Improving the Bit Error Rate of OFDM using Convolutional codes

Abstract

In wireless applications high throughput and better transmission quality can be achieved by parallel transmission of data, one of such technique is Orthogonal Frequency Division Multiplexing (OFDM) by adding channel coding to the uncoded OFDM ,the performance can be improved. In this paper, the system throughput of a working OFDM system has been enhanced by adding convolution coding. Convolution codes are used extensively in numerous applications in order to achieve reliable data transfer, including digital audio and video, mobile, radio communication, satellite deep space network communication. They can correct even burst and random errors. Simulation is done over Additive white Gaussian Noise (AWGN) channel has 64- sub carriers each is individually modulated by 16-QAM (Quadrature Amplitude Modulation). The performance parameter used for evaluation of BER(Bit Error Rate) with AWGN channel.