Uplink/Downlink Duality in Multi-Cell MU-MIMO Systems with Hardware Impairments

Conference: WSA 2016 - 20th International ITG Workshop on Smart Antennas
03/09/2016 - 03/11/2016 at München, Deutschland

Proceedings: WSA 2016

Pages: 7Language: englishTyp: PDF

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Authors:
Zarei, Shahram; Gerstacker, Wolfgang; Schober, Robert (Friedrich-Alexander Universität Erlangen-Nürnberg, Erlangen, Germany)

Abstract:
In this paper, we propose an uplink/downlink duality framework for multi-cell multi-user multiple-input multiple-output (MU-MIMO) systems with residual hardware impairments (HWIs) at the base station and the user terminals. By employing the proposed uplink/downlink duality framework, complex downlink optimization problems can be transformed to equivalent dual uplink problems which are easier to solve. Thereby, for the same total transmit power, the same per-user signal-to-interference-plus-noise ratios (SINRs) are achieved in downlink and uplink. We apply the proposed uplink/downlink duality, and derive a multi-cell HWI aware minimum mean square error (MCHWA-MMSE) precoder. Our simulation results show that the proposed MCHWA-MMSE precoder achieves a substantially higher sum rate than conventional MMSE and conjugate beamforming precoders.