Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2005-02-18
2008-10-07
Tran, Khanh C (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
Reexamination Certificate
active
07433420
ABSTRACT:
Apparatus, systems, and methods are described that implement techniques for estimating a relative rotation between a first complex signal and a second complex signal. In apparatus form, a rotation-estimation circuit includes a first quadrant detector and receives the first and second complex signals and produces an estimate of the relative rotation between the complex signals. A variable rotator receives the estimate of the relative rotation and rotates at least one of the first and second complex signals using the estimate of the relative rotation. In method form, a first quadrant estimate is calculated that corresponds to the relative rotation between the first and second complex signals, and at least one of the first and second complex signals is rotated using the quadrant estimate of the relative rotation.
REFERENCES:
patent: 5774510 (1998-06-01), Izzard
patent: 6094464 (2000-07-01), Ebringer et al.
patent: 6535562 (2003-03-01), Mohseni et al.
patent: 7020447 (2006-03-01), Nagatani et al.
Dawson et al., “Automatic Phase Alignment for a Fully Integrated Cartesian Feedback Power Amplifier System”, IEEE Journal of Solid-State Circuits, Dec. 2003, 38(12): 2269-2279.
Faulkner et al., “Performance of automatic phase adjustment using supply current minimization in a RF feedback lineariser,” in Proc. 8th IEEE Int. symp. Personal, Indoor, and Mobile Radio Communications, 1997, pp. 858-862.
Ohishi et al., “Cartesian Feedback Amplifier with Soft Landing,” in Proc. 3rd IEEE Int. Symp. Personal, indoor, and Wireless Communications, 1992, pp. 402-406.
Sornin et al., “A robust Cartesian feedback loop for a 802.11 a/b/g CMOS transmitter”, 2004 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, Forth Worth, TX, Jun. 6-8, 2004, pp. 145-148.
Dakshinamurthy Sriraman
Dawson Joel L.
Shaeffer Derek K.
Titizer Korhan
Beceem Communications Inc.
Tran Khanh C
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