WCDMA systems are based on higher modulations which provide transmission at higher data rates. In this we studied the scatter plot, eye diagram and signal trajectory of QPSK system over different communication channels. All modulation techniques have different performance characteristics over various signals which are affected by noise and interference
