The writing of the book would not have been possible without the many distinguished mathematicians, scientists, and engineers whose work forms the basis of the depth and breadth of much the material presented. The names of these distinguished men and women, upon whose shoulders I have stood throughout my careers in radar and communication systems, appear in the many references provided in each chapter. The preparation of the manuscript was encouraged by my colleagues James J. Merkel, Mark A. Cusano, and Kevin J. Lynaugh, who also proofread several chapters and provided helpful suggestions. Finally, I want to acknowledge my wife Donna and Jacob R. Pearson who proofread the manuscript and provided editorial suggestions and the editorial and production staff at Wiley in the arduous tasks leading to the production of the book.