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Tesi etd-03192008-222619


Thesis type
Tesi di dottorato di ricerca
Author
CARTA, MICHELE
URN
etd-03192008-222619
Title
FREQUENCY RECOVERY AND RECEIVER DESIGN ISSUES IN FBMC WIRELESS SYSTEMS
Settore scientifico disciplinare
ING-INF/03
Corso di studi
INGEGNERIA DELL'INFORMAZIONE
Commissione
Relatore Prof. Mengali, Umberto
Relatore Prof. Reggiannini, Ruggero
Relatore Ing. Lottici, Vincenzo
Parole chiave
  • receiver design
  • FilterBank MultiCarrier (FBMC) modulation
  • doubly selective channels
  • Carrier Frequency Offset (CFO) recovery
  • TErrestrial Trunked RAdio (TETRA)
Data inizio appello
10/06/2008;
Consultabilità
completa
Riassunto analitico
This Ph.D. dissertation deals with one of the most prominent example of MC<br>modulation, Filter Bank MultiCarrier (FBMC) modulation, and aims at reporting<br>the main results of our research activity carried out over the last three years in<br>the field of FBMC wireless systems.<br><br>The first chapter introduces the basic concepts of wireless communication <br>channels and multicarrier modulation. In the first part, FBMC modulation is presented. <br>We provide a detailed description of the modulator and demodulator architecture which<br>are based on digital signal processing techniques. The last section is devoted to<br>an overview of the main physical aspects of the recent TEDS ETSI standard for<br>PMR/PAMR communications, which relies on the FBMC technique.<br><br>The core topic of the second chapter is carrier frequency offset recovery (CFO) for FBMC<br>transmission over time-frequency selective fading channels. After a brief statement <br>of the problem, we analyse three different frequency estimation algorithms<br>that arise from the maximum likelihood principle. Specifically the schemes <br>exhibit an open-loop structure, intended for burst transmissions, and are all based<br>on the use of known pilot symbols scattered across the transmitted burst. <br>Performance analysis quantifies the accuracy of the proposed algorithms in typical<br>mobile wireless scenarios, showing they outperform conventional NDA frequency<br>recovery even combined with a lower computational complexity.<br><br>The third chapter deals with receiver design issues for FBMC burst transmission over<br>doubly selective fading channels with emphasis on synchronization and channel <br>estimation aspects. Specifically, a ML-derived symbol timing recovery <br>algorithm is proposed that relies on the transmission of a short known preamble.<br>The carrier synchronization task is implicitly carried out by a properly <br>modified Bayesian channel estimation algorithm that exploits pilot symbols uniformly<br>spaced throughout the subcarriers. The proposed receiver architecture is thoroughly <br>discussed and the schemes are assessed, evaluating their impact on the<br>receiver performance in terms of FER in typical mobile wireless channel conditions.
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