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October 2014
Mario Hernán Castaneda García
Design of Multiuser Multiantenna Wireless Communication Systems
In this work, limited feedback communication systems with a multi-antenna base station and single antenna users are analyzed. Downlink capacity bounds with channel knowledge subject to estimation, quantization, feedback errors and outdating are derived for the single user case. For the multiuser case, MMSE beamforming and user selection based on the quantized channel direction of the users is presented, along with a lower bound on the achievable sum rate. Threshold-based feedback is also proposed to aid the user selection.
Keywords: imperfect CSI; digital feedback; capacity/sum rate lower bound; MMSE beamforming; user selection
Berichte aus dem Lehrstuhl für Netzwerktheorie und Signalverarbeitung der Technischen Universität München
Edited by Prof. Dr. techn. Josef A. Nossek, München
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