ICI reduction method for OFDM systems

Orthogonal Frequency Division Multiplexing (OFDM) has an increased symbol duration which makes it robust against Inter-Symbol-Interference (ISI). However, the longer symbol duration increases the Inter-CarrierInterference (ICI) caused by Doppler spread in time variant channels. One method to combat the performance degradation due to ICI is to linearly approximate the channel variation during one OFDM symbol and create a channel matrix which can be used for ICI cancellation. This approximation is applicable if the Doppler spread is much smaller than the carrier spacing, which is usually the case. There are various possibilities for constructing a linearized model for the channel matrix. In our paper, we propose a new model which outperforms the algorithms published in earlier papers. We investigate the effects of ICI on the new OFDM-based digital radio standard DRM and show that our proposed algorithm can significantly reduce the performance degradation caused by ICI.