Single-Tap Precoders and Decoders for Multiuser MIMO FBMC-OQAM Under Strong Channel Frequency Selectivity

The design of linear precoders or decoders for multiuser multiple-input multiple-output filterbank multicarrier (FBMC) modulations in the case of a strong channel frequency selectivity is presented. The users and the base station (BS) communicate using space division multiple access. The low complex...

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Vydané v:IEEE transactions on signal processing Ročník 65; číslo 3; s. 587 - 600
Hlavní autori: Rottenberg, Francois, Mestre, Xavier, Horlin, Francois, Louveaux, Jerome
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: IEEE 01.02.2017
Predmet:
Base stations
Complexity theory
Decoding
Distortion
FBMC
Frequency modulation
frequency selective channel
MIMO
MU MIMO
OFDM
ISSN:1053-587X, 1941-0476
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Popis
Shrnutí:The design of linear precoders or decoders for multiuser multiple-input multiple-output filterbank multicarrier (FBMC) modulations in the case of a strong channel frequency selectivity is presented. The users and the base station (BS) communicate using space division multiple access. The low complexity proposed solution is based on a single tap per-subcarrier precoding/decoding matrix at the BS in the downlink/uplink. As opposed to classical approaches that assume flat channel frequency selectivity at the subcarrier level, the BS does not make this assumption and takes into account the distortion caused by channel frequency selectivity. The expression of the FBMC asymptotic mean squared error (MSE) in the case of strong channel selectivity derived in earlier works is developed and extended. The linear precoders and decoders are found by optimizing the MSE formula under two design criteria, namely zero forcing or minimum MSE. Finally, simulation results demonstrate the performance of the optimized design. As long as the number of BS antennas is larger than the number of users, it is shown that those extra degrees of freedom can be used to compensate for the channel frequency selectivity.
ISSN:1053-587X
1941-0476
DOI:10.1109/TSP.2016.2621722