Qualcomm Incorporated

Leon Metreaud

Hakan Inanoglu

Xiangdong Zhang

Mark S Wallace

Francesco Gatta

Adrianus Van Bezooijen

Erwin Spits

Chirag Sthalekar

A wireless communication device is provided with an in-device capability of characterizing the coupling between a pair of antennas. The wireless communication device determines the coupling through an operating gain measurement and through calibration gain measurements obtained through test ports.

In-device characterization of antenna coupling

An in-situ delay measurement is performed for an envelope-tracking power amplifier of an RF input signal. Because the delay measurement is in-situ, the delay measurement avoids the necessity to down convert and digitize a version of an RF output signal from the envelope-tracking power amplifier.

In-situ measurement of the delay between the envelope and the RF signal in envelope-tracking systems

Certain aspects and embodiments provide for accurate measurement and estimation of imbalances between in-phase (I) and quadrature (Q) components of a complex baseband signal. The accuracy of I/Q phase imbalance estimates may be enhanced by conducting them on a transmitter and a receiver that are connected via a local, loopback connection and by removing cross-spectrum interference in transferred packets. Once these accurate I/Q phase imbalances are determined, they may be used to adjust a signal processed by the transmitter or the receiver to increase the performance and data throughput of communications using the signal.

I/Q imbalance estimation and correction in a communication system

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Pepperell, MA, United States of America

Leon Metreaud