The OFDM demodulator is a complex system composed of many interacting components. The compensation of the delay introduced by the channel is achieved in three stages: coarse block synchronization for pre-FFT removal of the cyclic prefix, post-FFT fine block synchronization, and equalization. Solutions currently proposed in the literature for the cascade of pre-FFT block synchronization and post-FFT fine block synchronization introduce an additional time-varying delay, which can compromise equalizer's performance. Starting from this observation, a novel approach to post-FFT block synchronization is presented. The proposed approach has a major impact on the subsequent carrier phase tracking, thus motivating the design also of a new carrier phase tracking algorithm. The carrier phase tracking method proposed in this work is based on continual pilot tones, which are present in the DVB-T standard. Our simulations show that the proposed receiver architecture allows for a major performance improvement compared to classic systems.

A new approach to post-FFT synchronization for DVB-T receivers

BREGNI, STEFANO;MAGARINI, MAURIZIO;SPALVIERI, ARNALDO
2016-01-01

Abstract

The OFDM demodulator is a complex system composed of many interacting components. The compensation of the delay introduced by the channel is achieved in three stages: coarse block synchronization for pre-FFT removal of the cyclic prefix, post-FFT fine block synchronization, and equalization. Solutions currently proposed in the literature for the cascade of pre-FFT block synchronization and post-FFT fine block synchronization introduce an additional time-varying delay, which can compromise equalizer's performance. Starting from this observation, a novel approach to post-FFT block synchronization is presented. The proposed approach has a major impact on the subsequent carrier phase tracking, thus motivating the design also of a new carrier phase tracking algorithm. The carrier phase tracking method proposed in this work is based on continual pilot tones, which are present in the DVB-T standard. Our simulations show that the proposed receiver architecture allows for a major performance improvement compared to classic systems.
2016
2016 8th IEEE Latin-American Conference on Communications, LATINCOM 2016
9781509051373
9781509051373
digital video broadcasting; OFDM; phase synchronization; wireless communication; Computer Networks and Communications
File in questo prodotto:
File Dimensione Formato  
07811584.pdf

Accesso riservato

: Publisher’s version
Dimensione 613.29 kB
Formato Adobe PDF
613.29 kB Adobe PDF   Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1013029
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 5
  • ???jsp.display-item.citation.isi??? 1
social impact