Digital Signal Processing Handbook P61
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Systems designed to receive spatially propagating signals often encounter the presence of interference signals. If the desiredsignal andinterferers occupy the same temporal frequency band, thentemporal filtering cannot be usedto separate signal frominterference. However, desiredandinterfering signals often originate fromdifferent spatial locations. This spatial separation can be exploited to separate signal frominterference using a spatial filter at the receiver.
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