A Simple Expression of BER Performance in DPSK/OFDM Systems with Post-Detection Diversity Reception

In this letter, we propose a simple but accurate calculation method, that is, an approximate closed-form equation of average bit error rate in DPSK/OFDM systems with post-detection diversity reception over both timeand frequency-selective Rayleigh fading channels. The validity of the proposed method is verified by the fact that BER performances given by the derived equation coincide with those by Monte Carlo simulation. key words: DPSK/OFDM, post-detection diversity, Doppler frequency shift, delay spread, closed-form equation