MIMO for ATSC 3.0


This paper provides an summary of the optional multiple-input multiple-output (MIMO) antenna theme adopted in ATSC to enhance robustness or increase capability via additional spatial diversity and multiplexing by sending two information streams in a very single radio frequency channel. Though it is not directly specified, it's expected in follow to use cross-polarized a pair of×2 MIMO (i.e., horizontal and vertical polarization) to retain multiplexing capabilities in line-of-sight conditions. MIMO allows overcoming the channel capacity limit of single antenna wireless Communications in an exceedingly given channel bandwidth while not any increase in the entire transmission power. However in the U.S. MIMO can truly provide a larger comparative gain because it might be allowed to extend the total transmit power, by transmitting the nominal transmit power in every polarization. Hence, in addition to the MIMO gains (array, diversity, and spatial multiplexing), MIMO may exploit an additional three dB power gain. The MIMO scheme adopted in ATSC re-uses the single-input single-output antenna baseline constellations, and hence it introduces the employment of MIMO with non-uniform constellations.

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