Digital simulation of a multipath communication channel

Digital mathematical models of a multipath radio channel are considered. A four-parameter distribution of the modulus and phase of the radio channel’s complex transmission coefcient is described within the framework of a general Gaussian radio-channel model. A scatter channel is characterized by a discrete multipath efect; therefore, the complex transmission coefcient of such a channel is represented as the sum of a fnite number of summands with fuctuating transmission coefcients and delays. The communication channel’s output signal is represented through quadrature components, which consider fuctuations in the transmission coefcients and delays in the communication channel. These components in the channels are formed by summing up a large number of summands when the requirements of the central limit theorem of probability theory are satisfed, and therefore they can be considered independent non-stationary Gaussian processes. Formulas are given that determine a procedure for signal simulation at the output of a multipath communication channel. It is shown that, using the four-parameter distribution of the received signal’s amplitudes and phases, it is possible to carry out the computer simulation of a multipath channel with any laws of signal depression in the radio communication channel.