.7-35, while scalars r and n denote the auxiliary the basic unit of information in the channel (symbol or polarisation angle and polarisation phase difference, re- bit); therefore, the wideband channel is usually modelled spectively. In [ThYo03], the angle spread in both azimuth by a channel impulse response, where the magnitude of and elevation are modelled by uniform distributions. In the different paths are taken as for the narrowband case. addition, the azimuth spread and elevation spread values In most cases, under LoS, only the first path is mod- are the maximum deviation of the angle spread from elled as being Rice distributed, since this path' includes mean direction of arrival. Let O be a spatial vector pa- the LoS component, all other paths' magnitudes being rameter denoting O = [ , 0, r, n]T, where | represents modelled by a Rayleigh distribution. This approach was transpose; therefore, the spatial fading correlation be- already suggested in [Corr01], where the Rice factor of tween any elements (m,n) of the EVS can be expressed as the first path is derived as a function of the narrowband Elan())am(()) Rice factor, the system bandwidth, and the RMS delay spread of the propagation channel. Nevertheless, the proposed description of the Rice factor is only valid for a certain structure of the channel impulse response. A different approach to overcome the bandwidth dependence of modelling parameters is based on the use of the time-variant transfer function instead of the time-var- iant impulse response, such that all known properties from narrowband models can be applied [Corr01], [Katt02]. A time-domain technique for fading depth charac- terisation in wideband Rayleigh and Ricean environ- (4.7.14) ments, described by its PDPs, is proposed in [CaCo02]. The PDF of the received power, S, is given by where E[] denotes expectation, the superscript * signifies the complex conjugate, the scalar p(O) is the joint PDF for all the four parameters, and am are the mth entries of p(s) = a(O). Illustrative results for a