Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2011-01-25
2011-01-25
Bocure, Tesfaldet (Department: 2611)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S343000
Reexamination Certificate
active
07876867
ABSTRACT:
Techniques for detecting and mitigating intermodulation distortion (IMD) are described. A device (e.g., a cellular phone) obtains digital intermodulation distortion and digitally determines intermodulation distortion in an input signal based on the digital intermodulation distortion. The device may correlate the digital intermodulation distortion with the input signal and determine intermodulation distortion in the input signal based on correlation results. The device may adjust the operation of one or more circuit blocks (e.g., a mixer, an LNA, etc.) in a receiver based on the detected intermodulation distortion in the input signal. Alternatively or additionally, the device may condition the digital intermodulation distortion to obtain conditioned intermodulation distortion matching intermodulation distortion in the input signal and may then subtract the conditioned intermodulation distortion from the input signal.
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Filipovic Daniel F.
Komninakis Christos
Bocure Tesfaldet
Qualcomm Incorporated
Williams Lawrence B
Xu Jiayu
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