Downlink Spectral Efficiency of Massive MIMO with Dual-Polarized Antennas
Conference: WSA 2021 - 25th International ITG Workshop on Smart Antennas
11/10/2021 - 11/12/2021 at French Riviera, France
Proceedings: ITG-Fb. 300: WSA 2021
Pages: 6Language: englishTyp: PDF
Authors:
Oezdogan, Oezgecan (Department of Electrical Engineering (ISY), Linköping University, Sweden)
Bjoernson, Emil (Department of Electrical Engineering (ISY), Linköping University, Sweden & Department of Computer Science, KTH Royal Institute of Technology, Sweden)
Abstract:
This paper considers the downlink of a single-cell massive MIMO (multiple-input multiple-output) system with dual-polarized antennas at both the base station and users. We consider a channel model that takes into account several practical aspects that arise when utilizing dual polarization, such as channel cross-polar discrimination (XPD) and cross-polar receive and transmit correlations (XPC). We derive the statistical properties of the minimum mean squared error (MMSE) channel estimator for this model. Using these estimates for maximum ratio precoding, a rigorous closed-form downlink spectral efficiency (SE) expression is derived. We compare the SEs achieved in dual-polarized and uni-polarized setups numerically and evaluate the impact of XPD on the downlink SE.