Ecole d'ingénieur et centre de recherche en Sciences du numérique

Two-layer precoding for dimensionality reduction in massive MIMO

Arvola, Antti; Tölli, Antti; Gesbert, David

EUSIPCO 2016, 24th European Signal Processing Conference, 28 August-2 September 2016, Budapest, Hungary

Massive MIMO (multiple-input multiple-output) is a promising technology for the upcoming 5G as it provides significant beamforming gains and interference reduction capabilities due to the large number of antennas. However, massive MIMO is computationally demanding, as the high antenna count results in high-dimensional matrix operations when conventional MIMO processing is applied. In this paper, we focus on twostage digital beamforming, where the beamformer is split into a slow-varying statistics-based outer beamformer and an inner beamformer accounting for fast channel variations. We formulate two two-stage precoding optimization problems: weighted sumrate maximization and minimum user rate maximization for a single-cell downlink system. We also provide different heuristic methods of forming the outer precoder matrix via user channel covariance, while the inner precoder is obtained as a result for the optimization problem. Unlike most previous work, which consider the outer precoder design based on energy maximization and user group location, our aim is to design it to offer a tradeoff between energy maximization and interference reduction, and also take into account the fairness between users. We evaluate the performance of the different heuristic methods as a function of the number of statistical pre-beams and a fixed user angular spread to see the overall effect of complexity reduction on the system sum-rate and minimum user rate. We also evaluate the advantages of different methods in terms of user fairness.

Document Doi Bibtex

Titre:Two-layer precoding for dimensionality reduction in massive MIMO
Type:Conférence
Langue:English
Ville:Budapest
Pays:HONGRIE
Date:
Département:Systèmes de Communication
Eurecom ref:4999
Copyright: © 2016 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Bibtex: @inproceedings{EURECOM+4999, doi = {http://dx.doi.org/10.1109/EUSIPCO.2016.7760599}, year = {2016}, title = {{T}wo-layer precoding for dimensionality reduction in massive {MIMO}}, author = {{A}rvola, {A}ntti and {T}{\"o}lli, {A}ntti and {G}esbert, {D}avid}, booktitle = {{EUSIPCO} 2016, 24th {E}uropean {S}ignal {P}rocessing {C}onference, 28 {A}ugust-2 {S}eptember 2016, {B}udapest, {H}ungary}, address = {{B}udapest, {HONGRIE}}, month = {08}, url = {http://www.eurecom.fr/publication/4999} }
Voir aussi: