Nec Advanced Networks, Inc.

Blue Danube Systems, Inc.

Gregg S Nardozza

Mihai Banu

Yiping Feng

Giovanni Marzin

A method of calibrating a transmitter chain in a phased array system in which a lower guard band is assigned to a lower side of an operating carrier of a communication channel and an upper guard band is assigned an upper side of the operating carrier includes injecting a first calibration tone into the transmitter chain and detecting its arrival at the end of the transmitter chain, at which point a first detected calibration signal is generated. The first detected calibration signal and the injected first calibration tone are then compared to produce a first comparison signal. The transmitter chain's phase and/or gain is then adjusted based on this first comparison signal. The first calibration tone located within one of the lower and upper guard bands of the communication channel of the transmitter chain.

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Madison, NJ, United States of America

Gregg S Nardozza