Channel Estimation and ICI Cancellation for OFDM Systems in Doubly-Selective Channels

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Executive Summary

In Orthogonal Frequency Division Multiplexing (OFDM) systems, time- and frequency-selective (or doubly-selective) fading leads to the loss of subcarrier orthogonality and the occurrence of Inter-Carrier Interference (ICI), which increases an irreducible error floor in proportional to the normalized Doppler frequency offset. Channel Estimation (CE) in rapidly time-varying multi-path scenarios is critical for ICI cancellation and coherent demodulation. In this paper, the authors introduce an iterative CE scheme to estimate time-varying channel parameters and a low-complexity equalization method to cancel ICI and detect data.

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