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International Journal of Digital Multimedia Broadcasting
Volume 2009 (2009), Article ID 194148, 7 pages
http://dx.doi.org/10.1155/2009/194148
Research Article

Exploiting Redundancy in an OFDM SDR Receiver

Department of Telecommunications, Slovak University of Technology, Ilkovicova 3, 812 19 Bratislava, Slovakia

Received 1 September 2008; Accepted 10 February 2009

Academic Editor: Daniel Iancu

Copyright © 2009 Tomas Palenik and Peter Farkas. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Common OFDM system contains redundancy necessary to mitigate interblock interference and allows computationally effective single-tap frequency domain equalization in receiver. Assuming the system implements an outer error correcting code and channel state information is available in the receiver, we show that it is possible to understand the cyclic prefix insertion as a weak inner ECC encoding and exploit the introduced redundancy to slightly improve error performance of such a system. In this paper, an easy way to implement modification to an existing SDR OFDM receiver is presented. This modification enables the utilization of prefix redundancy, while preserving full compatibility with existing OFDM-based communication standards.