Pulse or digital communications – Repeaters – Including pulse regeneration or conversion
Reexamination Certificate
2003-12-30
2010-10-05
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Repeaters
Including pulse regeneration or conversion
C375S211000, C375S215000, C455S011100, C455S013200
Reexamination Certificate
active
07809048
ABSTRACT:
A repeater and method for an ATSC terrestrial digital TV broadcasting service. The on-channel repeater includes: a receiving unit for receiving a Radio Frequency (RF) broadcast signal from a main transmitter; a frequency downlink converting unit for converting the received RF broadcast signal into an intermediate frequency (IF) signal; a demodulating unit for converting the converted IF signal into a baseband signal; an equalizing unit for removing noise and multi-path signals generated from the converted baseband signal; a modulating unit for converting the baseband signal into an IF signal; a frequency uplink converting unit for converting the IF signal into a RF broadcast signal; a high power amplifying unit for amplifying and repeating the converted RF broadcast signal; a transmitting unit for transmitting the RF broadcast signal outputted from the high power amplifying unit; and a signal synchronizing unit for generating the first reference frequency, and generating the second reference frequency based on the first reference frequency such that the transmission/reception signal are frequency-and-phase synchronized.
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Khalil Salehian, et al., “On-Channel Repeater for Digital Television Broadcasting Service”, IEEE Transactions on Broadcasting, vol. 48, No. 2, Jun. 2002 (pp. 97-102).
Eum Ho-Min
Kim Seung-Won
Lee Soo-In
Lee Yong-Tae
Park Sung-Ik
Blakely & Sokoloff, Taylor & Zafman
Electronics and Telecommunications Research Institute
Lam Kenneth
Liu Shuwang
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