Pulse or digital communications – Equalizers – Automatic
Reexamination Certificate
2005-05-12
2008-11-04
Ghayour, Mohammad (Department: 2611)
Pulse or digital communications
Equalizers
Automatic
C375S233000, C375S326000, C375S344000, C375S346000
Reexamination Certificate
active
07447262
ABSTRACT:
This invention presents a novel receiver architecture for full-duplex multi-level PAM systems. The receiver employs an Analog-to-Digital Converter (ADC) that has a sample rate flexibly specified as (Ns+1)/Nsbaud rate where Nsis an integer equal or greater than 1. A fractional-spaced echo canceller is used to cancel the echo at the ADC output. The use of a fractional sampling rate higher than the baud rate also enables the timing recovery function be implemented in the digital domain and hence eliminates the need of using the complex analog phase selection circuit. The receiver is also capable of fast, blind start-up by use of a decision feedback equalizer with unity main tap and a soft level slicer. The timing phase can be optimally located using a derivative channel estimator. Once the “eye-open” condition is achieved, the channel equalization is switched to the use of linear equalizer coupled with an error feedback equalizer to alleviate the error propagation problem associated with the decision feedback equalizer.
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Ko Jui-Tai
Tsai Kun-Ying
Tseng Ching-Yih
Yen Ming-Chou
Corless Peter F.
Edwards Angell Palmer & & Dodge LLP
Ghayour Mohammad
Jensen Steven M.
RDC Semiconductor Co., Ltd.
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