We have some time ago noticed that finding a book dealing with topics in
the ad- vanced theory and applications of signal detection is not quite
an easy matter. This is contrasted with that there are numerous books on
the more general subject of de- tection and estimation.Frankly,
ourexperience and expertise is only on some partial portions of the
theory and recent topics of signal detection. This book is therefore
meant to include not all the advanced and interesting topics in the
theory and appli- cations ofsignal detection, butjust onlysome subsets
of them: some such important and interesting topics and issues as
distributed signal detection and sequential de- tection are not
considered only due to our limited knowledge and capacity. The goal we
have in mind for this book is to present several advanced topics in
signal detection theory and thereby help readers gain novel ideas and
insights. In this book, we have tried to completely present in a unified
way the theme oflocally optimum detection ofsignals in generalized
observations. Among our hope is thus that the readers would be able to
understand the concepts and fundamentals of a generalized observation
model as applied to signal detection problems. This book will also allow
the readers, whether they are students, academics, practitioners, or
researchers, to have an expanded view on signal detection.