A Multiuser Interference Cancellation Scheme for Uplink OFDMA

Manohar, S and Tikiya, V and Sreedhar, D and Chockalingam, A (2006) A Multiuser Interference Cancellation Scheme for Uplink OFDMA. In: IEEE Wireless Communications and Networking Conference, APR 03-06, 2006, Las Vegas, NV,, pp. 810-815.

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Abstract

In uplink orthogonal frequency division multiple access (OFDMA) systems, multiuser interference (MUI) occurs due to different carrier frequency offsets (CFO) of different users at the receiver. In this paper, we present a multistage linear parallel interference cancellation (LPIC) approach to mitigate the effect of this MUI in uplink OFDMA. The proposed scheme first performs CFO compensation (in time domain), followed by K DFT operations (where K is the number of users) and multistage LPIC on these DFT outputs. We scale the MUI estimates by weights before cancellation and optimize these weights by maximizing the signal-to-interference ratio (SIR) at the output of the different stages of the LPIC. We derive closed-form expressions for these optimum weights. The proposed LPIC scheme is shown to effectively cancel the MUI caused by the other user CFOs in uplink OFDMA.

Item Type:	Conference Paper
Series.:	IEEE Wireless Communications and Networking Conference
Publisher:	IEEE
Additional Information:	Copyright 2006 IEEE. Personal use of this material is permitted.However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords:	Uplink OFDMA; carrier frequency offset; multiuser interference; interference cancellation; optimum weights
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	07 Mar 2011 05:27
Last Modified:	07 Mar 2011 05:27
URI:	http://eprints.iisc.ac.in/id/eprint/35924

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