Title :
Performance and sensitivity analysis of maximum-likelihood sequence detection on magnetic recording channels
Author :
Dolivo, F. ; Hermann, R. ; Ölcer, S.
Author_Institution :
IBM Zurich Res. Lab., Ruschlikon, Switzerland
fDate :
9/1/1989 12:00:00 AM
Abstract :
The results of a study comparing the performance of maximum-likelihood sequence detection (MLSD) for various magnetic-recording schemes are presented. The schemes considered are: run-length limited (RLL) coding, nonreturn to zero (NRZ) recording, and partial-response class IV (PR-IV) and extended partial-response class IV (EPR-IV) signaling. The MLSD of RLL-coded and NRZ recording systems provides bounds on the performance that can be achieved, respectively, by peak detection systems and by partial-response schemes more complex than PR-IV and EPR-IV. Performance of PR-IV and EPR-IV signaling with MLSD is compared with the obtained bounds: the gain in recording density over peak detection provided by these partial-response schemes is established, and the merit of using more complex partial-response systems is determined. The sensitivity of the PR-IV and EPR-IV systems to various parameters is examined
Keywords :
magnetic recording; sensitivity analysis; signal detection; NRZ recording; magnetic recording channels; maximum-likelihood sequence detection; nonreturn to zero recording; partial response class IV signalling; peak detection systems; recording density; run length limited coding; sensitivity analysis; Autocorrelation; Decoding; Magnetic recording; Matched filters; Maximum likelihood detection; Performance analysis; Pulse modulation; Sensitivity analysis; Signal to noise ratio; Viterbi algorithm;
Journal_Title :
Magnetics, IEEE Transactions on