Interference Cancellation Techniques for Digital On-Channel Repeaters in T-DMB System

Digital on-channel repeater (DOCR) is regarded as a desirable solution to effectively build a wide-area network of mobile terrestrial-digital multimedia broadcasting (T-DMB) services. On the other hand, the DOCR mainly suffers from interference effects caused by a strong feedback signal and a time-v...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on broadcasting 2011-03, Vol.57 (1), p.46-56
Main Authors: CHOI, Jin-Yong, HUR, Min-Sung, SUH, Young-Woo, BAEK, Jong-Seob, LEE, Yong-Tae, SEO, Jong-Soo
Format: Article
Language:English
Subjects:
Applied sciences
Broadcasting. Videocommunications. Audiovisual
Cancellation
Channel estimation
Channels
Delay
Detection, estimation, filtering, equalization, prediction
Digital
Digital on-channel repeater
equalization
Equalizers
Equipments and installations
Exact sciences and technology
Feedback
Information, signal and communications theory
Interference
Long distance private networks
Networks and services in france and abroad
OFDM
Phase distortion
Radiocommunications
Radiorelay links
Repeaters
Signal and communications theory
signal cancellation
Signal, noise
single frequency network
Telecommunications
Telecommunications and information theory
Teleprocessing networks. Isdn
Television
Transmitters
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Digital on-channel repeater (DOCR) is regarded as a desirable solution to effectively build a wide-area network of mobile terrestrial-digital multimedia broadcasting (T-DMB) services. On the other hand, the DOCR mainly suffers from interference effects caused by a strong feedback signal and a time-varying channel dispersion. In this paper, we propose a novel DOCR for use in the T-DMB system in order to mitigate effectively both interference effects. First, we present an energy equalizer using the scarce pilot structure of T-DMB system to estimate a channel state information on every OFDM symbol. An optimum frequency domain channel estimation (FDCE) algorithm is then derived for the energy equalizer. In addition, a moving average filter (MAF) is employed to mitigate the phase distortion of truncated equalizer coefficients in deep null channel. Finally, in the performance evaluations, it is shown that the optimum FDCE outperforms a perfect FDCE. It is also shown that the DOCR equipped with the proposed interference cancellation can solve the problems caused by a limited channel information update, a phase distortion of the equalizer, and a residual feedback signal.
ISSN:0018-9316
1557-9611
DOI:10.1109/TBC.2010.2094314