Estimation and reduction of second order distortion in real time

摘要

A radio receiver method of reducing second order distortion components involves at a first mixer, mixing an input signal with an oscillator signal to generate an I component of a received radio communication signal; at a second mixer, mixing the input signal with a phase shifted oscillator signal to generate a Q component of the received radio communication signal; computing an estimate of second order distortion as a function of the I and Q components of the received radio communication signal; and adjusting an operational parameter of the radio receiver to reduce the estimated value of second order distortion components. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract.

主权项

1. In a radio receiver, a method of reducing second order distortion components, comprising:
receiving a radio communication signal as an input signal at the radio receiver; at a first mixer, mixing the input signal with an oscillator signal to generate an I component of the received radio communication signal; at a second mixer, mixing the input signal with a phase shifted oscillator signal to generate a Q component of the received radio communication signal; computing, while receiving the radio communication signal and mixing the input signal with an oscillator signal and mixing the input signal with a phase shifted oscillator signal, an estimate of second order distortion as a function of only the I and Q components of the received radio communication signal produced by the first and second mixers; and adjusting, while receiving the radio communication signal and mixing the input signal with an oscillator signal and mixing the input signal with a phase shifted oscillator signal, an operational parameter of the radio receiver to reduce the estimated value of second order distortion components.