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A multiuser interference cancellation scheme for uplink OFDMA

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4 Author(s)
Manohar, S. ; Dept. of ECE, Indian Inst. of Sci. ; Tikiya, V. ; Sreedhar, D. ; Chockalingam, A.

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

Published in:

Wireless Communications and Networking Conference, 2006. WCNC 2006. IEEE  (Volume:2 )

Date of Conference:

3-6 April 2006