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Joint data detection and channel estimation for OFDM systems

Cui, Tao and Tellambura, Chinthananda (2006) Joint data detection and channel estimation for OFDM systems. IEEE Transactions on Communications, 54 (4). pp. 670-679. ISSN 0090-6778. http://resolver.caltech.edu/CaltechAUTHORS:CUIieeetc06

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Abstract

We develop new blind and semi-blind data detectors and channel estimators for orthogonal frequency-division multiplexing (OFDM) systems. Our data detectors require minimizing a complex, integer quadratic form in the data vector. The semi-blind detector uses both channel correlation and noise variance. The quadratic for the blind detector suffers from rank deficiency; for this, we give a low-complexity solution. Avoiding a computationally prohibitive exhaustive search, we solve our data detectors using sphere decoding (SD) and V-BLAST and provide simple adaptations of the SD algorithm. We consider how the blind detector performs under mismatch, generalize the basic data detectors to nonunitary constellations, and extend them to systems with pilots and virtual carriers. Simulations show that our data detectors perform well.


Item Type:Article
Additional Information:© Copyright 2006 IEEE. Reprinted with permission. Paper approved by Y. Li, the Editor for Wireless Communications Theory of the IEEE Communications Society. Manuscript received December 15, 2004; revised June 15, 2005. [Posted online: 2006-04-18] This work was supported in part by the Natural Sciences and Engineering Research Council of Canada, Informatics Circle of Research Excellence and Alberta Ingenuity Fund. This paper was presented in part at the IEEE Global Telecommunications Conference, November 2004, Dallas, TX.
Subject Keywords:Channel estimation, orthogonal frequency-division multiplexing (OFDM), sphere decoding (SD)
Issue or Number:4
Record Number:CaltechAUTHORS:CUIieeetc06
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:CUIieeetc06
Alternative URL:http://dx.doi.org/10.1109/TCOMM.2006.873075
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:378
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:26 Oct 2006
Last Modified:22 Jun 2016 22:35

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