What does the spatial correlation of a signal say about it?How is it different from autocorrelation?
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