Large size FFTs over time‐varying channels. Issue 15 (1st July 2014)

• Record Type: Journal Article
• Authors: Montalban, J.; Velez, M.; Angulo, I.; Angueira, P.; Wu, Y.
• Is Part Of: Electronics letters. Volume 50:Issue 15(2014)
• Page Start: 1102
• Page End: 1103
• Publication Date: 2014-07-01
• Subjects: fast Fourier transforms -- OFDM modulation -- intercarrier interference -- Doppler effect -- error correction -- channel estimation; large size FFT -- time‐varying channels -- orthogonal frequency division multiplexing signals -- fast Fourier transforms -- guard interval percentage -- data throughput -- inter‐carrier interference -- mobile services -- Doppler effect -- ICI -- error correction techniques -- channel estimation; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2014.1301
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : In orthogonal frequency division multiplexing (OFDM) signals, the usage of large size fast Fourier transforms (FFTs) reduces the guard interval percentage, and therefore increases the data throughput reducing the data overhead. In addition, for the same pilot pattern, the distance between adjacent pilots is smaller, which will improve the channel estimation. Nevertheless, up to now, they have not been considered for delivering mobile services as the inter‐carrier interference (ICI) due to the Doppler effect is very critical. The main objective is to show that taking advantage of the latest improvements in error correction techniques, it is feasible to use large size FFTs for time‐varying channels. Furthermore, there is also presented a theoretical estimation for quantifying the loss due to the ICI, and finally several simulation results that reinforce the idea that large OFDM symbols are suitable for mobile channels.