Electromagnetic mixing formulas and applications [Book Review]

CODING AND ITERATIVE DETECTION FOR MAGNETIC RECORDING CHANNELS By Zinning Wu, Kluwer Academic Publishers, 2000. The increasing demand for high-density information storage systems and the steady dropping price for digital integrated circuits have motivated the sophisticated digital signal processing and coding techniques for magnetic recording systems such as the hard disk in computers. This book proposes several approaches to enhance the performance of magnetic recording systems by coding and interpolated time recovery. It provides a tutorial introduction to turbo codes, LDPC (low density parity check) codes, and their iterative detection schemes, with emphasis on the simplification of the detection structure for the implementation of various codes. Chapter 1 (pp. 1-19) is an introduction to magnetic recording. Chapter 2 (pp. 21-46) introduces the turbo codes and discusses turbo equalization for ISI (intersymbol interference) channels. Chapter 3 (pp. 47-69) covers the major concepts for LDPC codes and their iterative detection algorithms. Chapter 4 (pp. 71-102) introduces the decision aid equilization structure to simplify iterative detection. Chapter 5 (pp. 103-117) proposes the interleaves parity code and its reduced complexity decoder, which is believed practical with current integrated circuit technology. Chapter 6 (pp. 119-135) proposes an interpolated timing recovery scheme leading to a new structure for implementing iterative detection on recording channels. Chapter 7 (pp. 137-139) summarizes the book with a discussion on future research topics in this field. There is a reference list (pp. 141-150) and an index (pp. 151-152) at the end of the book. This book used magnetic recording in its title. In fact, the techniques described in this book are not limited to magnetic recording systems. On the other hand, the performance of the various techniques described in this book may depend on the nature of the noise in the system and the available chips for the practical implementation of various schemes. Anyway, this book is a valuable reference for engineers and researchers working on digital signal processing and magnetic recording. It can be used as a supplementary text for graduate courses on communication, coding, and signal processing. —H. Hsu