Adaptive Two-Point Modulation of Wireless Phase Locked Loops

Two-point modulation, a form of two-degrees-of-freedom control, extends the modulation bandwidth of a phase-locked loop beyond its closed-loop bandwidth. However, its acceptable performance depends critically on the relative gain of two modulation paths, one of which includes the plant-a voltage con...

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Bibliographic Details
Published in:IEEE transactions on control systems technology 2012-05, Vol.20 (3), p.804-807
Main Authors: Ballantyne, G. J., Bo Sun
Format: Article
Language:English
Subjects:
Acceptability
Adaptative systems
Adaptive control
Applied sciences
Bandwidth
Computer science
control theory
systems
Computer systems and distributed systems. User interface
Control systems
Control theory. Systems
digital-controlled oscillator (DCO)
Drift
Exact sciences and technology
feedforward systems
Frequency modulation
Gain
Modulation
Phase locked loops
phase locked loops (PLLs)
Phase modulation
Software
Voltage-controlled oscillators
Wireless communication
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Description
Summary:Two-point modulation, a form of two-degrees-of-freedom control, extends the modulation bandwidth of a phase-locked loop beyond its closed-loop bandwidth. However, its acceptable performance depends critically on the relative gain of two modulation paths, one of which includes the plant-a voltage controlled oscillator (VCO). This gain-balance problem is troublesome, especially in wireless communication applications, where the VCO gain is generally unknown and subject to drift. The proposed solution is via a canonical problem in model reference adaptive control.
ISSN:1063-6536
1558-0865
DOI:10.1109/TCST.2011.2129592