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Transactions: WSEAS TRANSACTIONS ON COMMUNICATIONS
Transactions ID Number: 53-362
Full Name: Chang Liu
Position: Ph.D. Candidate
Age: ON
Sex: Male
Address: No.2006 Xiyuan Road, Chengdu
Country: CHINA
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E-mail address: chaneaaa@163.com
Other E-mails: liupoweraaa@sohu.com
Title of the Paper: an optimal gain control scheme for digital on-channel repeater with feedback interference canceller in digital terrestrial television broadcasting networks
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Number of paper pages: 10
Abstract: In this paper, a new gain control scheme is proposed for a digital on-channel repeater (DOCR) with a feedback interference canceller (FIC) in Digital Terrestrial Television Broadcasting (DTTB) networks. In the proposed scheme, a variable attenuator is placed behind the amplifier of the DOCR and the least mean square (LMS) adaptive algorithm is implemented in the FIC to estimate the feedback channel. The proposed scheme consists of two stages. In the first stage, the variable attenuator is fixed on a high attenuation level for a sufficient time with the purpose of avoiding oscillation at startup of the DOCR. In the second stage, based on the non-oscillation condition derived in Section II, the attenuation level can be decreased at intervals until the aimed gain is approached. Simulations show that the proposed scheme increases the convergence speed of the adaptive algorithm and saves the adjusting time of approaching the aimed gain compared with the conventional gai!
n control scheme.
Keywords: Digital terrestrial television broadcasting (DTTB), digital on-channel repeater (DOCR), feedback interference canceller (FIC), oscillation,
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