FFT-based equalizer with Doppler compensation for OFDM systems in time-variant multipath channels
Publication by
Nasimi Eldarov,
Thorsten Herfet
Published in 2014 IEEE International Conference on Consumer Electronics (ICCE), 2014
Published in 2014 IEEE International Conference on Consumer Electronics (ICCE), 2014
Abstract:
In Orthogonal Frequency Division Multiplexing (OFDM) mobile communication systems time-varying channels cause an inter-carrier interference (ICI) and degrade the performance due to the frequency orthogonality loss. Doppler shift compensation or equalization is very complex and often prohibitive in consumer receiver equipment. We propose a Doppler effect compensation / equalization technique for these kinds of scenarios. Using this technique we can compensate fast time-varying channels perfectly within an OFDM symbol with uniform Doppler shift and perfect channel knowledge. The computational complexity of the technique is the same as of FFT (N log(N)).