Experimental Evaluation of the Mimo Wideband Channel Temporal Variation

With perfect channel state information (CSI) at the receiver and/or transmitter, multiple-input multiple-output (MIMO) wireless systems exhibit a large capacity improvement over their single-input single-output (SISO) counterparts. However, when the MIMO channel is time variant, CSI is either imperfect or unavailable, leading to severe reductions in the available capacity [1]. Although a few studies have appeared that characterize the extent of time variation in measured MIMO channels [2], [3], to our knowledge there is no work that presents a comprehensive framework for characterizing and modeling this phenomenon.