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The latest read channels feature iterative detectors and probabilistic decoding of LDPC-like (Low Density Parity Check) codes. They provide improved detection while balancing the requirements for lower power and increased speed. Iterative detection channels mark the biggest change in read channels since the widespread adoption of PRML. (Partial Response Maximum Likelihood) in the early 1990’s.

This 1-Day seminar introduces data storage professionals to the concepts of soft detection, iterative detection and decoding, extrinsic information, and practical architectures. It provides worked examples for SOVA (Soft Output Viterbi Algorithm) detection and probabilistic decoding of an LDPC code. The benefits and drawbacks of iterative channels are explored.

Attending KnowledgeTek’s PRML/NPML/DDNP classes, or comparable industry experience, will satisfy the prerequisites.

Overview The Iterative Architecture Hard decisions Soft decisions Side information Review of Probability A priori probability A posteriori probability Conditional probability Log Likelihood Ratio (LLR) Detection: Calculating and             Comparing Probabilities Detection theory The Viterbi Algorithm (a review) The Soft-Output Viterbi Algorithm (SOVA) Comparison to BCJR

Fundamentals of Linear Block Codes Parity for detecting and correcting errors Linear algebra representation of codes The parity check matrix Low Density Parity Check (LDPC) Codes Definition Construction options Decoding methods Decoding example Conclusion The complete system Timing considerations Longer sectors Future trends

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Dates	Days	Location	Price
Available thru KnowledgeTek		(On-Site presentations)

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