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Low-Complexity ICI/ISI Equalization in Doubly Dispersive Multicarrier Systems Using a Decision-Feedback LSQR Algorithm

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6 Author(s)
Taubock, G. ; Inst. of Telecommun., Vienna Univ. of Technol., Vienna, Austria ; Hampejs, M. ; Svac, P. ; Matz, G.
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We propose a low-complexity intercarrier interference/intersymbol interference (ICI/ISI) equalizer for multicarrier transmissions over doubly dispersive channels. Decision-feedback (or interference cancellation) is used with respect to both time and frequency. The ICI stage employs an extension of the iterative LSQR algorithm using groupwise interference cancellation with reliability-based sorting of sets of subcarriers and a band approximation of the frequency-domain channel matrix. The LSQR algorithm is attractive because of its excellent numerical properties and low complexity. Optimal pulse design is optionally considered for shaping the ICI/ISI. Simulation results demonstrate the excellent performance of the proposed ICI/ISI equalizer.

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Signal Processing, IEEE Transactions on  (Volume:59 ,  Issue: 5 )