Graduate School and Research Center in Digital Sciences

Weighted sum rate maximization for hybrid beamforming design in multi-cell massive MIMO OFDM systems

Kurisummoottil, Thomas Christo; Slock, Dirk TM

EUSIPCO 2019, 27th European Signal Processing Conference, 2-6 September 2019, Coruna, Spain

This work deals with hybrid beamforming (HBF) for the MIMO Interfering Broadcast Channel (IBC), i.e. the Multi-Input Multi-Output (MIMO) Multi-User (MU) Multi-Cell downlink channel, in an orthogonal frequency-division multiplexing (OFDM) system. While most of the existing works on wideband hybrid systems focus on single-user systems and a few on multi-user single-cell systems, we consider HBF design for OFDM systems in the case of multi-cell. We optimize the weighted sum rate (WSR) using minorization and alternating optimization, the result of which is observed to converge fast to a local optimum. We furthermore propose a deterministic annealing based approach to avoid issues of local optima that plague phase shifter constrained analog beamformers. Simulation results indicate that the proposed deterministic annealing based approach performs significantly better than state of the art Weighted Sum Mean Squared Error (WSMSE) or WSR based solutions in a wideband OFDM setting. We also propose a closed form solution for the frequency flat analog BF in case the number of RF chains equals or exceeds the total number of multipath components and the antenna array responses are phasors.

Document Doi Bibtex

Title:Weighted sum rate maximization for hybrid beamforming design in multi-cell massive MIMO OFDM systems
Type:Conference
Language:English
City:Coruna
Country:SPAIN
Date:
Department:Communication systems
Eurecom ref:5945
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Bibtex: @inproceedings{EURECOM+5945, doi = {http://dx.doi.org/10.23919/EUSIPCO.2019.8902748}, year = {2019}, title = {{W}eighted sum rate maximization for hybrid beamforming design in multi-cell massive {MIMO} {OFDM} systems}, author = {{K}urisummoottil, {T}homas {C}hristo and {S}lock, {D}irk {TM}}, booktitle = {{EUSIPCO} 2019, 27th {E}uropean {S}ignal {P}rocessing {C}onference, 2-6 {S}eptember 2019, {C}oruna, {S}pain}, address = {{C}oruna, {SPAIN}}, month = {09}, url = {http://www.eurecom.fr/publication/5945} }
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