Patent Document ID: 8774259
Application ID: 13887059
Patent Flag: 1

Claim One:
1. A method for determining I/Q impairments of a transmitter, the method comprising: performing a set of operations, wherein the set of operations includes: (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 complex exponential tone to obtain an adjusted complex signal, wherein the complex exponential tone is at frequency f, 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 complex signal, wherein a receiver is configured to receive the transmit signal and capture a sampled complex signal representing the received transmit signal; (b) computing raw I/Q impairments based on the sampled complex signal; (c) transforming the raw I/Q impairments to determine transformed I/Q impairments, wherein said transforming removes measured I/Q impairments of the receiver from the raw I/Q impairments; (d) updating the current estimate of the I/Q impairments of the transmitter based on path-compensated I/Q impairments, wherein the path-compensated I/Q impairments are obtained by removing a current estimate of a signal path from the transformed I/Q impairments, wherein the signal path includes a path from an I/Q modulator of the transmitter to a demodulator of the receiver.