High speed signal processing in a programmable propagation simulator

Abstract

The real-time channel simulator described is an experimental apparatus designed not only to model a wideband channel, but also as a flexible machine for experimentation on propagation models and effects. The authors describe the signal processing techniques used to model fading phenomena as well as the use of high-speed quadrature signal processing in the front end. The novel features of this simulator include the fully digital means of dividing the in-phase and quadrature inputs and generating quadrature outputs. A large dynamic memory in the computer interface makes it possible to capture input and output data for further analysis, while the fully digital quadrature processing effectively eliminates phase errors and overwrought RF processing. >