Title :
Compensation of PLL Loop Delay in Read Channels for Tape Storage Systems
Author :
Oler, S. ; Eleftheriou, Evangelos ; Hutchins, Robert A.
Author_Institution :
IBM Res.-Zurich, Ruschlikon, Switzerland
Abstract :
This paper studies loop-delay compensation as a means to improve the robustness of timing recovery loops in tape storage systems. The delay compensation scheme is derived under fairly general assumptions and is found to match a known Kalman-filtering-based solution if a random-walk model of frequency-offset evolution is assumed. Extensions of the scheme to achieve delay compensation in multichannel tape-drive systems that employ global timing control are presented. The practical effectiveness of delay compensation is demonstrated using actual readback waveforms captured on commercial tape drives.
Keywords :
Kalman filters; phase locked loops; tape recorders; Kalman-filtering-based solution; PLL loop delay compensation; frequency-offset evolution; global timing control; random-walk model; read channels; readback waveforms; tape storage systems; Control systems; Delay effects; Delay estimation; Filters; Frequency estimation; Phase estimation; Phase locked loops; Sampling methods; Timing; Voltage-controlled oscillators;
Conference_Titel :
Global Telecommunications Conference, 2009. GLOBECOM 2009. IEEE
Conference_Location :
Honolulu, HI
Print_ISBN :
978-1-4244-4148-8
DOI :
10.1109/GLOCOM.2009.5425364
