Article Published In Vol.1 (Sept-Oct-2013)

Performance Analysis of OFDM System with PSK Modulation over Rayleigh Fading Channel

Author : Madhvi Jangalwa

Orthogonal Frequency Division Multiplexing (OFDM) is a special form of multicarrier transmission technique. OFDM mitigates Inter Symbol Interference (ISI) caused by delay spread of wireless channel. Also it offers high data rate, high Spectral Efficiency (SE), and immunity against Narrow Band Interference (NBI). Therefore it has been adopted in many wireless standards such as worldwide interoperability for microwave access (WiMAX) and Long Term Evolution (LTE). Spectral Efficiency (SE) is one of the major issues in wireless communication system. In wireless communication system SE depends on modulation technique. This study investigates the SE and Bit Error Rate (BER) performance of OFDM system over Rayleigh fading channel for different Phase Shift Keying (PSK) modulation techniques. Simulation results show that minimum SE obtained with the Binary Phase Shift Keying (BPSK) modulation technique at lower SNR. The comparative study of BER over different modulation techniques show that minimum BER can be achieved with the BPSK modulation technique.

Keywords: Orthogonal Frequency Division Multiplexing (OFDM), Inter Symbol Interference (ISI), Spectral Efficiency (SE), Narrow Band Interference (NBI), WiMAX, Long Term Evolution (LTE), Bit Error Rate (BER), Rayleigh fading channel , Phase Shift Keying (PSK), Binary Phase Shift Keying (BPSK)