Performance Analysis of BPSK-OFDM and DQPSK-OFDM Schemes for Wireless Communication System

Abstract

The mobile communication system is
interfered with multipath fading. At transmitter end,
the signals are received from different angle and time.
This result in, delay in the signal of reflections from
the different obstructions. In order to solve this
problem, Orthogonal Frequency Division
Multiplexing (OFDM) is introduced. In this paper,
OFDM technology is used that gives the best Bit
Error Rate (BER) performance in a multipath fading
environment using computer simulation. The system
implements using two different phase modulations
which are, Differential Quadrature Phase Shift
Keying (DQPSK) and Binary Phase Shift Keying
(BPSK). Subsequently, ideal and worst cases of the
communication channel models are also
demonstrated. The system is designed using
MATLAB coding for BPSK-OFDM and DQPSKOFDM are written under various physical path
conditions such as; Additive White Gaussian Noise
(AWGN) and Rayleigh multipath fading channel. It is
defined that using proposed technique, the Eb/No=6,
the BER is 0.00259x10-2 is achieved for under
AWGN. The Eb/No=6 is 0.05302x10-1 is attained for
Rayleigh, Eb/No=6dB is 0.00259x10-2recorded while
for fultipath Rayleigh. The result shows that the BER
performance for BPSK-OFDM is better than DQPSKOFDM.