Manohar, S. ; Tikiya, V. ; Sreedhar, D. ; Chockalingam, A. (2006) A multiuser interference cancellation scheme for uplink OFDMA In: IEEE Wireless Communications and Networking Conference, 2006. WCNC 2006., 3-6 April 2006, Las Vegas, USA.
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Official URL: http://ieeexplore.ieee.org/document/1683574/
Related URL: http://dx.doi.org/10.1109/WCNC.2006.1683574
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 or Workshop Item (Paper) |
|---|---|
| Source: | Copyright of this article belongs to Institute of Electrical and Electronics Engineers. |
| ID Code: | 102402 |
| Deposited On: | 26 Mar 2017 14:32 |
| Last Modified: | 26 Mar 2017 14:32 |
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