Wireless communication receiver with I/Q imbalance estimation and correction techniques

摘要

Techniques are provided that utilize information on the characteristics of the transmitted signal to improve the accuracy of the I/Q imbalance estimation and correction. These techniques can be used to achieve improved image rejection performance over existing solutions, through the use of signal conditioning, windowing and the use of statistical information on the received signal. A number of techniques aimed at improving the accuracy of the I/Q imbalance estimation/correction are presented, including different modes of I/Q imbalance estimation and I/Q imbalance correction in the presence of a complex IF filter in the transceiver. The processing is performed mostly in the DBB in order to be area/power efficient.

主权项

1. A wireless communication receiver, comprising:
a radio frequency (RF) front end configured to be in communication with an antenna; a digital baseband processing module in communication with the RF front end and, comprising: a digital front end, comprising:
an I/Q imbalance estimation module that receives plurality of I/Q samples of a received baseband signal and calculates a number of quantities characterizing properties of the plurality of I/Q samples of a received baseband signal; andan I/Q imbalance correction module that applies a plurality of I/Q imbalance correction values to the plurality of the I/Q samples of the received baseband signal; a digital processing module, coupled to the digital front end, that generates a plurality of estimates characterizing gain and phase imbalance according to at least part of the quantities characterizing at least part of the properties of the I/Q samples of the received baseband signal, wherein the digital processing module uses the estimates characterizing the gain and the phase imbalance to calculate a configuration of generation of the I/Q imbalance correction values and supplies the same to the I/Q imbalance correction module, wherein the I/Q imbalance correction module generates one set of the I/O imbalance correction weights on one block of the I/Q samples according to one set of the estimates of the gain and the phase imbalance calculated from a set of quantities of another one block of the I/Q samples.