1. Introduction. - 1. Soft iterative decoding. - 2. Digital communications. - 3. Applications. - 4. Overview. - 5. Notation. - 2. Message-Passing Algorithm. - 1. Preliminaries. - 2. Message-passing on graphs. - 3. Nodes and modules. - 4. Low-density parity-check codes. - 3. Forward-Backward Algorithm. - 1. Forward-backward algorithm. - 2. Turbo codes. - 4. Application to Magnetic Storage. - 1. Introduction. - 2. Magnetic recording channel. - 3. Performance. - 4. Other issues. - 5. Constrained Coding for Hard Decoders. - 1. Constrained coding. - 2. Concatenation. - 3. Lossless compression. - 4. Examples in magnetic recording. - 6. Constrained Coding for Soft Decoders. - 1. Constrained codes for soft decoding. - 2. Concatenation for soft decoding. - 3. Soft constraint decoding and modified concatenation. - 4. Combined constraint and ECC. - 7. Array Codes as LDPC Codes. - 1. Array codes. - 2. Soft decoding of array codes. - 8. Other Topics. - 1. Multilevel modulation. - 2. Potential applications of constrained coding. - 3. Soft interference cancellation. - 4. Other codes. - Appendices. - A List of nodes modules and graphs. - B LDPC codes over non-binary alphabets. - C Sliding-block codes for soft demodulation. - References. Language: English