US 11,973,629 B2
Non-disruptive phased array calibration for FDD and TDD communication systems
Gregg S. Nardozza, Madison, NJ (US); Giovanni Marzin, San Michele al Tagliamento (IT); Yiping Feng, Skillman, NJ (US); Robert C. Frye, Piscataway, NJ (US); and Mihai Banu, New Providence, NJ (US)
Assigned to NEC Advanced Networks, Inc., New Providence, NJ (US)
Filed by NEC Advanced Networks, Inc., New Providence, NJ (US)
Filed on Oct. 4, 2022, as Appl. No. 17/959,711.
Claims priority of provisional application 63/251,858, filed on Oct. 4, 2021.
Prior Publication US 2023/0106538 A1, Apr. 6, 2023
Int. Cl. H04L 27/26 (2006.01); H04B 17/21 (2015.01)
CPC H04L 27/2666 (2013.01) [H04B 17/21 (2015.01); H04L 27/2646 (2013.01)] 14 Claims
OG exemplary drawing
 
1. 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, said method comprising:
injecting a first calibration tone into the transmitter chain, said first calibration tone located within one of the lower and upper guard bands of the communication channel of the transmitter chain;
detecting the first calibration tone arriving at the end of the transmitter chain to generate a first detected calibration signal;
comparing the first detected calibration signal to the injected first calibration tone to produce a first comparison signal; and
adjusting the phase and/or gain of the transmitter chain based on the first comparison signal.