Performance of Gaussian and hyperbolic scattering channels in mobile OFDM systems

This paper estimates the inter-carrier-interference power PICI of Gaussian and hyperbolic scattering channels in a mobile orthogonal frequency division multiplexing (OFDM) system by using their angle-of-arrival (AoA) probability density functions (pdf). The PICI difference of the two channels is estimated and plotted as functions of (τ,ζ), (τ, є) and (τ,fdTs), where τ is the ratio of the coverage distance D and effective radius Reff, ζ frequency tracking, fd maximum Doppler spread, Ts symbol duration and travelling direction of a user equipment. Experimental PICI difference for є=0, ζ=0 and fdTs=0.05 is obtained and plotted with the simulated results for comparison purposes. The ICI power is also plotted against (fdTs, є), (fdTs,ζ), and (ζ, є) for specific values of τ. Detailed analyses on the performance of the hyperbolic and Gaussian AoA pdfs are given. Relative merits of each pdf are discussed. Closed-form bit error rate (BER) expressions of OFDM communication systems in an added white Gaussian noise (AWGN) channel and Rayleigh fading environment using bipolar phase shift keying (BPSK), OFDM-BPSK, are derived as functions of PICI and phase noise to validate the effectiveness of the approximate Gaussian and hyperbolic AoA pdfs. Future work is also outlined.