Combination of the three types of diversity to design high capacity compact MIMO terminal

Multiple-input-multiple-output (MIMO) schemes designed to increase channel capacity face strong limitations when a large number of antennas must be deployed in a terminal due to size constrains. This letter discusses how the different combinations of the three types of diversities-namely spatial, radiation pattern, and polarization diversity-can be used to get an improved capacity in compact terminals. The study compares realistic combinations that overcome the need for a large number of radiating elements in the user terminal.This work was supported in part by the Spanish Ministry of Sci-ence and Innovation under Project GRE3NSYST (TEC2011-29006-C03-03), Project TEC2013-44019-R, and the CONSOLIDER-INGENIO 2010 program under Project COMONSENS (CSD 2008-00010).Publicad