Narrowband interference excision in the external controller...

Details Narrowband interference excision in the external controller... Narrowband interference excision in the external controller...

2007-12-13

2010-12-28

Le, Thanh C (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S306000

Reexamination Certificate

active

07860476

ABSTRACT:
Communication techniques are described that can improve signal reception from an implanted wireless device to a main control unit (MCU) while in the presence of a narrowband interferer. The implanted wireless device can be any appropriate device such as a microtransponder, microstimulator, a sensor device or a drug delivery device. The MCU captures samples of signals emanating from the wireless device during an expected transmission time interval. The captured samples are evaluated and transformed into a series of spectral terms that are then evaluated to identify narrowband interference signals. The identified narrowband interference terms can be initialized to a null value to remove the signal spectrum resulting from the communication, and an inverse transformation can be used to generate a time domain signal that is free from interference. Overlapping windows and other signal processing techniques can also be applied to improve overall communications.

REFERENCES:
patent: 5410750 (1995-04-01), Cantwell et al.
patent: 7237712 (2007-07-01), DeRocco et al.
patent: 2010/0114243 (2010-05-01), Nowak et al.

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