An Efficient Wideband Channel Emulator Based on Orthogonal Function Expansion

In this paper we propose an architecture for the development of a single input-single output (SISO) time-variant wideband channel emulator based on orthogonal functions. The proposal is adequate for hardware implementation of the stochastic wideband channel model with separable Scattering Function, allowing a big reduction on the implementation complexity when compared to direct approaches. This gain comes from the channel orthogonalization concept in which only a reduced set of artificial paths - as opposed to the large set of physical paths are implemented. This approach allows a fully characterization of the channel statistics and ensures a predefined performance in terms of the mean square error (MSE), which can not be achieved by any direct channel emulator approach.