Robust beamforming in the MISO downlink with quadratic channel estimation and optimal training

Authors:
Gan Zheng;Shaodan Ma;Kai-Kit Wong;Tung-Sang Ng
Affiliations:
University College London, UK;Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong;University College London, UK;Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong
Venue:
IEEE Transactions on Wireless Communications
Year:
2009

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Abstract

Estimation of the channel state information (CSI) in quadratic form (i.e., quadratic channel estimation) in the downlink can be performed at the base station by using the relayed signals from the mobile users, which facilitates optimization with transmitter CSI. In this letter, the condition for the optimal training sequence for quadratic channel estimation in a multiuser multiple-input single-output (MISO) antenna system in the downlink is first obtained. The mean-square-error (MSE) in the CSI estimate is then analyzed. Based on the quadratic CSI estimates, a robust beamforming optimization algorithm to minimize the base station power while achieving individual users' quality-of-service (QoS) constraints, measured by the MSE in data reception, is proposed.