What does the spatial correlation of a signal say about it?How is it different from autocorrelation?
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Spatial correlation is relevant in sensor arrays and MIMO wireless communications. In the case of MIMO communications where multiple spatially separate antennas receive different observations of a multipath signal, spatial correlation can be used to evaluate the 'antennae diversity'. Higher the diversity, better the mitigation of signal fading effects introduced by the wireless medium. As a result the link quality is improved. http://en.wikipedia.org/wiki/Antenna_diversity