Robust Semi-Blind Estimation for Beamforming Based MIMO Wireless Communication

Murthy, Chandra R and Jagannatham, Aditya K and Rao, Bhaskar D (2008) Robust Semi-Blind Estimation for Beamforming Based MIMO Wireless Communication. In: IEEE Global Telecommunications Conference (GLOBECOM 08), NOV 30-DEC 04, 2008, New Orleans, LA.

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Abstract

In this paper, we present robust semi-blind (SB) algorithms for the estimation of beamforming vectors for multiple-input multiple-output wireless communication. The transmitted symbol block is assumed to comprise of a known sequence of training (pilot) symbols followed by information bearing blind (unknown) data symbols. Analytical expressions are derived for the robust SB estimators of the MIMO receive and transmit beamforming vectors. These robust SB estimators employ a preliminary estimate obtained from the pilot symbol sequence and leverage the second-order statistical information from the blind data symbols. We employ the theory of Lagrangian duality to derive the robust estimate of the receive beamforming vector by maximizing an inner product, while constraining the channel estimate to lie in a confidence sphere centered at the initial pilot estimate. Two different schemes are then proposed for computing the robust estimate of the MIMO transmit beamforming vector. Simulation results presented in the end illustrate the superior performance of the robust SB estimators.

Item Type:	Conference Paper
Series.:	IEEE Global Telecommunications Conference (Globecom)
Publisher:	IEEE
Additional Information:	Copyright 2008 IEEE. Personal use of this material is permitted.However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	08 Apr 2011 05:42
Last Modified:	08 Apr 2011 05:42
URI:	http://eprints.iisc.ac.in/id/eprint/36593

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