A simulator for time-varying multipath fading channels

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2000
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Kong, Xiangming
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Barton, Richard J.
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Abstract
Multipath fading is a common phenomenon in signal transmission. Understanding this phenomenon is very important in many applications such as in the study of optimal detectors. To acquire better knowledge of the channel behavior, a channel simulator is needed. Previous channel simulators are limited in their use due to the fact that they are tailored to certain kinds of channels. In this research, a channel simulator appropriate for arbitrary spread-spectrum waveforms transmitted over arbitrary time-varying, frequency-selective Rayleigh fading channels is developed and implemented. Both Doppler (or time) diversity and delay (or frequency) diversity are considered in the model. The channel is assumed to be a time-varying Gaussian channel that obeys the wide-sense stationary, uncorrelated scattering assumptions. The scattering function of the channel determines channel characteristics. The model developed consists of multiple Doppler-shifted branches of tap-delay lines. No assumption is made regarding the independence of the channel taps. Rather, the correlation structure of the taps predicted by the scattering function is computed and utilized. Examples of simulation results for different types of channels are presented and discussed to demonstrate the validity of the simulator.
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