Amplitude and phase error normalization of subcarrier generator

Details Amplitude and phase error normalization of subcarrier generator Amplitude and phase error normalization of subcarrier generator

1995-02-16

1996-02-06

Mis, David

Modulators

Phase shift keying modulator or quadrature amplitude modulator

375296, 379 56, 455 571, 455 63, H03C 300, H04L 2700

Patent

active

054898790

ABSTRACT:
A subcarrier signal generator includes a finite impulse response (FIR) filter responsive to selected FIR coefficients. A first set of FIR coefficients represents an ideal subcarrier shape and center frequency. A calibration step monitors the resulting subcarrier signal and produces a new set of FIR coefficients corresponding generally to the ideal subcarrier signal shape and center frequency, but predistorted according to the compliment of error detected in the actual subcarrier signal. By then loading the new set of FIR coefficients and operating the subcarrier generator, frequency-dependent distortions in the output stage of the subcarrier generator cancel predistortion reflected in the new FIR coefficients. As a result, a high quality subcarrier signal results without use of expensive output stage devices in the subcarrier signal generator.

REFERENCES:
patent: 5164678 (1992-11-01), Puri et al.

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