Bound for loss of lock rate in partial response recording channels

2002 ◽  
Vol 38 (16) ◽  
pp. 928 ◽  
Author(s):  
J. Liu ◽  
H. Song ◽  
B.V.K. Vijaya Kumar
Keyword(s):  
Partial Response ◽  
Recording Channels

Reducing the Thermal Asperity Effect in Perpendicular Magnetic Recording System

2014 ◽  
Vol 931-932 ◽  
pp. 1260-1264
Author(s):  
Yupin Suppakhun
Keyword(s):  
Partial Response ◽  
System Performance ◽  
Recording System ◽  
Perpendicular Recording ◽  
Pass Filter ◽  
Noise Estimate ◽  
Recording Channels ◽  
Maximum Likelihood Detector ◽  
High Pass ◽  
A Current

In this paper, we propose a new method to estimate and reduce effectively thermal asperity (TA) in the perpendicular recording channels with state trellis. The proposed method comprises of recursively applying a previous noise estimate to a calculation of a current noise estimate to eliminate the effects of TA from the equalized signal. With partial response a maximum-likelihood detector base on partial-response (PR) target with DC-full component can improve the system performance by more than 50% when TA occurs. Unlike previous studies of TA cancellation or suppression, this method is different because we dont use PR targets with non-dc components and high pass filter.

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