Patent ID: 7567611
Filing Date: 2009-07-28
Classification: H04B,H04L

Abstract:
1. A radio transceiver comprising: at least one antenna; a receiver section having a quadrature demodulator for receiving various signals and converting the various signals into in-phase and quadrature phase signals; a transmitter section for transmitting at least one known signal to an input of the quadrature demodulator for conversion by the quadrature demodulator; a switching unit configurable for providing an amount of isolation between an output port of the transmitter section and an input port of the receiver section such that when the at least one known signal is present at the output port at a first power level, the at least one known signal is also present at the input port at a second power level lower than the first power level and is converted by the quadrature demodulator; at least one receiver compensation factor estimation unit coupled to an output of the quadrature demodulator for estimating, after conversion of the at least one known signal into in-phase and quadrature phase signals, at least one receiver compensation factor for compensating the receiver section for an imbalance in subsequently received in-phase and quadrature phase signals; and one or more compensation components that perform a compensation protocol wherein the protocol includes: communicate information regarding calibration imbalance with another transceiver to perform compensation; estimating an I-Q imbalance compensation at the receiver, communicating the estimated receiver I-Q imbalance to the transmitter, computing at the transmitter compensation factors for the transmitter as a function of the estimated receiver I-Q imbalance.