Channel equalizing and carrier recovery system for home...

Pulse or digital communications – Equalizers – Automatic

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C375S232000, C375S350000, C375S346000, C708S322000, C708S323000

Reexamination Certificate

active

10413663

ABSTRACT:
A channel equalizing and carrier recovery system for home phoneline networking alliance (HomePNA) receiver and method thereof are provided. The channel equalizing system includes a frequency diverse quadrature amplitude modulation (FD-QAM) equalizer and a quadrature amplitude modulation (QAM) equalizer. The FD-QAM equalizer receives an FD-QAM signal, determines FD-QAM tap coefficients, and equalizes the FD-QAM signal using the FD-QAM tap coefficients. The QAM equalizer receives a QAM signal, determines QAM tap coefficients, and equalizes the QAM signal using the QAM tap coefficients. The QAM equalizer receives the FD-QAM signal and determines the QAM tap coefficients during a predetermined header period. The carrier recovery circuit includes a phase detector, a loop filter, and a numerically controlled oscillator (NCO). The phase detector uses a phase difference between a reception symbol and a decision signal of the reception symbol as an instantaneous phase difference when the reception symbol is a data symbol of an FD-QAM signal or a symbol of a QAM signal, uses “0” as the instantaneous phase difference when the reception symbol is a zero symbol of the FD-QAM signal, averages instantaneous phase differences during a predetermined period or time, and outputs the result of averaging. The loop filter filters the output signal of the phase detector. The NCO generates an oscillation signal having a variable phase in response to an output signal of the loop filter so that a phase error of a reception signal can be controlled.

REFERENCES:
patent: 5799037 (1998-08-01), Strolle et al.
patent: 6327311 (2001-12-01), Ojard
patent: 6441683 (2002-08-01), Hwang et al.
patent: 6907086 (2005-06-01), Ojard
patent: 2002/0021165 (2002-02-01), Hwang et al.
patent: 2003/0156592 (2003-08-01), Ojard et al.
patent: 2003/0156656 (2003-08-01), Ojard et al.
patent: 2003/0206559 (2003-11-01), Trachewsky et al.
patent: 6-90306 (1994-03-01), None
patent: 9-275426 (1997-10-01), None
patent: 2000-59455 (2000-02-01), None
patent: 1997-0024758 (1997-05-01), None
patent: 1999-0066518 (1999-08-01), None
Bisaglia, Paola, et al.,Receiver Architectures for HomePNA 2.0, Hewlett Packard Laboratories, Bristol, U.K., Oct. 17, 2001.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Channel equalizing and carrier recovery system for home... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Channel equalizing and carrier recovery system for home..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Channel equalizing and carrier recovery system for home... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3806423

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.