Digital Communications: Fundamentals and Applications
Author: Bernard Sklar
- The clear, easy-to-understand introduction to digital communications
- Completely updated coverage of today's most critical technologies
- Step-by-step implementation coverage
- Trellis-coded modulation, fading channels, Reed-Solomon codes, encryption, and more
- Exclusive coverage of maximizing performance with advanced "turbo codes"
"This is a remarkably comprehensive treatment of the field, covering in considerable detail modulation, coding (both source and channel), encryption, multiple access and spread spectrum. It can serve both as an excellent introduction for the graduate student with some background in probability theory or as a valuable reference for the practicing communication system engineer. For both communities, the treatment is clear and well presented."
— Andrew Viterbi, The Viterbi Group
Master every key digital communications technology, concept, and technique.
Digital Communication s, Second Edition is a thoroughly revised and updated edition of the field's classic, best-selling introduction. With remarkable clarity, Dr. Bernard Sklar introduces every digital communication technology at the heart of today's wireless and Internet revolutions, providing a unified structure and context for understanding them -- all without sacrificing mathematical precision.
Sklar begins by introducing the fundamentals of signals, spectra, formatting, and baseband transmission. Next, he presents practical coverage of virtually every contemporary modulation, coding, and signal processing technique, with numeric examples and step-by-step implementation guidance. Coverage includes:
- Signals and processingsteps: from information source through transmitter, channel, receiver, and information sink
- Key tradeoffs: signal-to-noise ratios, probability of error, and bandwidth expenditure
- Trellis-coded modulation and Reed-Solomon codes: what's behind the math
Synchronization and spread spectrum solutions - Fading channels: causes, effects, and techniques for withstanding fading
- The first complete how-to guide to turbo codes: squeezing maximum performance out of digital connections
- Implementing encryption with PGP, the de facto industry standard
Whether you're building wireless systems, xDSL, fiber or coax-based services, satellite networks, or Internet infrastructure, Sklar presents the theory and the practical implementation details you need. With nearly 500 illustrations and 300 problems and exercises, there's never been a faster way to master advanced digital communications. CD-ROM INCLUDED
The CD-ROM contains a complete educational version of Elanix' SystemView DSP design software, as well as detailed notes for getting started, a comprehensive DSP tutorial, and over 50 additional communications exercises.
Booknews
This graduate textbook describes techniques for transmitting voice and data over a path that consists of wires, waveguides, or space. Sklar (UCLA) covers source coding, baseband and bandpass signaling, channel coding, multiplexing, spreading, and encryption. The second edition adds a chapter on fading channels. The CD-ROM contains an educational version of SystemView and 200 exercises. Annotation c. Book News, Inc., Portland, OR
Booknews
Comprehensive coverage for senior-level undergraduates, first-year graduate students, and practicing engineers. Even though the emphasis is on digital communications, necessary analog fundamentals are included. Annotation c. Book News, Inc., Portland, OR (booknews.com)
Table of Contents:
(NOTE: Each chapter concludes with a Conclusion, References, Problems, Questions, and CD Exercises.)1. Signals and Spectra.
Digital Communication Signal Processing. Classification of Signals. Spectral Density. Autocorrelation. Random Signals. Signal Transmission through Linear Systems. Bandwidth of Digital Data.
2. Formatting and Baseband Modulation.
Baseband Systems. Formatting Textual Data (Character Coding). Messages, Characters, and Symbols. Formatting Analog Information. Sources of Corruption. Pulse Code Modulation. Uniform and Nonuniform Quantization. Baseband Modulation. Correlative Coding.
3. Baseband Demodulation/Detection.
Signals and Noise. Detection of Binary Signals in Gaussian Noise. Intersymbol Interference. Equalization.
4. Bandpass Modulation and Demodulation/Detection.
Why Modulate? Digital Bandpass Modulation Techniques. Detection of Signals in Gaussian Noise. Coherent Detection. Noncoherent Detection. Complex Envelope. Error Performance for Binary Systems. M-ary Signaling and Performance. Symbol Error Performance for M-ary Systems (M>>2).
5. Communications Link Analysis.
What the System Link Budget Tells the System Engineer. The Channel. Received Signal Power and Noise Power. Link Budget Analysis. Noise Figure, Noise Temperature, and System Temperature. Sample Link Analysis. Satellite Repeaters. System Trade-Offs.
6. Channel Coding: Part 1.
Waveform Coding. Types of Error Control. Structured Sequences. Linear Block Codes. Error-Detecting and Correcting Capability. Usefulness of the Standard Array. Cyclic Codes.Well-Known Block Codes.
7. Channel Coding: Part 2.
Convolutional Encoding. Convolutional Encoder Representation. Formulation of the Convolutional Decoding Problem. Properties of Convolutional Codes. Other Convo lutional Decoding Algorithms.
