Performance of Gaussian and hyperbolic scattering channels in mobile OFDM systems

Abstract

This paper estimates the inter-carrier-interference power P ICI 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 P ICI difference of the two channels is estimated and plotted as functions of ( τ , ζ ) , ( τ , ϵ ) and ( τ , f d T s ) , where τ is the ratio of the coverage distance D and effective radius R eff , ζ frequency tracking, f d maximum Doppler spread, T s symbol duration and ϵ travelling direction of a user equipment. Experimental P ICI difference for ϵ = 0 , ζ = 0 and f d T s = 0.05 is obtained and plotted with the simulated results for comparison purposes. The ICI power is also plotted against ( f d T s , ϵ ) , ( f d T s , ζ ) , and ( ζ , ϵ ) 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 P ICI and phase noise to validate the effectiveness of the approximate Gaussian and hyperbolic AoA pdfs. Future work is also outlined.