Graduate School and Research Center in Digital Sciences

Massive MISO IBC reduced order zero forcing beamforming - A multi-antenna stochastic geometry perspective

Kurisummoottil Thomas, Christo; Slock, Dirk TM

ICNC 2019, International Conference on Computing, Networking and Communications, February 18-21, 2019, Honolulu, Hawaii, USA

In a multi-user multi-antenna interfering broadcast channel (IBC) system, optimal linear receive and transmit beamformers are of the Maximum Signal-to-Interference-plus-Noise (MaxSINR) type. These designs make an optimal compromise between noise enhancement and interference suppression and reduce to matched filters at low SNR and zero-forcing at high SNR . The novel beamformers are here optimized for the Expected Weighted Sum Rate (EWSR) for the case of Partial Channel State Information at the Transmitters (CSIT). We consider a Gaussian partial CSIT model, combining channel estimates and covariance information. We constrain the transceiver to either zero-force or ignore each interference term. This leads to a reduced-order zero-forcing (RO-ZF) design in which the number of interference terms being zero-forced increases with SNR. We extend a recently introduced large system analysis for optimized beamformers with partial CSIT, by a stochastic geometry inspired randomization of the channel covariance eigen spaces, leading to much simpler analytical results which depend only on some essential channel characteristics. RO-ZF designs lead to variable reductions of computational complexity and CSI requirements.

Document Doi Bibtex

Title:Massive MISO IBC reduced order zero forcing beamforming - A multi-antenna stochastic geometry perspective
Department:Communication systems
Eurecom ref:5749
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Bibtex: @inproceedings{EURECOM+5749, doi = {}, year = {2019}, title = {{M}assive {MISO} {IBC} reduced order zero forcing beamforming - {A} multi-antenna stochastic geometry perspective}, author = {{K}urisummoottil {T}homas, {C}hristo and {S}lock, {D}irk {TM}}, booktitle = {{ICNC} 2019, {I}nternational {C}onference on {C}omputing, {N}etworking and {C}ommunications, {F}ebruary 18-21, 2019, {H}onolulu, {H}awaii, {USA}}, address = {{H}onolulu, {UNITED} {STATES}}, month = {02}, url = {} }
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