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

A massive MIMO stochastic geometry analysis of various beamforming designs with partial CSIT

Thomas, Christo Kurisummoottil; Slock, Dirk TM

SpasWiN 2019, 13th Workshop on Spatial Stochastic Models for Wireless Networks, part of the WIOPT 2019 conference, 7 June 2019, Avignon, France

We consider coordinated beamforming (BF) for the Multi-Input Single-Output (MISO) Interfering Broadcast Channel (IBC). The beamformers are optimized for the Ergodic Weighted Sum Rate (EWSR) or various approximations and bounds thereof, for the case of Partial Channel State Information at the Transmitters (CSIT). Gaussian (posterior) partial CSIT can optimally combine channel estimate and channel covariance information. With Gaussian partial CSIT, the beamformers only depend on the means (estimates) and (error) covariances of the channels. 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. In the Massive MISO (MaMISO) limit, we obtain deterministic approximations of the signal and interference plus noise powers at the receivers for various BFs, which are tight as the number of BS antennas and the total user subspace dimension tend to infinity at fixed ratio. Simulation results exhibit the correctness of the large system results and the performance superiority of optimal BF designs based on both the MaMISO limit of the EWSR and using Linear Minimum Mean Squared Error (LMMSE) channel estimates.

Document Bibtex

Titre:A massive MIMO stochastic geometry analysis of various beamforming designs with partial CSIT
Mots Clés:Massive MIMO, stochastic geometry, partial CSIT, ergodic weighted sum rate, optimal beamforming
Type:Invited paper in a conference
Département:Systèmes de Communication
Eurecom ref:5868
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Bibtex: @inproceedings{EURECOM+5868, year = {2019}, title = {{A} massive {MIMO} stochastic geometry analysis of various beamforming designs with partial {CSIT}}, author = {{T}homas, {C}hristo {K}urisummoottil and {S}lock, {D}irk {TM}}, booktitle = {{S}pas{W}i{N} 2019, 13th {W}orkshop on {S}patial {S}tochastic {M}odels for {W}ireless {N}etworks, part of the {WIOPT} 2019 conference, 7 {J}une 2019, {A}vignon, {F}rance}, address = {{A}vignon, {FRANCE}}, month = {06}, url = {} }
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