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A Spectral Approach to Inter-Carrier Interference Mitigation in OFDM Systems

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3 Author(s)
Septimus, A. ; Fac. of Eng., Bar Ilan Univ., Ramat-Gan, Israel ; Keller, Y. ; Bergel, I.

In this paper, we propose a new method for intercarrier interference (ICI) mitigation in orthogonal frequency-division multiplexing (OFDM) systems. The proposed approach views the signal reconstruction problem at the receiver end as an integer least squares (ILS) problem, and uses a recently developed spectral approach called sequential probabilistic ILS (SPILS) to solve it. The proposed approach outperforms other state-of-the-art approaches while having the same computational complexity. In addition, we present a novel extension to the SPILS scheme that allows the generation of soft decisions (for communication systems which use soft-decision decoding). The use of soft-decision decoding (naturally) brings significant improvement in the detection reliability, and we show that the proposed method again outperforms other state-of-the-art approaches. To better address the tradeoff between performance and complexity, we first suggest a novel method to reduce the number of matrix inversions required and hence, to reduce the implementation complexity without any degradation in performance. We also introduce a novel low complexity scheme termed Quick SPILS (QSPILS) in which we lose a little in detection reliability, but significantly reduce the implementation complexity. Index Terms-Digital communications,

Published in:

Communications, IEEE Transactions on  (Volume:62 ,  Issue: 8 )