A SIGNAL COMBINER SYSTEM

摘要

A method of signal combining, comprises the addition of a number of received bandpass signals occupying different spectral positions to give a signal sum, the spectral replication of the resulting signals using bandpass sampling, and the interpolation over at least one frequency bandwidth of the combined and spectrally relocated signals, producing a combined digital signal. The individual received signals may be first spectrally relocated to individual integer positioned intermediate frequencies where the individual received signals are not appropriately positioned for bandpass sampling and interpolation, prior to adding the signals and bandpass sampling. The bandpass sampling is preferably second-order or higher order. The method may be used in frequency or time diversity systems or for demodulating a frequency-hopping spread spectrum signal without a priori knowledge of the frequency-hop pattern.