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Title: Intercarrier interference suppression for OFDMA uplink in time- and frequency-selective fading channels
Authors: Hou, S.-W.
Ko, C.C. 
Keywords: Channel estimation
Doppler diversity
Doubly selective fading channel
Inter-carrier interference (ICI)
Orthogonal frequency division multiple access (OFDMA)
Orthogonal frequency-division multiple access (OFDMA)
Issue Date: 2009
Citation: Hou, S.-W., Ko, C.C. (2009). Intercarrier interference suppression for OFDMA uplink in time- and frequency-selective fading channels. IEEE Transactions on Vehicular Technology 58 (6) : 2741-2754. ScholarBank@NUS Repository.
Abstract: This paper investigates intercarrier interference (ICI) suppression and channel estimation for the uplink of an orthogonal frequency-division multiple-access (OFDMA) system in a time- and frequency-selective fading channel. In such a doubly selective channel, channel variations within each OFDMA block disrupt the orthogonality among subcarriers and leads to ICI. We develop an appropriate signal model for the OFDMA uplink in a doubly selective fading channel and propose a minimum mean square error (MMSE) scheme and an MMSE successive detection (MMSE-SD) scheme to suppress ICI. It is shown that the MMSE scheme is the optimal linear scheme in terms of maximizing achievable data rate and that the MMSE-SD scheme is able to further remove ICI and exploit the Doppler diversity embedded in time-varying channels. As an essential component in ICI suppression, channel estimation is also considered. A basis expansion model (BEM) is formulated for the OFDMA uplink channel, and a pilot-aided channel-estimation algorithm is developed to track users' channels in the time domain. Simulation results are presented to illustrate the overall performance improvements that can be obtained from using the proposed ICI suppression and channel-estimation schemes. © 2009 IEEE.
Source Title: IEEE Transactions on Vehicular Technology
ISSN: 00189545
DOI: 10.1109/TVT.2008.2010550
Appears in Collections:Staff Publications

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