## Digital CommunicationsAn up-to-date and comprehensive text on the rapidly expanding field of fixed and mobile communications, including data networks and packet switched systems. The aim of the book is fourfold: to develop the mathematical theory behind signal processing as used in modern digital communications systems; to extend these theoretical signalling concepts into information links which are robust in the presence of noise and other impairment mechanisms; to investigate how these transmission links can be developed into fixed and mobile data communications systems for voice and video transmission; and to develop queuing theory techniques and explore their development in small and large scale data transmission networks such as ISDN. The material is set in an appropriate historical context and a substantial number of numerical and practical examples are included in the text. Outline solutions to problems are available on the World Wide Web at http: //www.ee.ed.ac.uk/ |

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### Contents

Digital communications overview | 1 |

Part One Signals and systems theory | 19 |

Random signals and noise | 89 |

Copyright | |

18 other sections not shown

### Common terms and phrases

amplifier amplitude analogue antenna autocorrelation bandpass bandwidth baseband BFSK binary bit rate block bytes carrier CDMA channel Chapter circuit coder codeword communications systems components convolution correlation cosine data rate decision decoding defined detection diagram digital communications duobinary duobinary signalling earth station encoder equalisation equation example fading fibre Fourier transform frame frequency response function Gaussian given Hamming distance impulse response information signal input ISI free kbit/s length line code linear log2 matched filter Mbit/s mobile modulation multiplex noise power noise temperature normalised operation optical OQPSK orthogonal output packet path phase phasor pixel power spectral density probability QPSK quantisation radio random variable ratio receiver rectangular pulse represents result sampling satellite sequence shown in Figure sinusoid spectral efficiency spectrum statistically independent switching TDMA techniques transmission transmitted typically voltage waveform zero