OcrV1, Main, Exploration, bibRecord, 000564

Feedback Cancellation for T-DMB Repeaters Based on Frequency-Domain Channel Estimation

Identifieur interne : 000564 ( Main/Exploration ); précédent : 000563; suivant : 000565

Feedback Cancellation for T-DMB Repeaters Based on Frequency-Domain Channel Estimation

Auteurs : Young-Jun Lee [Corée du Sud] ; Ji-Bong Lee [Corée du Sud] ; Sung Ik Park [Corée du Sud] ; Yong-Tae Lee [Corée du Sud] ; HEUNG MOOK KIM [Corée du Sud] ; Hyoung-Nam Kim [Corée du Sud]

Source :

IEEE transactions on broadcasting [ 0018-9316 ] ; 2011.

RBID : Pascal:11-0155829

Descripteurs français

Pascal (Inist)
- Réduction bruit, Faisceau hertzien, Télévision numérique, Répéteur, Méthode domaine fréquence, Estimation paramètre, Estimation signal, Estimation fréquence, Estimation canal, Reconnaissance optique caractère, Emetteur, Antenne, Multiplexage fréquence orthogonal, Taux convergence, Poursuite cible, Robustesse, Canal variant dans temps, Mise à jour, Simulation, Méthode partition, Traitement signal, Transmission numérique, Reconnaissance forme.
Wicri :
- topic : Simulation.

English descriptors

KwdEn :
- Antenna, Channel estimation, Convergence rate, Digital television, Digital transmission, Frequency domain method, Frequency estimation, Noise reduction, Optical character recognition, Orthogonal frequency division multiplexing, Parameter estimation, Partition method, Pattern recognition, Radio link, Repeater, Robustness, Signal estimation, Signal processing, Simulation, Target tracking, Time variable channel, Transmitter, Updating.

Abstract

This paper presents a novel feedback canceller for a terrestrial digital multimedia broadcasting (T-DMB) on-channel repeater (OCR). There is a crucial requirement for an OCR that the isolation between the transmitter and the receiver antennas should be sufficiently secured to prevent unwanted oscillation. The required isolation, however, may not be satisfied by some physical or technical limitations. In order to overcome these obstacles, undesired feedback signals have been usually reduced by feedback cancellation techniques based on pilot-aided frequency-domain channel estimation (FDCE). In case of the T-DMB system, however, there are no pilot symbols except for the phase reference symbols (PRSs), which are transmitted only once every 76 OFDM symbols. Consequently, the convergence speed and the tracking capability of the FDCE-type feedback cancellers may not meet the required robustness in coping with dynamic feedback channels. To improve the immunity to time-varying channels, we increase the usable number of updates in our feedback canceller, where the PRS is divided into several sub-PRSs during the PRS period and pseudo pilots are generated by decision-directed estimation in the data-symbol duration. Simulation results show that the proposed methods do improve the convergence speed and the tracking capability of the conventional method in both static and dynamic feedback channels.

Affiliations:

Corée du Sud

Links toward previous steps (curation, corpus...)

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Le document en format XML

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<term>Méthode domaine fréquence</term>
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<term>Estimation canal</term>
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<term>Emetteur</term>
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<front><div type="abstract" xml:lang="en">This paper presents a novel feedback canceller for a terrestrial digital multimedia broadcasting (T-DMB) on-channel repeater (OCR). There is a crucial requirement for an OCR that the isolation between the transmitter and the receiver antennas should be sufficiently secured to prevent unwanted oscillation. The required isolation, however, may not be satisfied by some physical or technical limitations. In order to overcome these obstacles, undesired feedback signals have been usually reduced by feedback cancellation techniques based on pilot-aided frequency-domain channel estimation (FDCE). In case of the T-DMB system, however, there are no pilot symbols except for the phase reference symbols (PRSs), which are transmitted only once every 76 OFDM symbols. Consequently, the convergence speed and the tracking capability of the FDCE-type feedback cancellers may not meet the required robustness in coping with dynamic feedback channels. To improve the immunity to time-varying channels, we increase the usable number of updates in our feedback canceller, where the PRS is divided into several sub-PRSs during the PRS period and pseudo pilots are generated by decision-directed estimation in the data-symbol duration. Simulation results show that the proposed methods do improve the convergence speed and the tracking capability of the conventional method in both static and dynamic feedback channels.</div>
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Feedback Cancellation for T-DMB Repeaters Based on Frequency-Domain Channel Estimation

Feedback Cancellation for T-DMB Repeaters Based on Frequency-Domain Channel Estimation

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

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