Frequency-Domain ICI Estimation, Shortening, and Cancellation in OFDM Receivers

Orthogonal frequency division multiplexing (OFDM) communication systems encounter performance limitations due to time-varying channels common in wireless applications. The channel variations introduce intercarrier interference (ICI) in the received signal. To compensate, groups of adjacent OFDM carriers can be processed to cancel the interference. This paper considers a two-stage ICI cancellation technique. In the first stage, linear preprocessing compresses the effective ICI response. The second stage generates an MMSE estimate of the transmitted data. Simulation results for a DVB-T receiver using this technique show that frequency domain ICI response shortening performs best when combined with the receiver channel estimator.