Study of QPSK Modulator and Demodulator in Wireless Communication System Using MATLAB

Sharief Abdel-Razeq ,Areej Salah Al-Azzeh,Rawan Yousef Ayyoub

doi:10.3991/ijim.v7i2.2239

Abstract

Quadrature Phase-Shift Keying (QPSK) modulation technique is one of the most widely used modulation scheme in modern digital communication system; it provides high performance on bandwidth efficiency. In this paper, the model of QPSK modulator and demodulator has been simulated using MATLAB Simulink.

Highlights

Communications systems can be defined as transferring data from one place to another; it is done in wired or wireless manners
Quadrature Phase Shift Keying (QPSK) is one of the most popular digital modulation techniques used for satellite communications and sending data over cable networks, videoconferencing, cellular phone systems, and other forms of digital communication over Radio Frequency (RF) carrier [3]
It could be noted that the phases generated when 11, 01, 10, and 00 were sent are π/4, 3π/4, 7π/4, and 5π/4, respectively. These results match the theoretical studies of QPSK

Summary

Introduction

Communications systems can be defined as transferring data from one place to another; it is done in wired or wireless manners. In either ways; we have to modulate the baseband signal to make it suitable for transmission over the medium This process called Modulation which could be Analog or Digital Modulation. Digital modulation is a process that impresses a digital symbol onto a signal suitable for transmission over a wired or wireless medium in order to receive that signal at receiving end correctly without any loss of information [2]. Numerical methods themselves are usually iterative in nature requiring several intermediate steps in order to arrive at a solution. This means much time may be months or years, will be needed and more energy expended in an effort to solve a particular problem. Such problems can readily be solved in a few hours by the use of commercial engineering software packages, such as MATLAB/SIMULINK®, ANSOFT®, SIMPLORER®, WORKBENCH®, etc. [5]

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