Title :
Performance evaluation for FDTS/DF on MR nonlinear channels
Author :
Sawaguchi, Hideki ; Nishida, Yasutaka
Author_Institution :
Central Res. Lab., Hitachi Ltd., Kokubunji, Japan
fDate :
9/1/1996 12:00:00 AM
Abstract :
We evaluated the performance of fixed-delay tree-search detector with decision feedback (FDTS/DF) when used for nonlinear magneto-resistive (MR) read head channels. The feedback section of the FDTS/DF was replaced by RAM lookup table for nonlinear equalization. The evaluation was based on a computer simulation in which the read-back signal from the MR head was modeled from a measured MR transfer characteristic function and actual real reproduced isolated pulses. Performance was compared to that of PRML channels. We also compared the sensitivity of the FDTS/DF and PRML channels to variations in the recording channel frequency response due to head-medium spacing fluctuation. The results show that the FDTS/DF channel has good resistance to MR nonlinear distortion and channel response variations, and is superior to the PRML channels in terms of realistic recording channel response
Keywords :
decision feedback equalisers; frequency response; magnetic heads; magnetic recording noise; magnetoresistive devices; maximum likelihood detection; partial response channels; table lookup; FDTS/DF; MR nonlinear channels; PRML channels; RAM lookup table; channel response variations; decision feedback; fixed-delay tree-search detector; head-medium spacing fluctuation; magnetoresistive read head channels; nonlinear distortion; nonlinear equalization; read-back signal; recording channel frequency response; reproduced isolated pulses; transfer characteristic function; Computer simulation; Detectors; Feedback; Fluctuations; Frequency response; Magnetic heads; Nonlinear distortion; Pulse measurements; Read-write memory; Table lookup;
Journal_Title :
Magnetics, IEEE Transactions on