EM-based semi-blind channel estimation method for MIMO-OFDM communication systems

Authors:
D. Obradovic;C. Na;R. Lupas Scheiterer;A. Szabo
Affiliations:
Siemens AG, Corporate Technology, Information and Communications, Munich, Germany;Siemens AG, Corporate Technology, Information and Communications, Munich, Germany;Siemens AG, Corporate Technology, Information and Communications, Munich, Germany;Siemens AG, Corporate Technology, Information and Communications, Munich, Germany
Venue:
Neurocomputing
Year:
2008

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Abstract

This paper presents a novel semi-blind method for channel estimation and symbol detection in multiple input multiple output-orthogonal frequency division multiplexing (MIMO-OFDM) digital communication systems over time-varying channels where the standard pilot-aided channel estimation (PACE) interpolation approaches are not directly applicable due to insufficient placement of pilot sequences over the frequency sub-channels. The presented channel estimation method utilizes the Expectation Maximization (EM) algorithm to exploit the information in the received signals and the statistical properties of the channel.