Comparison of BER for Various Digital Modulation Schemes in OFDM System
In this paper, an OFDM system model is developed for various digital modulation techniques BPSK, QPSK, 8QAM, 16QAM, 32QAM, 64QAM, 128QAM, 256 QAM and 512QAM using simulation in Matrix laboratory language (MATLAB) on which BER calculations is carried out. 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 result of the simulation is shown in the plot of the bit error rate versus Eb /No, which provides information about the system's performance. The convolution coding and interleaving is applied to improve BER performance of OFDM system.