Patent Document ID: 20140153664
Application ID: 14172992
Patent Flag: 0

Claim One:
1. A method for determining I/Q impairments of a transmitter, the method comprising: (a) supplying a pre-compensation transformation to a pre-compensation circuit of the transmitter, wherein the pre-compensation circuit is configured to apply the pre-compensation transformation to a tone in order to obtain an adjusted signal, wherein the pre-compensation transformation is configured to pre-compensate for a current estimate of the I/Q impairments of the transmitter, wherein the transmitter is configured to transmit a transmit signal based on the adjusted signal; (b) computing raw I/Q impairments based on a frequency-shifted signal, wherein the frequency-shifted signal is a result of frequency shifting a sampled signal by an amount of offset between a local oscillator (LO) of the transmitter and a local oscillator of a receiver, wherein the sampled signal has been captured by a receiver in response to said transmission of the transmit signal; (c) removing a current estimate of a signal path from the raw I/Q impairments to obtain path-compensated I/Q impairments, wherein the signal path includes a path from an I/Q modulator of the transmitter to a demodulator of the receiver; and (d) updating the current estimate of the I/Q impairments of the transmitter based on the path-compensated I/Q impairments.