Variable rate modulator

Details Variable rate modulator Variable rate modulator

1997-10-09

2000-11-07

Luther, William A.

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

364723, H04L 700

Patent

active

061447129

ABSTRACT:
Digital data signals at a variable input frequency are converted by a numerically controlled oscillator and an interpolator to a signal at a fixed output sampling frequency. The conversion of the variable input frequency to the fixed output sampling frequency may be by a factor other than an integer. The interpolated digital data signals at the fixed output sampling frequency are then modulated into a pair of trigonometric signals at a programmable carrier frequency, one signal having a cosine function and the other signal having a sine function. The modulated signals at the fixed output sampling frequency are then combined to create a modulated signal at a carrier frequency determined by the frequency of the sine and cosine signals. The modulated signal is sampled at the fixed output sampling frequency and converted to a corresponding analog signal using a digital-to-analog converter.

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H. Samueli, T. Lin, R. Hawley, and S. Olafson, "VSLI Architectures For A High-Speed Tunable Digital Modulator/Demodulator/Bandpass-Filter Chip Set", Integrated Circuits and Systems Laboratory Electrical Engineering Department University of California, Los Angeles (ISCAS'92). (3 pages).

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