Methods and apparatus for adaptive PCM level estimation and...

Details Methods and apparatus for adaptive PCM level estimation and... Methods and apparatus for adaptive PCM level estimation and...

2007-04-10

2007-04-10

Bayard, Emmanuel (Department: 2611)

Pulse or digital communications

Pulse code modulation

C375S222000, C370S252000

Reexamination Certificate

active

10692619

ABSTRACT:
Systems compensate for the presence of digital impairments using adaptive constellation techniques. Sample magnitudes are estimated from received samples transmitted during a training period using an algorithm based on minimizing the sum of squares of the estimated errors, afterwhich a suitable constellation is derived. In one embodiment, an optimum least-squares algorithm is employed. In an alternate embodiment, a least mean squares (LMS) or normalized LMS algorithm is performed.

REFERENCES:
patent: 4730312 (1988-03-01), Johnson et al.
patent: 5048054 (1991-09-01), Eyuboglu et al.
patent: 5325425 (1994-06-01), Novas et al.
patent: 5398234 (1995-03-01), O'Connell et al.
patent: 5495526 (1996-02-01), Cesaro et al.
patent: 5506956 (1996-04-01), Cohen
patent: 5509036 (1996-04-01), Nakata
patent: 5535244 (1996-07-01), Nakatsu et al.
patent: 5541967 (1996-07-01), Gluska et al.
patent: 5590161 (1996-12-01), Meyn et al.
patent: 5598435 (1997-01-01), Williams
patent: 5623516 (1997-04-01), Brownlie et al.
patent: 5687199 (1997-11-01), Dupuy
patent: 5729226 (1998-03-01), Betts et al.
patent: 5754594 (1998-05-01), Betts et al.
patent: 5761247 (1998-06-01), Betts et al.
patent: 5764694 (1998-06-01), Rahamim et al.
patent: 5784405 (1998-07-01), Betts et al.
patent: 5787118 (1998-07-01), Ueda
patent: 5812075 (1998-09-01), Betts et al.
patent: 5822359 (1998-10-01), Bruckert et al.
patent: 5822371 (1998-10-01), Goldstein et al.
patent: 5825816 (1998-10-01), Cole et al.
patent: 5825823 (1998-10-01), Goldstein et al.
patent: 5838724 (1998-11-01), Cole et al.
patent: 5875229 (1999-02-01), Eyuboglu et al.
patent: 5949819 (1999-09-01), Bjarnason et al.
patent: 6023493 (2000-02-01), Olafsson
patent: 6067319 (2000-05-01), Copeland
patent: 6081567 (2000-06-01), Olafsson
patent: 6122609 (2000-09-01), Scalart et al.
patent: 6128276 (2000-10-01), Agee
patent: 6178200 (2001-01-01), Okunev et al.
patent: 6185195 (2001-02-01), Leung
patent: 6269131 (2001-07-01), Gothe et al.
patent: 6317419 (2001-11-01), Olafsson et al.
patent: 6381266 (2002-04-01), Zhang et al.
patent: 6721279 (2004-04-01), Zhang et al.
patent: 2003/0087659 (2003-05-01), Wang
patent: 2006/0109894 (2006-05-01), Liang et al.
Telecommunication Standardization Sector of ITU; ITU-T Recommendation V.90 (Sep. 1998) “A Digital Modem and Analogue Modem Pair For Use On The Public Switched Telephone Network (PSTN) At Data Signalling Rates Of Up To 33 600 bit/s Upstream” Series V: Data Communication Over the Telephone Network, Simultaneous Transmission of Data and Other Signals; the whole document.

Affiliated with

Also associated with

Rating

Methods and apparatus for adaptive PCM level estimation and... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Methods and apparatus for adaptive PCM level estimation and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods and apparatus for adaptive PCM level estimation and... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3796202