Open Access

Advanced Receiver Design for Quadrature OFDMA Systems

EURASIP Journal on Wireless Communications and Networking20092009:953018

DOI: 10.1155/2009/953018

Received: 1 August 2008

Accepted: 24 January 2009

Published: 26 February 2009

Abstract

Quadrature orthogonal frequency division multiple access (Q-OFDMA) systems have been recently proposed to reduce the peak-to-average power ratio (PAPR) and complexity, and improve carrier frequency offset (CFO) robustness and frequency diversity for the conventional OFDMA systems. However, Q-OFDMA receiver obtains frequency diversity at the cost of noise enhancement, which results in Q-OFDMA systems achieving better performance than OFDMA only in the higher signal-to-noise ratio (SNR) range. In this paper, we investigate various detection techniques such as linear zero forcing (ZF) equalization, minimum mean square error (MMSE) equalization, decision feedback equalization (DFE), and turbo joint channel estimation and detection, for Q-OFDMA systems to mitigate the noise enhancement effect and improve the bit error ratio (BER) performance. It is shown that advanced detections, for example, DFE and turbo receiver, can significantly improve the performance of Q-OFDMA.

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Authors’ Affiliations

(1)
Department of Information Engineering, the Australian National University
(2)
Canberra Research Laboratory, National ICT Australia (NICTA)

Copyright

© Lin Luo et al 2009

This article is published under license to BioMed Central Ltd. 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.