A New Semiblind Scheme Based on Second and Fourth Order Statistics for Decoding of Space---Time Data in Time Selective MIMO Channels

Authors:
Manav R. Bhatnagar;R. Vishwanath
Affiliations:
UniK-University Graduate Center, University of Oslo, Kjeller, Norway 2027;Department of Electrical and Computer Engineering, University of California, Davis, USA 95616
Venue:
Wireless Personal Communications: An International Journal
Year:
2008

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Abstract

In this paper we propose a novel semiblind scheme based on second and fourth order statistics of Space---Time data in time varying MIMO channels. This scheme combines a new blind estimator of frequency offsets and an iterative decoder. Space---Time Codes have a periodic property which is used to find a simple and efficient blind estimator of carrier offsets. The iterative decoder is a data aided decoder which provides the best estimates of channel, noise co-variance and S---T data in its category. As a result of this the new semiblind scheme performs very efficiently in time-selective channels and is able to reduce the training overhead required by the data-aided estimators to a large extent, and increase the effective throughput.