Analog-to-digital converter for stepped square QAM demodulators

Details Analog-to-digital converter for stepped square QAM demodulators Analog-to-digital converter for stepped square QAM demodulators

1988-10-12

1990-03-27

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

329304, H04L 2302

Patent

active

049127284

ABSTRACT:
An analog-to-digital converter for use with a stepped square 2.sup.2n -QAM demodulator comprises a first group of (2.sup.n+1 -1) comparators for detecting signal points of a demodulated signal of a stepped square QAM system which are located within a 2.sup.n .times.2.sup.n square of the signal constellation of the stepped square QAM system, and a second group of four comparators for detecting signal points located outside of the square. A first logic circuit is provided to convert the outputs of the comparators of the first group to a first multibit digital signal representative of the signal points located within the square, and a second logic circuit is provided for converting the outputs of the comparators of the second group to a second multibit digital signal representative of the signal points located outside of the square.

REFERENCES:
patent: 4554671 (1985-11-01), Collins
patent: 4571550 (1986-02-01), Head

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