System and method for downlink channel estimation in massive multiple-input-multiple-output (MIMO)
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United States of America Patent
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Apr 2, 2019
Grant Date -
Sep 28, 2017
app pub date -
Nov 30, 2016
filing date -
Mar 24, 2016
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Abstract
It is possible to reduce the overhead associated with downlink channel estimation in massive Multiple-Input-Multiple-Output (MIMO) networks by processing training sequences according to a transformation matrix. The transformation matrix maps a generic dictionary to a non-generic dictionary associated with an antenna geometry of a MIMO antenna array. The transformation matrix can be computed based on the two dictionaries. In one embodiment, the training reference signal is precoded to obtain a precoded training reference signal, which is then transmitted over a MIMO antenna array. The training precoder used to precode the training reference signal is designed according to the transformation matrix to mitigate a dependence that the training reference signal transmission has on the antenna geometry.
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