Method and apparatus for adaptively providing precoding and pree

Details Method and apparatus for adaptively providing precoding and pree Method and apparatus for adaptively providing precoding and pree

1993-10-22

1995-03-07

Chin, Stephen

Pulse or digital communications

Transmitters

Antinoise or distortion

455 43, H04L 2549

Patent

active

053965191

ABSTRACT:
The relative amounts of additive white noise and proportional noise in a communication channel are compensated for by providing adaptive precoding and preemphasis to signal point signals. The amounts of precoding and preemphasis are controlled using scalars to modify the magnitudes of the precoding and preemphasis signals that are combined with the signal point signals. The values of the scalars are transferred between the transmitter and receiver, and the values can be changed without losing synchronization between the transmitter and receiver.

REFERENCES:
patent: 5095497 (1992-03-01), Aman et al.
patent: 5162812 (1992-11-01), Aman et al.
patent: 5195107 (1993-03-01), Wei
patent: 5249200 (1993-09-01), Chen et al.
Telecommunications Industry Association, Paper TR-30.1/93-0623, "ISI Coder-Combined Coding & Precoding", by Rajiv Laroia, AT&T, Baltimore, Md., 14-18 Jun., 1993.
International Telecommunications Union, Telecommunications Standards Sector (ITU-TSS), Period 1993-96, "4D codes for V.fast", Motorola Information Systems, Rockville, Md., May 12-14, 1993.
Telecommunications Industry Association, Paper TR-30, 1/93-04-14, "Implementation of precoding in V.fast" by Vedat Eyuboglu, et al., General DataComm Inc., Motorola Codex, Rockwell International, Atlanta, Ga., 15 Apr. 1993.
CCITT, Paper 989-1992, "Trellis precoding vs. linear pre-emphasis: test results", Motorola Information Systems, Baltimore, Md., Jul. 31-Aug. 2, 1991.

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