《通信系统工程(第2版改编版)》內容：The objective of this book is to provide an introduction to the basic princi ples in the analysis and design of communication systems. It is primarily intended for use as a text for a first course in communications, either at a senior level or at a firstyear graduate level.BROAD TOPICAL COVERAGE Although we have placed a very strong emphasis on digital communications, we have provided a solid introduction to analog communications. The major topics covered are: An introduction to analog signal transmission and reception （Chapters 2and3）An introduction to digital communications （Chapters 48）EMPHASIS ON DIGITAL COMMUNICATIONS Our motivation for emphasizing digital communications is due to the techno logical developments that have occurred during the past five decades. To day, digital communication systems are in common use and generally carry the bulk of our daily information transmission through a variety of communi cations media, such as wireline telephone channels, microwave radio, fiber optic channels, and satellite channels.