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

Abstract:

Orthogonal frequency-division multiplexing (OFDM) is a digital communications scheme with applications ranging from broadband internet access to 4G mobile communications. In this work, we present a new technique for dealing with inter-carrier interference (ICI) in OFDM systems, that formulates the decoding as an Integer Least Squares (ILS) problem, and extends previous results on a probabilistic approach to ILS-based decoding. In particular, we show it can be used to derive output log-likelihood ratios (LLRs) for LDPC-based channel decoding. The proposed scheme is shown to handle very high Doppler spreads, and compares favorably with state-of-the-art schemes for both coded and uncoded systems. Last, we will propose several computational approaches for lowering the computational complexity, and discuss the trade-off between lowering the computational complexity and decoding accuracy.

* M.Sc. research  advised by Dr. Yosi Keller and Dr. Itsik Bergel.