The mobile radio channel can be simulated as a complex-valued random process with a time-varying variance. This paper describes an implementation of that process using a real-time Digital Signal Processing (DSP) technique. The simulator design permits the user to select the simulation parameters, including: vehicular speed, carrier frequency, ratio between the line-of-sight component and the multipath component, and the variance of average power. The design is based on variable sampling rate DSP techniques, and offers a novel solution to suppress the aliasing terms at intermediate stages where access to analog filters is cumbersome and costly.

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Journal IEEE Transactions on Instrumentation and Measurement
Goubran, R, Hafez, H.M., & Sheikh, A.U.H. (1991). Implementation of a Real-time Mobile Channel Simulator Using A DSP Chip. IEEE Transactions on Instrumentation and Measurement, 40(4), 709–714. doi:10.1109/19.85339