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MODERN DIGITAL AND ANALOG (现代数字和模拟)
© 2008 AGI-Information Management Consultants
May be used for personal purporses only or by
libraries associated to network.
MODERN DIGITAL AN D
ANALOG
COMMUNICATION
SYSTEMS
Third Edition
B . P. LATHI
OXPORD
UNIVERSITY PRESS
CONTENTS
PREFACE xi
1 INTRODUCTIO N /
Communication System 7
Analog and Digital Messages 3
Signal-to-Noise Ratio, Channel Bandwidth, and the Rate of Communication
Modulation 10
Randomness, Redundancy, and Coding 12
INTRODUCTION TO SIGNALS 14
2.1 Size of a Signal 14
2.2 Classification of Signals 20
2.3 Some Useful Signal Operations 24
2.4 Unit Impulse Function 28
2.5 Signals and Vectors JO
2.6 Signal Comparison: Correlation 35
2.7 Signal Representation by Orthogonal Signal Set 40
2.8 Trigonometric Fourier Series 44
2.9 Exponential Fourier Series 53
2.10 Numerical Computation of Dn 60
ANALYSIS AN D TRANSMISSION OF SIGNALS 71
3.1 Aperiodic Signal Representation by Fourier Integral 71
3.2 Transforms of Some Useful Functions 78
3.3 Some Properties of the Fourier Transform 84
3.4 Signal Transmission through a Linear System 107
3.5 Id
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