A diversity channel model using multiple tapped-delay lines characterized by lag-delay correlations

Abstract

A channel model is proposed for the purpose of Monte-Carlo simulation of the frequency-selective (wideband) vector channel between a subscriber and an array-enhanced base station. The model is defined in the baseband equivalent, discrete-time domain and can therefore be represented as multiple tapped-delay lines (one per diversity branch). It is based on the wide-sense stationary, uncorrelated scattering (WSSUS) assumption and includes not only the radio channel itself but also the transmitting and receiving fixed filters. Each tap coefficient corresponds to a complex gaussian variate which is correlated with other taps at different branches and different delays. The ensemble of tap coefficients constitutes a complex multivariate gaussian process whose statistics can be entirely defined with an analytically-derived lag-delay correlation function (where the term lag denotes spatial separation between two elements).