O Analiză a Estimatorului Canalului OFDM

Autor/autori: Dr. ing. Dorina Dragomir, Drd. ing. Cristina - Gabriela Gheorghe

Rezumat: OFDM este o schema de modulatie digitala ce livreaza sistemelor de comunicatii de banda larga volume mari de date si imunitate la interferenta intersimbol si fading. Estimatorul de canal OFDM si egalizarea sunt probleme critice in dezvoltarea sistemului OFDM. Estimatorul de canal se bazeaza pe ipoteza sub-benzilor independente. Scopul acestui material este investigarea exhaustiva a schemelor de estimatie pentru a decide asupra profilului statistic al canalului

Cuvinte cheie: modulație digitală, zgomot, fading, multiplexare cu divizare ortogonală de frecvență, estimarea canalului.

Abstract: orthogonal frequency division multiplexing (OFDM) is a digital modulation scheme which serve broadband communications systems with high volume of data and robust immunity to intersymbol interference and fading. Channel estimation and equalization issue are critical for the design of the OFDM system. The channel estimation relies on the subchannels correlations even if the receiver considers the subchannels independently. It is the purpose of the present paper to investigate estimation schemes in order to decide the appropriate channel statistics.

Keywords: digital modulation, noise, fading, orthogonal frequency division multiplexing, channel estimation

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