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Journal Article Feedback Cancellation for T-DMB Repeaters Based on Frequency-Domain Channel Estimation
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Authors
Young-Jun Lee, Ji-Bong Lee, Sung Ik Park, Yong-Tae Lee, Heung Mook Kim, Hyoung-Nam Kim
Issue Date
2011-03
Citation
IEEE Transactions on Broadcasting, v.57, no.1, pp.114-120
ISSN
0018-9316
Publisher
IEEE
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.1109/TBC.2010.2086770
Project Code
10MR2900, Development of transmission efficiency enhancement technology for terrestrial DTV system, Heung Mook Kim
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. © 2006 IEEE.
KSP Keywords
Channel estimation(CE), Conventional methods, Digital multimedia broadcasting, Dynamic feedback, Feedback channel, Pilot symbols, Static and dynamic, Time-varying channels, convergence speed, feedback cancellation, feedback signal