Determining a signal to noise ratio for an arbitrary data sequence by a time domain analysis

Mian, Guo; Howell, T.D.

doi:10.1109/20.281369

Cited by 22 publications

(7 citation statements)

References 3 publications

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“…In order to be as unbiased as possible, the test signal should reasonably simulate random user data and be long enough to estimate the noise. A time-domain technique developed by Mian and Howell [12] based on the autocorrelation of the signal from a PRBS satisfies these requirements. The autocorrelation signal-to-noise ratio (ACSN) measured with 20 periods of a 127-bit PRBS for the CoCrPt alloy media measured with the single-turn head is shown in Fig.…”

Section: A Head/disk Parametric Propertiesmentioning

confidence: 96%

Perpendicular recording near 100 Gb/in/sup 2/

et al. 2003

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Theoretical analyses have projected perpendicular recording capable of achieving ultimate areal densities greater than longitudinal recording systems. For perpendicular recording to supplant longitudinal recording, laboratory demonstrations will need to be made which intercept or exceed the areal densities achieved by state-of-the-art longitudinal recording demonstrations. Recent demonstrations have come close to eliminating the gap between these technologies. In this paper, recording experiments at areal densities in the 60 to 100 Gb/in 2 range will be described. It will be shown that the head field from conventional single-pole writers is not well localized to the data track and that if the media do not have sufficiently high nucleation thresholds, this fringe field will gradually erase data on the adjacent track if the track pitch is too aggressive. Extension of this technology to densities of the order of 1 Tb/in 2 will require heads that reduce the extent of the fringe field without sacrificing available on-track field.Index Terms-Magnetic recording high-density recording, magnetic recording systems integration, superparamagnetic limit.

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Section: A Head/disk Parametric Propertiesmentioning

confidence: 96%

Perpendicular recording near 100 Gb/in/sup 2/

et al. 2003

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“…The SNR is calculated using the ratio of rms signal power to rms noise power. Hence this method gives similar results to a measurement of SNR taken with a spectrum analyzer [7], [8]. However, we emphasize that the contact tester detects signal from written transitions as a function of spatial position down the track, rather than as a function of time, as one might measure on a spin stand.…”

Section: Experimental Methodsmentioning

confidence: 51%

“…This method is based on the properties of the cross-correlation coefficient between two different random variables [7]. The SNR is calculated using the ratio of rms signal power to rms noise power.…”

Section: Experimental Methodsmentioning

confidence: 99%

Comparison of perpendicular and longitudinal magnetic recording using a contact write/read tester

Leonhardt

Veerdonk²,

Heijden³

et al. 2001

IEEE Trans. Magn.

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We have performed longitudinal and perpendicular magnetic recording measurements using a contact write/read tester, which scans a magnetic recording head in contact with the recording media. Our tester has a demonstrated positioning resolution of 5 nm. Perpendicular transitions in the range 125-425 kfci were recorded on double-layer perpendicular media with a high moment soft underlayer. The perpendicular bits were imaged using both a giant magnetoresistance (GMR) read head on the contact tester and using magnetic force microscopy (MFM). Longitudinal bit transitions with linear densities in the range 25 to 725 kfci were recorded, and the signal-to-noise ratios of both the perpendicular and longitudinal systems were measured.

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“…/yS and /fS are the mean values of azimuth angle y and polar angle f, respectively. where the Var and s states the variance and standard deviation, respectively [22]. It should be noted that in the high frequency range like 423 kfci, the time domain method underestimates the SNR compared with the frequency domain method.…”

Section: Resultsmentioning

confidence: 99%