Programmable transmitter baseband equalizer

Details Programmable transmitter baseband equalizer Programmable transmitter baseband equalizer

1999-10-20

2000-10-24

Vo, Don N.

Pulse or digital communications

Equalizers

Automatic

375235, H03H 730, H03H 740, H03H 5159

Patent

active

06137833&

ABSTRACT:
A transversal filter equalizer comprising a programmable transmitter baseband equalizer for use in high rate digital transmitters. The programmable transmitter baseband equalizer processes digital data using a 1/2-symbol spaced transversal filter to produce I and Q baseband signals. The 1/2-symbol spaced transversal filter comprises I and Q n-bit wide shift register stages having alternate pairs of I and Q shift register stages driven by opposite phases of an input data clock, multiplying digital-to-analog converters driven by two direct tap weights and two cross tap weights, and I and Q combiners for generating I and Q baseband signals. The I and Q baseband signals are fed to a quadrature modulator that produces the desired constellation.

REFERENCES:
patent: 4613976 (1986-09-01), Sewerinson et al.
patent: 5157693 (1992-10-01), Lemersal, Jr. et al.
patent: 5534828 (1996-07-01), Okada et al.

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