hesela.devNoise-predictive maximum-likelihood detection
Noise-predictive maximum-likelihood (NPML) detection incorporates noise prediction or whitening into sequence-detector branch metrics for a partial-response recording channel.
Eleftheriou and Hirt (1996) describe incorporating noise prediction into a Viterbi detector and report simulation gains over PRML and EPRML for the studied configurations. This is a detector refinement, not a new storage medium or an error-correcting code. The 2001 Cideciyan et al. study distinguishes bit, byte and sector error performance when combining detection with parity post-processing and Reed-Solomon decoding. Its abstract reports that an improvement in bit and byte metrics did not yield the same sector-level separation for two compared schemes. Neither abstract supplies a universal improvement for arbitrary drives, firmware or workloads.
Relations
- related
- prml-encoding, reed-solomon-code, bit-error-rate
Advantages
- Models noise structure within sequence detection rather than treating noise prediction as a separate storage technology. [1]
Limitations
- Published simulated gains depend on the channel, detector and coding configuration; current product support is not established by these historical papers. [1, 2]