Channel estimation and hybrid precoding for frequency selective multiuser mmWave MIMO systems
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Date
2018-02
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Publisher
IEEE
Abstract
Configuring the hybrid precoders and combiners
in a millimeter wave (mmWave) multiuser (MU) multiple-input
multiple-output (MIMO) system is challenging in frequency
selective channels. In this paper, we develop a system that uses
compressive estimation on the uplink to configure precoders
and combiners for the downlink (DL). In the first step, the
base station (BS) simultaneously estimates the channels from
all the mobile stations (MSs) on each subcarrier. To reduce
the number of measurements required, compressed sensing
techniques are developed that exploit common support on the
different subcarriers. In the second step, exploiting reciprocity
and the channel estimates, the base station designs hybrid
precoders and combiners. Two algorithms are developed for this
purpose, with different performance and complexity tradeoffs:
1) a factorization of the purely digital solution, and 2) an
iterative hybrid design. Extensive numerical experiments evaluate
the proposed solutions comparing to state-of-the-art strategies,
and illustrating design tradeoffs in overhead, complexity, and
performance.