Pulse or digital communications – Equalizers – Automatic
Reexamination Certificate
2005-02-15
2005-02-15
Corrielus, Jean B. (Department: 2637)
Pulse or digital communications
Equalizers
Automatic
C375S316000, C375S355000
Reexamination Certificate
active
06856648
ABSTRACT:
Equalizer updating and accurate sampling rate control in a DMT receiver are simultaneously performed using a known signal, such as a pilot tone. The known signal is separated into its real and imaginary components. The equalizer uses separate mechanisms to process the real and imaginary components. The real component is used to control sampling rate timing in the receiver. The imaginary component of the received signal is used in an equalization adaptation procedure, e.g., updating an equalizer coefficient value. In one example embodiment, the real component of the received signal is set to zero for purposes of equalization, and the unequalized, real component is used to recover/track sampling rate timing. Because the real component has not been equalized, simultaneous timing recovery/tracking and equalization is achieved. Only the imaginary component is equalized and used to update the equalizer coefficient value. Thereafter, the unequalized real component and the equalized imaginary component are combined. In another example embodiment, a real-valued equalizer coefficient is determined for the known signal. Both real and imaginary components of the known sigal are equalized with the real-valued equalizer coefficient. The so-equalized real component adapts to a normalized amplitude for the timing control signal which is desirable in certain timing control applications. The equalized real and imaginary components are combined. The equalizer coefficient is updated using only the imaginary component of the received signal.
REFERENCES:
patent: 4815103 (1989-03-01), Cupo et al.
patent: 4975927 (1990-12-01), Yoshida
patent: 5031197 (1991-07-01), Hespelt et al.
patent: 5200981 (1993-04-01), Carmon
patent: 5414732 (1995-05-01), Kaufmann
patent: 5642385 (1997-06-01), Alberty
patent: 5673293 (1997-09-01), Scarpa et al.
patent: 5694419 (1997-12-01), Lawrence et al.
patent: 5729173 (1998-03-01), Sato
patent: 5828954 (1998-10-01), Wang
patent: 5872815 (1999-02-01), Strolle et al.
patent: 5894334 (1999-04-01), Strolle et al.
patent: 6005893 (1999-12-01), Hyll
patent: 6088401 (2000-07-01), Saito
patent: 6219379 (2001-04-01), Ghosh
patent: 6252908 (2001-06-01), Tore
patent: 6259743 (2001-07-01), Garth
patent: 6496229 (2002-12-01), Limberg
patent: 6643321 (2003-11-01), Genossar et al.
patent: 6687292 (2004-02-01), Garcia
patent: 0 368 307 (1990-05-01), None
patent: 0 805 573 (1997-11-01), None
International Telecommunication Union, ITU-T, Telecommunication Standardization Sector of ITU, G.992.1 (6/99), Series G: Transmission Systems and Media, Digital Systems and Networks, Digital Transmission Systems—Digital Sections and Digital Line System—Access Networks.
Corrielus Jean B.
Nixon & Vanderhye P.C.
Telefonaktiebolaget LM Ericsson
LandOfFree
Method and apparatus for equalizer updating and sampling... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for equalizer updating and sampling..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for equalizer updating and sampling... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3502324