Use of convolution coding for improving SER performance of OFDM system

The paper describes the transmission of BPSK signals in an OFDM system with 64-point IFFT at transmitter and FFT at receiver. The channel over which transmission will take place is ISI Rayleigh fading channel given by 2 tap channel model with path delay [0, 0.5] μs. The sampling frequency of OFDM is to be kept at 20MHz. Cyclic prefix for OFDM is calculated for improving bandwidth efficiency of the system. First, the symbol error rate (SER) of un coded OFDM system is plotted as a function of SNR via simulation in MATLAB and then the result is compared with coded OFDM system's SER plot, where the coding is provided by ½ rate convolution encoder accompanied by viterbi decoder at the receiver side.