Receiver-side estimation of and compensation for signal impairments

摘要

A receiver receives a repeating or periodic signal and, based on the signal, estimates a carrier frequency offset for the receiver. Based on the signal and the estimated carrier offset, an I/Q mismatch for the receiver is estimated and compensation for the estimated I/Q mismatch is performed. After compensating for the estimated receiver I/Q mismatch, the carrier frequency offset is re-estimated.

主权项

1. A method, comprising:
in a transceiver:
receiving a repeating or periodic signal;iteratively estimating a carrier frequency offset for the transceiver based on the signal, estimating an I/Q mismatch for the receiver based on the signal and the estimated carrier frequency offset, and compensating for the estimated I/Q mismatch, while the estimated carrier frequency offset is not less than a threshold and for a number of iterations that does not exceed a specified count;after iteratively estimating the carrier frequency offset, estimating the I/Q mismatch, and compensating for the estimated I/Q mismatch, compensating for the estimated carrier frequency offset as estimated in a final iteration; andafter compensating for the estimated carrier frequency offset as estimated in the final iteration, estimating channel distortion and transmitter-side I/Q mismatch, and compensating for the estimated channel distortion and transmitter-side I/Q mismatch.