Abstract
A theory on intermodulation noise distortion owing to multipath reception in f.m./f.d.m. microwave links is developed for the case when the received signal is Nakagami-Rice distributed, i.e. depends on the addition of a constant signal and a Rayleigh-distributed random signal. The distortion formula derived by Medhurst concerning ‘the small constant echo of short delay’, is verified as a special case of the presented solution. It is shown that the median value of the distortion noise power produced when the echo is a non-coherent random signal may be computed as if the echo were constant with a power equal to the total echo power and with a relative delay time equal to the 2nd-order moment (radius of inertia) of the echo-power function with respect to the constant (direct) signal. The probability distribution of the distortion is derived when the received signal is Nakagami-Rice distributed.
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