Blind Mechanism for Estimation and Correction of I/Q Impairments

摘要

A mechanism for blind estimation of parameters for correcting I/Q impairments. Complex samples of a complex baseband signal are received from a receiver. A cross-correlation is computed between an I component and a Q component of the complex samples. A mean square value is computed for the I component of the complex samples; and a mean square value is computed for the Q component of the complex samples. A cross-channel gain estimate is: computed based on the cross-correlation value and one or both of the mean square values; and used to apply a cross-channel gain correction to the complex samples. An estimate of an I/Q gain imbalance is computed based on the mean square values. The gain imbalance estimate is useable to correct an I/Q gain imbalance present in the complex samples. The parameters may be supplied to the receiver, enabling the receiver to apply online corrections.

主权项

1. A method for blind estimation of receiver correction parameters, the method comprising:
(a) receiving complex samples of a complex baseband signal from a receiver; (b) computing a value of cross-correlation between a I component of the complex samples and a Q component of the complex samples; (c) computing a mean square value IMS of the I component of the complex samples, and computing a mean square value QMS of the Q component of the complex samples; (d) computing an estimate for a cross-channel gain k based on the cross-correlation value and one or both of the mean square values IMS and QMS; (e) applying a cross-channel gain correction to the complex samples based on the estimate for the cross-channel gain k, in order to obtain modified complex samples; (f) computing an estimate of a gain imbalance based on the mean square values IMS and QMS, wherein the gain imbalance estimate is useable to correct an I/Q gain imbalance present in the complex samples.