Telecommunications – Transmitter and receiver at separate stations – Distortion – noise – or other interference prevention,...
Reexamination Certificate
2005-05-31
2005-05-31
Urban, Edward F. (Department: 2685)
Telecommunications
Transmitter and receiver at separate stations
Distortion, noise, or other interference prevention,...
C455S307000, C455S063200, C455S278100, C455S296000, C375S350000
Reexamination Certificate
active
06901243
ABSTRACT:
Techniques for detecting and mitigating adjacent channel interference (ACI) in a wireless (e.g., CDMA) communication system. In one aspect, ACI may be determined by signaling or detected by filtering a pre-processed signal in each frequency range where ACI may be present (e.g., with a respective bandpass filter), estimating the energy of the filtered signal for each frequency range, comparing the estimated energy against an ACI threshold, and indicating the presence or absence of ACI at each frequency range based on the result of the comparison. In another aspect, a selectable filter (e.g., a FIR filter) having a number of possible filter responses (e.g., provided by a number of sets of filter coefficients) may be used to provide filtering for the pre-processed signal and to reject any detected ACI. One of the possible filter responses is selected for use depending on whether and where ACI has been detected.
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Corbaton Ivan Jesus Fernandez
Jayaraman Srikant
Smee John E.
Le Lana
Nguyen Thien T.
QUALCOMM Incorporated
Urban Edward F.
Wadsworth Philip R.
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