Beamforming in TDD MIMO systems with asymmetric antenna configuration
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United States of America Patent
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Sep 3, 2019
Grant Date -
Jan 18, 2018
app pub date -
Mar 17, 2017
filing date -
Jul 13, 2016
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Abstract
Beamforming in time division duplex (TDD) multiple input, multiple output (MIMO) systems is discussed involving user equipments (UEs) having asymmetric antenna configurations. Aspects of the present disclosure use different combinations of signaling overhead and feedback along with leveraging the channel reciprocity characteristics of TDD systems in order to determine channel estimates for determining beamforming vectors. Additional aspects determine scheduling between UEs with symmetric receiver/transmission chains and asymmetric receiver/transmission chains to optimize reference signal overhead for groups of UEs with common beamforming processes.
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