Quadrature amplitude modulation system with compensation for tra

Details Quadrature amplitude modulation system with compensation for tra Quadrature amplitude modulation system with compensation for tra

1992-07-01

1993-08-17

Grimm, Siegfried H.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

375 39, 375 57, 375 60, 375 67, H04L 2736

Patent

active

052372928

ABSTRACT:
Digital signals are converted to phase and amplitude altered, periodic, analog signals and emplaced on an output link. The system is adaptive and includes a plurality of simple quadrature phase shift keying modulators, each modulator having a plurality of controlling digital inputs, the states of which determine which of a plurality of phase displaced signals will be outputted. A local oscillator provides a periodic sinusoidal signal to each QPSK modulator. Summing circuits combine the outputs of the modulators so as to produce a constellation of phase and amplitude-displaced output sinusoidal signals. A processor/mapper combination enables conversion of a first set of digital inputs to a different set of digital outputs in accordance with a control input. Thus, the processor enables the alteration of the constellation of outputs in accordance with a control input, which may be indicative of the condition of a transmission facility.

REFERENCES:
patent: 4039961 (1977-08-01), Ishio et al.
patent: 4168397 (1979-09-01), Bradley
patent: 4464767 (1984-08-01), Bremer
patent: 4571549 (1986-02-01), Lods et al.
patent: 4804931 (1989-02-01), Hulick
patent: 4930141 (1990-05-01), Ohmagari
patent: 4999590 (1991-03-01), Verdot

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