Abstract: In the last decade, Orthogonal Frequency Division Multiplexing (OFDM) based communication systems have been identified as one of the key transmission techniques for next generation wireless communication systems. The main objective is to transmit the OFDM signal with low bit error rate in the noisy environment. A cyclic prefix acts as a buffer region where delayed information from the previous symbols can get stored. Different modulation technique with respect to bit-error rate and SNR ratio is analyzed using MATLAB software. Here the performance of OFDM signal is analyzed by comparing the BER results of coding technique such as convolution [1]. As well various modulation methods are also used. Two decoding methods are used to analyze the signal. One is soft decoding and other is hard decoding with convolution code. Three types of modulation methods are used with normal OFDM to analyze the system performances which are Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), and Quadrature Amplitude Modulation (QAM)[2]. The goal of this paper is to improve system performance by the mean of low bit error rate. Finally bit error rate of these three methods are analyzed by comparing SNR versus BER plots. Soft decoding method in convolution with high code rate gives better BER performance.
Keywords: OFDM, Convolution Code, Error detection, Error correction code, cyclic prefix, SNR, QPSK, BPSK, QAM, and BER.
Title: BER IMPROVEMENT IN OFDM USING CODING TECHNIQUES
Author: Mrs. Shubhangi S. Joshi, Mrs. A. P. Laturkar
International Journal of Electrical and Electronics Research
ISSN 2348-6988 (online)
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