This book concerns digital communication. Specifically, we treat the transport of bit streams from one geographical location to another over various physical media, such as wire pairs, coaxial cable, optical fiber, and radio. We also treat multiple-access channels, where there are potentially multiple transmitters and receivers sharing a common medium. Ten years have elapsed since the Second Edition, and there have been remarkable advances in wireless communication, including cellular telephony and wireless local-area networks. This Third Edition expands treatment of communication theories underlying wireless, and especially advanced techniques involving multiple antennas, which tum the traditional single-input single-output channel into a multiple-input multiple-output (MIMO) channel. This is more than a trivial advance, as it stimulates many advanced techniques such as adaptive antennas and coding techniques that take advantage of space as well as time. This is reflected in the addition of two new chapters, one on the theory of MIMO channels, and the other on diversity techniques for mitigating fading. The field of error-control coding has similarly undergone tremendous changes in the past decade, brought on by the invention of turbo codes in 1993 and the subsequent rediscovery of Gallager's low-density parity-check codes. Our treatment of error-control coding has been rewritten to reflect the current state of the art. Other materials have been reorganized and reworked, and three chapters from the previous edition have been moved to the book's Web site to make room.

InhaltsangabePreface.- Changes from the Second Edition.- Notes to an instructor.- Introduction.- Applications of Digital Communication. Digital Networks. Digital vs Analog Communications. Plan of the Book. Further Reading.- Deterministic Signal Processing.- Signals. LTI Systems and Fourier Transforms. The Nyquist Sampling Theorem. Downconversion and Complex Envelopes. Z Transforms and Rational Transfer Functions. Signals as Vectors. Properties of the Fourier Transform. Spectral Factorization.- Stochastic Signal Processing.- Random Variables. Random Processes. Markov Chains. The Poisson Process and Queueing. Further Reading. Power Spectrum of A Cyclostationary Process. Power Spectrum of A Markov Chain. Derivation of a Poisson Process. Moment Generating Function of Shot Noise.- Limits of Communication.- Just Enough Information About Entropy. Capacity of Discrete-Time Channels. Further Reading. Asymptotic Equipartition Theorem.- Pulse-Amplitude Modulation.- Baseband PAM. Passband PAM. The One-Shot Minimum-Distance Receiver. Minimum Distance Sequence Detection. Performance Analysis in AWGN. Further Reading.- Advanced Modulation.- M-ary Modulation. Probability of Error. Orthogonal Modulation. Orthogonal Pulse-Amplitude Modulation (OPAM). Modulation with Memory. Bandwidth and Signal Dimensionality. Capacity and Modulation. Further Reading. The Generalized Nyquist Criterion.- Probabilistic Detection.- Detection of a Single Real-Valued Symbol. Detection of a Signal Vector. Known Signals in Gaussian Noise. ML Sequence Detection with the Viterbi Algorithm. A Posteriori Probability Detection with BCJR. Symbol-Error Probability for MLSD. Incoherent Detection. Shot Noise Signal with Known Intensity. Further Reading. Karhunen-Loeve Expansion. Bit-Error Probability for Sequence Detectors. BCJR Forward/Backward Recursions.- Equalization.- Optimal Zero-Forcing Equalization. Generalized Equalization Methods. Fractionally Spaced Equalizer. Transversal Filter Equalizers. ISI and Channel Capacity. Further Reading. DFE Error Propagation.- Adaptive Equalization.- Constrained-Complexity Equalizers. Adaptive Linear Equalizer. Adaptive DFE. Fractionally Spaced Equalizer. Passband Equalization. Further Reading. SG Algorithm Error Vector Norm.- MIMO Communications.- Basics of MIMO Systems. The Gaussian MIMO Channel. Memoryless MIMO Channels. MIMO Detection with Channel Memory. Further Reading. Proof of Separability Result (10.45).- Fading and Diversity.- Types of Diversity. Receiver Diversity. Performance Analysis for Rayleigh Fading. The Diversity-Interference Trade-Off. Transmit Diversity. Layered Space-Time Modems. Proof of Conservation Theorem. Bound on Pairwise Error Probability.- Error Control.- The Capacity Penalty of Binary Coding. Binary Linear Block Codes. Convolutional Codes. Low-Density Parity-Check Codes. Turbo Codes. Historical Notes and Further Reading. Linear Codes. Maximal-Length Feedback Shift Registers. Path Enumerators. Derivation of the Tanh Rule.- Signal-Space Coding.- Multidimensional Signal Constellations. Trellis Codes. Coset Codes. Signal-Space Coding and ISI. Further Reading.- Phase-Locked Loops.- Ideal Continuous-Time PLL. Discrete-Time PLLs. Phase Detectors. Variations on a Theme: VCOs. Further Reading.- Carrier Recovery.- Decision-Directed Carrier Recovery. Power of N Carrier Recovery. Further Reading.- Timing Recovery.- Timing Recovery Performance. Spectral-Line Methods. MMSE Timing Recovery and Approximations. Baud-Rate Timing Recovery. Accumulation of Timing Jitter. Further Reading. The Poisson Sum Formula. Discrete-Time Derivative.- Multiple Access Alternatives.- Medium Topology for Multiple Access. Multiple Access by Time Division. Multiple Access by Frequency Division. Multiple Access by Code Division. The Cellular Concept.- Exercise Solutions.- Index.