Method of differential encoding a precoded multiple modulus...

Details Method of differential encoding a precoded multiple modulus... Method of differential encoding a precoded multiple modulus...

2005-10-11

2005-10-11

Burd, Kevin (Department: 2631)

Pulse or digital communications

Transceivers

Modems

Reexamination Certificate

active

06954492

ABSTRACT:
A differential encoder is designed to correct for any phase invariance. Without differential encoding defined for the V.92 upstream, undetectable errors are possible in a modem due to an inversion in the upstream channel. Immunity to channel inversions is provided by differentially encoding a combined preceding and modulus conversion system. A frame of a constellations is attributed a sign and the frame and the sign are differentially encoded. The frame and the sign are differentially decoded after the multiple modulus decoder, ensuring phase shift immunity.

REFERENCES:
patent: 5555547 (1996-09-01), Lemaitre et al.
patent: 6084883 (2000-07-01), Norrell et al.
patent: 6343101 (2002-01-01), Dong et al.
patent: 6418170 (2002-07-01), Maurer et al.
patent: WO 9967890 (1999-12-01), None
“A Modem Operating At Data Signalling Rates Of Up To 33600 bit/s For Use On The General Switched Telephone Network And On Leased Point-to-Point 2-Wire Telephone-Type Circuits”, ITU-T V. 34, Feb. 1998, pp. i-72.
Richard Williams, “A Digital Modem And Analogue Modem Pair For Use On The Public Switched Telephone Network (PSTN) At Data Signalling Rates Of Up To 56000 Bit/s Downstream And Up To 336000 Bit/s Upstream”, V.90, May 6, 1998, pp. 1-50.
Richard Williams, “Differential Encoding For V.92 Upstream”, ITU Study Group 16, Apr. 25-28, 2000, pp. 1-3.
Dea-Young Kim, “180° Phase Invariance For Recommendation V.92”, TIA, Mar. 22, 2000, pp. 1-5.

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