Patent ID: 8953663
Filing Date: 2015-02-10
Classification: H04B,H04L

Abstract:
1. A method, comprising: injecting a single-frequency signal including an I-channel and a Q-channel into a transmitter of a direct conversion transceiver to produce a transmitter signal in the radio frequency (RF) portion of the transmitter; generating two phase-shifted signals via the transmitter signal, wherein the generating the two phase-shifted signals comprises: coupling the two phase-shifted signals to the RF portion of a receiver of the direct conversion transceiver via a portion of a loopback path located between the RF portion of the transmitter and an RF portion of a receiver, the generating of the two phase-shifted signals occurring in the portion of the loopback path located between the RF portion of the transmitter and the RF portion of the receiver; measuring two receiver signals, from the receiver, generated by the two phase-shifted signals, the measuring comprising measuring both the I-channel and the Q-channel; determining a set of parameters based upon the measured two receiver signals; and calculating correction parameters for quadrature imbalance for both the transmitter and the receiver via the set of parameters, wherein the correction parameters relate to correcting phase imbalance and gain imbalance for both the transmitter and the receiver and wherein the determining the set of parameters and calculating the correction parameters for both the phase imbalance and gain imbalance for both the transmitter and the receiver are based on the two phase-shifted signals generated in the portion of the loopback path located between the RF portion of the transmitter and the RF portion of the receiver.