Naslov
Self-recovering equalization in an OFDM system with cyclic prefix

Autori
Slišković, Maja

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the IASTED International Conference Signal and Image Processing / Hamza, M. H. - : International Association of Science and Technology for Development (IASTED), 2000, 285-288

Skup
IASTED International Conference Signal and Image Processing

Mjesto i datum
Las Vegas (NV), Sjedinjene Američke Države, 19.11.2000. - 23.11.2000

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
DSP applications in communications; OFDM; cyclic prefix; blind equalization

Sažetak
Orthogonal frequency division multiplexing (OFDM) is recently being used for high rate data transmission, both in wireless and in wired environment. Equalizer is very important part of any multicarrier system, especially when higher order constellations on individual subcarriers are used. Channel estimation is usually performed with the training sequence aided algorithms, and the equalizer is realized as an one-tap equalizer in a frequency domain. Changes of the channel transfer function may cause significant performance degradation if retraining is not applied. This paper proposes the use of the redundancy of the cyclic prefix to adapt coefficients of the equalizer. The cyclic prefix, originally used as a guard interval between succeeding symbols, is simply the insertion of last L symbol samples in front of the symbol, and it can be used as a redundant information from which equalizer coefficients can be estimated, without the need for the training sequence. For equalizer coefficient calculation, gradient algorithm is used.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

POVEZANOST RADA