Method and apparatus for quadrature amplitude modulation of digi

Details Method and apparatus for quadrature amplitude modulation of digi Method and apparatus for quadrature amplitude modulation of digi

1991-02-15

1993-10-12

Kuntz, Curtis

Pulse or digital communications

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Testing

332103, H04L 512, H04L 2302, H04L 2720

Patent

active

052532712

ABSTRACT:
A transmitter using quadrature amplitude modulation is described which eliminates all microprocessors by using a finite state machine implementation. In particular, the transmitter and method eliminates the complex mathematics from the quadrature amplitude modulation involving the signal space mapping and modulation computations. The transmitter is particularly designed for use in an oil well logging application where the transmitter resides in the harsh downhole environment of an oil well. The transmitter not only reduces hardware cost and complexity, but also improves performance while reducing failures and development time.

REFERENCES:
patent: 3514750 (1970-05-01), Pritchett et al.
patent: 3665314 (1972-05-01), Leuthold
patent: 4646326 (1987-02-01), Backof, Jr. et al.
patent: 4736389 (1988-04-01), Debus, Jr. et al.
Kanno, Norio and Katsuyoshi Ito, "Fiber Optic Broadband Visual Signals Transport Employing High-Level QAM," IEEE Global Telecommunications Conference, 1987, vol. 3, of 3, IEEE, N.Y., 1987, pp. 11477-11484.

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