Design of Higher Order Modulation Schemes for Orthogonal Frequency Division Multiplexing (OFDM) Systems

Abstract

In this paper we design and simulate OFDM (Orthogonal Frequency Division Multiplexing) to study the performance of the OFDM system at higher order modulation schemes. It is very important to evaluate performance of the communication system, to test the efficiency and quality of the service it can provide. We use Matlab program to design the functionality of OFDM, then BER(Bit Error Rate) is obtained to different SNR(Signal to Noise Ratio) values, for M-array PSK and M-array QAM modulations techniques. BER is widely used as performance measurement tool, it tells number of bits destroyed while the data is travelling from source to the destination, AWGN(Additive White Gaussian Noise) is used as transmission channel.Index Terms-OFDM, Bit error rate, QAM, noise, AWGN.