Detection and mitigation of interference in a receiver

摘要

A receiver architecture optimizes receiver performance in the presence of interference. In various embodiments, power estimation circuits are used with variable selectivity to determine the exact nature of the interference and to optimize the performance correspondingly. The variable selectivity is achieved using stages of filtering with progressively narrower bandwidths. Also, the actual method of optimizing the receiver performance is an improvement compared to the traditional techniques in that the gain settings and the baseband filter order (stages to be used) will be optimized based on the nature of the interference as determined by the power detector measurements. For a device such as a cellular phone that operates in a dynamic and changing environment where interference is variable, embodiments advantageously provide the capability to modify the receiver's operational state depending on the interference.

主权项

1. A method comprising:
amplifying an input signal to provide an amplified input signal; mixing the amplified input signal with an oscillator signal, to provide a mixed signal; measuring voltage or power of the mixed signal; filtering the mixed signal, at a first filter, to pass a first band of frequencies, to provide a first filtered signal; amplifying the first filtered signal, to provide a first amplified signal; measuring voltage or power of the first amplified signal; filtering the first amplified signal, at a second filter, to pass a second band of frequencies narrower than the first band, to provide a second filtered signal; decreasing a gain used for at least one of the amplifying the input signal and the mixing, when the measured voltage or power of the mixed signal is greater than a first predetermined threshold and the measured voltage or power of the first amplified signal is less than a second predetermined threshold; and decreasing a gain used for at least one of the amplifying the first filtered signal, the amplifying the input signal, and the mixing, when the measured voltage or power of the first amplified signal is greater than the second predetermined threshold.