Ebook: Quaternary Codes

In recent years, quaternary codes have attracted the attention of the coding comminity as several notorious binary nonlinear codes containing more codewords than any known linear codes were found to be binary images under the Gray map of linear codes over Z4. This discovery opens the way for a broader study of quaternary codes, which constitute a rapidly growing area of coding theory. Based on the author's lectures, the book covers the most recent developments in the theory