A Frequency Domain Variable Data Rate Frequency Hopping Channel Model for the Mobile Radio Channel

Modeling of the mobile radio channel is considered. Starting from a physical model, a frequency domain description of the channel is obtained. It is then shown that the effect of fading and dispersion can be entirely modeled using frequency transform techniques. Due to the bandlimitation of the simulated stochastic processes, the channel impulse response (CIR) model works on discrete time samples in both time and delay direction. Besides its computational efficiency an advantage of the technique is that the channel center frequency and the normalization unit (ie. the sample duration Ts) for the physical delay spread remain as generic parameters. The generic property of the model is its major advantage especially in the evaluation of new, unspecified scenarios. Due to the block–oriented processing, the fading-bandwidth–delayspread product is limited for this modeling technique. Applications to typical mobile radio data transmission scenarios conclude the paper. Keywords—Fading Channels, Simulation, Radio Communication