Chapter: Analog and Digital
The OFDM receiver structure allows relatively straightforward signal processing to combat channel delay spreads. However, mobile reception leads to disadvantageous channel conditions, with both (frequency) dispersion and rapid variations of the channel with time. Doppler spread and the corresponding time variations are known to corrupt the orthogonality of the OFDM subcarrier waveforms. In such case, Intercarrier Interference (ICI) occurs because signal components from one subcarrier cause interference to neighboring subcarriers.
This spreadsheet allows you to interactively experiment with the effect of mobility. The channel model is Rayleigh fading with a U-shaped spectrum.
InterCarrier Interference for
PDF J.P.M.G. Linnartz, "Performance Analysis of Synchronous MC-CDMA in mobile Rayleigh channels with both Delay and Doppler spreads", IEEE VT, Vol. 50, No. 6, Nov. 2001, pp 1375-1387.