ETD system

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Tesi etd-01212008-181611


Thesis type
Tesi di laurea specialistica
Author
FANCIULLACCI, CLAUDIO
URN
etd-01212008-181611
Title
Underwater Covert Acoustic Communications Using Multi-Band OFDM
Struttura
INGEGNERIA
Corso di studi
INGEGNERIA DELLE TELECOMUNICAZIONI
Commissione
Relatore Ing. Moretti, Marco
Relatore Prof. Leus, Geert
Relatore Prof. Reggiannini, Ruggero
Parole chiave
  • OFDM
  • Acoustic
  • Covert
  • Multi-Band
  • Underwater
Data inizio appello
18/02/2008;
Consultabilità
parziale
Data di rilascio
18/02/2048
Riassunto analitico
The goal of the project UCAC is to investigate digital communications in underwater acoustic channel, to develop and compare algorithms which meet requirements of covertness and efficiency and to demonstrate the feasibility of basic communication. The specific task is to develop an OFDM approach in this ostile communication scenario. Indeed, the underwater acoustic channel presents specific impairments that makes implementation of OFDM more challenging, with respect to the wireless communications. The present work relies on a transmitter architecture previously defined by TNO, that imposed fixed constraints on channel coding and interleaving, as well as data rate and transmitted streams. Thus, our goal was to concentrate on the transmitter and receiver implementation of the OFDM modulation and demodulation, respectively. Specifically, we considered a multi-band OFDM system, analyzing algorithms for equalization and channel estimation tested both by simulations and by real field data, obtained in the second sea trial of September 2007
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