Performance predictions for troposcatter channels with multipath are developed using the eigenvalues in the Karhunen-Loeve representation of the tropo signal. Flat Rayleigh fading predictions, in the presence of jamming, are easily extended to multipath channels with this technique.>

A unified discrete channel model from the information source up to the sampler was developed for fading multipath channels. Different methods for adaptive channel measurement was studied. The performance of a discrete matched filter using different adaptation techniques and working over a troposcatter channel is predicted. It is shown that the effects of channel measurement noise are less damaging for the decision-directed adaptation technique as compared to any kind of reference-directed adaptation.>

Performance predictions of a Rayleigh fading channel are calculated for a troposcatter radio in the presence of two line-of-sight (LOS) jammers. The receiver incorporates dual main antennas and a sidelobe canceller. The countermeasure approach used is array processing. A communications approach is taken, with the goal of deriving an analytic expression for the bit error rate, in terms of the signal-to-noise ratio. After deriving the general solution, an approximation is introduced and proposed as an alternative measure of performance. It is insensitive to the fine-grain structure of the problem geometry, and it contains a minimal number of parameters, namely, the various signal energies reaching the receiver.>