Abstract
In order to use the harmonic ratio to measure the flying height with wide usable bands and high signal to noise ratio for ultrahigh density magnetic recording systems, the harmonic selection channel should be made narrow. But intersymbol interference (ISI) could be, therefore, introduced when this setup is used in the track seeking process. As a result, the measurement accuracy deteriorates significantly. Due to the band-limited nature of the harmonic selection channel, a linear equalizer based on the minimum mean-square error algorithm can be adopted to compensate for ISI and the accuracy achievable is 99%.
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