The book is intended for an introductory communications course and is written at a level appropriate for advanced undergraduate and first-year graduate students.

The fourth edition covers both analog and digital communications. It features worked examples and exercises for students to solve within chapters, helping them to master new concepts as they are introduced.

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New Features:

• The book now has a brand new chapter on spread spectrum, which includes multiple access methods and wireless systems.
• A number of topics have been added or expanded, including: DSL (digital subscriber lines) including ADSL and ISDN; SONET, Computer Networks, including OSI and TCP/IP protocols and data encryption; digital audio recording, HDTV and expanded treatment of receivers; and turbo coding, trellis coded modulation and updated and expanded treatment of convolutional coding.
• New worked out examples and end-of-chapter problems have been added to further update the book.
• The pedagogy of the book has been greatly enhanced to further the reader's understanding of the material. The chapters each open with a listing of the main sections, a general statement of what is to come, and objectives. Optional topics within chapters are marked with a star. Key terms are boldfaced when their definitions are provided. Examples, which often have matching exercises, are cleary marked for easy reference. Key ideas are boxed to distinguish them for the reader.
• www.mhhe.com/carlson -- An expanded website, including the password-protected solutions manual for the instructor and PowerPoint slides.

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Table of Contents:

1 Introduction

2 Signals and Spectra

3 Signal Transmission and Filtering

4 Linear CW Modulation

5 Exponential CW Modulation

6 Sampling and Pulse Modulation

7 Analog Communication Systems

8 Probability and Random Variables

9 Random Signals and Noise

10 Noise in Analog Modulation Systems

11 Baseband Digital Transmission

12 Digitization Techniques for Analog Messages and Computer Networks

13 Channel Coding and Encryption

14 Bandpass Digital Transmission

15 Spread Spectrum Systems

16 Information and Detection Theory

Appendix: Circuit and System Noise

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