Hybrid Multi-User Precoding with Amplitude and Phase Control

There has been a strong interest in understanding hybrid precoding tradeoffs for millimeter wave (mmW) multi-input multi-output (MIMO) systems. A common assumption in most of these works is that the analog part of the hybrid precoder can only be designed with phase shifters. The consequent search fo...

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Vydané v:2018 IEEE International Conference on Communications (ICC) s. 1 - 6
Hlavní autori: Castellanos, Miguel R., Raghavan, Vasanthan, Ryu, Jung H., Koymen, Ozge H., Li, Junyi, Love, David J., Peleato, Borja
Médium: Konferenčný príspevok..
Jazyk:English
Vydavateľské údaje: IEEE 01.05.2018
Predmet:
Array signal processing
Interference
Millimeter wave technology
Phase control
Precoding
Radio frequency
Signal to noise ratio
ISSN:1938-1883
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Popis
Shrnutí:There has been a strong interest in understanding hybrid precoding tradeoffs for millimeter wave (mmW) multi-input multi-output (MIMO) systems. A common assumption in most of these works is that the analog part of the hybrid precoder can only be designed with phase shifters. The consequent search for analog and digital precoding matrices is solved with different black box-type optimization algorithms. In contrast, this work motivates an analog precoding structure at the base-station end that can be realized with both phase shifters and gain controls. Such a structure is necessary for interference management in multi- user transmissions and is easily realized with low complexity and cost. We then propose a feedback framework of the top-P beams over a beam alignment phase from each user. This framework allows the base-station to reconstruct the channel matrix between it and each user, and to manage interference with a simple zeroforcing solution. Such a structured solution is implemented with the amplitude and phase control of the analog part of the hybrid precoder. We finally illustrate the performance improvement with the proposed solution over simpler constructions such as beam steering that can be implemented with phase shifters alone.
ISSN:1938-1883
DOI:10.1109/ICC.2018.8422136