Performance Analysis of Wideband Sum-of-Cisoids-Based Channel Simulators with Respect to the Bit Error Probability of DPSK OFDM Systems

In this paper, we analyze the performance of a wideband sum-of-cisoids (SOC) channel simulator w.r.t. the bit error probability (BEP) of differential phase-shift keying (DPSK) orthogonal frequency division multiplexing (OFDM) systems. Analytical BEP expressions are derived for coherent and noncoherent DPSK OFDM simulation systems in the presence of a wideband SOC channel simulator. We also study the degradations of the BEP introduced by an imperfect channel simulator. Using the deviation of the BEP as an appropriate measure, we evaluate the performance of three parameter computation methods, known as the method of exact Doppler spread (MEDS), the randomized MEDS (R-MEDS), and the Monte Carlo method (MCM). For coherent DPSK OFDM systems, it turns out that these three methods are equivalent. For noncoherent DPSK OFDM systems, it is theoretically shown that both the MEDS and the R-MEDS outperform the MCM. The correctness of all theoretical results are validated by simulations.