Telecommunications – Receiver or analog modulated signal frequency converter – Modulation distortion or cross talk correction or elimination
Reexamination Certificate
2006-11-28
2009-12-29
Le, Lana N (Department: 2614)
Telecommunications
Receiver or analog modulated signal frequency converter
Modulation distortion or cross talk correction or elimination
C455S296000, C455S067110, C455S226100, C375S346000, C375S324000, C375S349000, C381S071100
Reexamination Certificate
active
07640000
ABSTRACT:
The present invention is related to a partially overlapped single-carrier crosstalk signal cancellation method and an apparatus using the same. For this purpose, the present invention provides a crosstalk canceller including a pre-processor for frequency down-shifting an input signal, a crosstalk signal cancellation module for canceling the crosstalk signal by dividing the input signal by an interpolation ratio, a post-processor for converting an output of the crosstalk signal cancellation modulation into a passband signal, and an error feedback processor for performing a decimation operation on a residual crosstalk signal and feeding backing the decimated residual crosstalk signal to the crosstalk signal cancellation module. In addition, the present invention provides a crosstalk signal cancellation method for performing interpolation and filtering operations by frequency down-shifting an input signal including a crosstalk signal to a baseband and decimating a residual crosstalk signal by frequency-shifting to an original signal frequency.
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Minho Cheong et al.; “Computationally Efficient Cancellation of Partially-overlapped Crosstalk in Digital Subscriber Lines”; IEEE GLOBECOM 2005 proceeding; St. Lousi, Missouri, USA; Nov. 28-Dec. 2, 2005.
Cheong Min-Ho
Lee Yong-Hwan
Park Hyeong-Jun
Electronics and Telecommunications Research Institute
Le Lana N
Lowe Hauptman & Ham & Berner, LLP
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