This book is concerned with two digital mobile radio systems: the global system for mobile communications (GSM); and a code division multiple access (CDMA) system that was originally known as the American interim standard 95, or IS-95 and is now called cdmaOne [1–7]. While GSM was conceived and developed through the concerted efforts of regulators, operators and equipment manufacturers in Europe, cdmaOne owes its existence to one dynamic Californian company, Qualcomm Inc. The authors have been i