A new design concept for high performance fading channel simulators using random wobble

Abstract

In this paper, a new technique which employs random wobble on the method of exact Doppler spread (MEDS) for the design of high performance Rayleigh fading channel simulators was proposed. The new method could be used on any deterministic parameter computation method in theory, such as the method of equal areas (MEA), the method of equal distance (MED) and the LP norm method (LPNM), etc, and if the random wobble amplitude is set to be an infinitesimal real value, the autocorrelation (ACF) of inphase (quadrature) components will converge to the ones of reference model exactly. Due to the ACF arithmetic errors of the inphase and quadrature components compensate each other over a determined domain; The ACF of complex waveform matches the desired ones perfectly even if the number of sinusoids is a single-digit integer. Simulation results show that the proposed method is useful for the design of simulation models for diversity-combined fading channels, frequency-selective channels, and multiple-input multiple-output (MIMO) channels; moreover, it has many kinds of realization and can be directly used to simulating multiple uncorrelated Rayleigh fading waveforms with low model complexity and low computation costs.