Method and apparatus for baseband processing an analog signal in a direct conversion radio receiver
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United States of America Patent
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May 24, 2016
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app pub date -
Dec 19, 2014
filing date -
Dec 19, 2014
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Abstract
A method and apparatus are provided for reducing aliasing in a direct conversion (or zero-IF) radio receiver having high and low frequency paths. According to an implementation, a non-transitory machine-readable memory stores aliasing correlation response data that associates a measured non-aliased signal in a high frequency path and a measured aliased residual of the signal in a low frequency path. A compensator is in communication with the memory to apply aliasing compensation to received signals based on the stored aliasing correlation response data. In an example implementation, the low and high frequency paths are independently optimized for low and high frequency performance, respectively, and have transfer functions that overlap with one another to create a calibration zone used to calibrate the first and second transfer functions.
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