8. Channel Coding: Part 3.
Reed-Solomon Codes. Interleaving and Concatenated Codes. Coding and Interleaving Applied to the Compact Disc Digital Audio System. Turbo Codes.
Appendix 8A. The Sum of Log-Likelihood Ratios.
9. Modulation and Coding Trade-Offs.
Goals of the Communications System Designer. Error Probability Plane. Nyquist Minimum Bandwidth. Shannon-Hartley Capacity Theorem. Bandwidth Efficiency Plane. Modulation and Coding Trade-Offs. Defining, Designing, and Evaluating Systems. Bandwidth-Efficient Modulations. Modulation and Coding for Bandlimited Channels. Trellis-Coded Modulation.
10. Synchronization.
Introduction. Receiver Synchronization. Network Synchronization.
11. Multiplexing and Multiple Access.
Allocation of the Communications Resource. Multiple Access Communications System and Architecture. Access Algorithms. Multiple Access Techniques Employed with INTELSAT. Multiple Access Techniques for Local Area Networks.
12. Spread-Spectrum Techniques.
Spread-Spectrum Overview. Pseudonoise Sequences. Direct-Sequence Spread-Spectrum Systems. Frequency Hopping Systems. Synchronization. Jamming Considerations. Commercial Applications. Cellular Systems.
13. Source Coding.
Sources. Amplitude Quantizing. Differential Pulse-Code Modulation. Adaptive Prediction. Block Coding. Transform Coding. Source Coding for Digital Data. Examples of Source Coding.
14. Encryption and Decryption.
Models, Goals, and Early Cipher Systems. The Secrecy of a Cipher System. Practical Security. Stream Encryption. Public Key Cryptosystems. Pretty Good Privacy.
15. Fading Channels.
The Challenge of Communicating over Fading Channels. Characterizing Mobile-Radio Propagation. Signal Time-Spreading. Time Variance of the Channel Caused by Motion. Mitigating the Degradation Effects of Fading. Summary of the Ke y Parameters Characterizing Fading Channels. Applications: Mitigating the Effects of Frequency-Selective Fading.
A. A Review of Fourier Techniques.
Signals, Spectra, and Linear Systems. Fourier Techniques for Linear System Analysis. Fourier Transform Properties. Useful Functions. Convolution. Tables of Fourier Transforms and Operations.
B. Fundamentals of Statistical Decision Theory.
Bayes' Theorem. Decision Theory. Signal Detection Example.
C. Response of a Correlator To White Noise.D. Often-Used Identities.E. s-Domain, z-Domain and Digital Filtering.F. List of Symbols.G. SystemView by ELANIX Guide to the CD.Look this: The Practice of Public Relations or Sustainable Landscape Construction
Sensemaking in Organizations
Author: Karl E Weick
Finalist for the George Terry Award sponsored by the Academy of Management "This lovely and important book is the clearest, most complete, and interesting statement of sensemaking in organizations available. . . . It will have an impact on both new and experienced scholars." --Bob Sutton, Stanford University "Weick is artful. He masterfully constructs the sensemaking theoretical framework so that it can be better understood by the general scholar and in the process provides the reader with the sensemaking experience." --Kathleen Sutcliffe, University of Minnesota The teaching of organization theory and the conduct of organizational research have been dominated by a focus on decision making and the conception of strategic rationality. The rational model, however, ignores the inherent complexity and ambiguity of real-world organizations and their environments. Karl E. Weick's new landmark volume, Sensemaking in Organizations, highlights how the "sensemaking" process- -the creation of reality as an ongoing accomplishment that takes form when people make retrospective sense of the situations in which they find themselves--shapes organizational structure and behavior. Some of the topics Weick thoroughly covers are the concept, uniqueness, historical roots, varieties and occasions, general properties, and the future of sensemaking research and practice. Expertly written, Sensemaking in Organizations is the volume that students, scholars, and professors of organization and management studies must have.
Booknews
Weick (organizational behavior and psychology, U. of Michigan) shows how the "sensemaking" process--the creation of reality as an ongoing accomplishment when people make retrospective sense of the situations in which they find themselves--shapes organizational structure and behavior, expanding the rational model of organization theory to include the complexity and ambiguity of real-world organizations and their environments. Paper edition (unseen), $18.95. Annotation c. Book News, Inc., Portland, OR (booknews.com)
Table of Contents:
| Introduction to the Series | ||
| Preface | ||
| 1 | The Nature of Sensemaking | 1 |
| 2 | Seven Properties of Sensemaking | 17 |
| 3 | Sensemaking in Organizations | 63 |
| 4 | Occasions for Sensemaking | 83 |
| 5 | The Substance of Sensemaking | 106 |
| 6 | Belief-Driven Processes of Sensemaking | 133 |
| 7 | Action-Driven Processes of Sensemaki ng | 155 |
| 8 | The Future of Sensemaking | 169 |
| References | 198 | |
| Author Index | 218 | |
| Subject Index | 225 | |
| About the Author | 231 |
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