Adaptive interference cancellation receiving system using...

Details Adaptive interference cancellation receiving system using... Adaptive interference cancellation receiving system using...

2006-02-14

2006-02-14

Shingleton, Michael B. (Department: 2817)

Demodulators

Frequency modulation demodulator

Having specific distortion, noise or other interference...

C327S105000, C327S107000, C375S376000

Reexamination Certificate

active

06998908

ABSTRACT:
An adaptive interference cancellation receiving system uses synthesizer phase accumulation. A coupler coupled to a transmitter samples an undesired transmit signal. An adaptive interference canceller (AIC) module varies phase and amplitude of the sampled undesired transmit signal to provide a cancellation output signal. The AIC module has a frequency synthesizer with phase accumulation for varying the phase of the sampled undesired transmit signal. An antenna receives receive signals and the undesired transmit signal. A summing circuit connected to the receive antenna and the adaptive interference module sums the receive signals, the received undesired transmit signal, and the cancellation signal to cancel the received undesired transmit signal. An AIC controller module is coupled to the summing circuit output to detect a null in the undesired transmit signal, to generate a cancellation feedback signal, and to provide the cancellation feedback signal to the AIC module.

REFERENCES:
patent: 3699444 (1972-10-01), Ghose
patent: 3928813 (1975-12-01), Kingsford-Smith
patent: 4952193 (1990-08-01), Talwar
patent: 5317322 (1994-05-01), Grobert
patent: 5903194 (1999-05-01), Opsahl
patent: 6370205 (2002-04-01), Lindoff et al.

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