Abstract: The objective of paper is to develop and compare a model of an OFDM system using different values of cyclic prefixes in Matrix laboratory language (MATLAB) on which BER calculations is carried out for various digital modulation schemes like BPSK, 16 QAM, and 64 QAM. The OFDM signal was transmitted over the AWGN channel for various signal to noise ratio (SNR) values. To evaluate the performance, for each SNR level, the received signal was demodulated and the received data was compared to the original information. The convolution coding and interleaving is applied to improve BER performance of OFDM system.
Keywords: OFDM, Convolution coding, Cyclic Prefix, Additive White Gaussian Noise, Bit error rate.