Precoding coefficient training in a V.34 modem

Details Precoding coefficient training in a V.34 modem Precoding coefficient training in a V.34 modem

1996-12-31

2000-10-17

Le, Amanda T.

Pulse or digital communications

Transceivers

Modems

375231, 375285, 375296, 375350, 708320, 708323, H04B 138

Patent

active

061342653

ABSTRACT:
A V.34 compliant modem uses a noise whitening filter to compensate for noise enhancement in an equalizer. The noise whitening filter uses a 3 tap FIR the response of which is determined by 3 coefficients. The coefficients are derived using a newly developed extension of the Levinson-Durbin algorithm to complex numbers. The coefficients thus derived are used to control the precoder as well as the noise whitening filter. The coefficients are also used to control precoding reconstruction after the decoder.

REFERENCES:
patent: 5283811 (1994-02-01), Chennakeshu et al.
patent: 5388124 (1995-02-01), Laroia et al.
patent: 5396519 (1995-03-01), Betts et al.
patent: 5615298 (1997-03-01), Chen
patent: 5693901 (1997-12-01), Matsunaga
International Telecommunications Union Telecommunications Standardization Sector Issued Recommendation V.34 entitled "A Modem Operating at Data Signaling 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" (originally adopted in 1994, and revised in early 1996).

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