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Performance Improvement of Frequency Synchronization in ATSC DTV System using Signal Power at Both Edges of Spectrum  

Song Hyun Keun (The Graduate School of IT & Telecommunication, INHA Univ.)
Lee Joo Hyung (The Graduate School of IT & Telecommunication, INHA Univ.)
Kim Jae Moung (The Graduate School of IT & Telecommunication, INHA Univ.)
Eum Ho Min (Electronics and Telecommunications Research Institute)
Kim Seung Won (Electronics and Telecommunications Research Institute)
Publication Information
Journal of Broadcast Engineering / v.10, no.1, 2005 , pp. 31-42 More about this Journal
Abstract
ATSC DTV system uses FPLL block for acquiring the frequency synchronization. Because the FPLL uses only the pilot signal, the frequency convergence range becomes narrower and it takes a more time to acquire the frequency synchronization as the pilot is distorted. And the spectrum shape around the pilot makes an asymmetric convergence range between the positive frequency offset and the negative frequency offset. This paper proposes the algorithm that requires the Installation of the fitters at the both edges of a VSB spectrum and uses the signal power that passes these filters. The proposed algorithm complements the problems of the asymmetric convergence range and overcomes the performance degradation due to the distortion of a pilot level.
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