The Mobile Communications Handbook

Mobile Communications Contents
PART I 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Basic Principles

Complex Envelope Representations for Modulated Signals Leon W. Couch, II Sampling Hwei P. Hsu Pulse Code Modulation Leon W. Couch, II Baseband Signalling and Pulse Shaping Michael L. Honig and Melbourne Barton Channel Equalization John G. Proakis Line Coding Joseph L. LoCicero and Bhasker P. Patel EchoCancellation Giovanni Cherubini Pseudonoise Sequences Tor Helleseth and P. Vijay Kumar Optimum Receivers Geoffrey C. Orsak Forward Error Correction Coding V.K. Bhargava and I.J. Fair Spread Spectrum Communications Laurence B. Milstein and Marvin K. Simon Diversity Arogyaswami J. Paulraj Digital Communication System Performance Bernard Sklar Telecommunications Standardization Spiros Dimolitsas andMichael Onufry

PART II 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34

Wireless

Wireless Personal Communications: A Perspective Donald C. Cox Modulation Methods Gordon L. St¨ ber u Access Methods Bernd-Peter Paris Rayleigh Fading Channels Bernard Sklar Space-Time Processing Arogyaswami J. Paulraj Location Strategies for Personal Communications Services Ravi Jain, Yi-Bing Lin,and Seshadri Mohan1 Cell Design Principles Michel Daoud Yacoub Microcellular Radio Communications Raymond Steele Fixed and Dynamic Channel Assignment Bijan Jabbari Radiolocation Techniques Gordon L. St¨ ber and James J. Caffery, Jr. u Power Control Roman Pichna and Qiang Wang Enhancements in Second Generation Systems Marc Delprat and Vinod Kumar The Pan-European Cellular System Lajos Hanzo Speechand Channel Coding for North American TDMA Cellular Systems Paul Mermelstein The British Cordless Telephone Standard: CT-2 Lajos Hanzo Half-Rate Standards Wai-Yip Chan, Ira Gerson, and Toshio Miki Wireless Video Communications Madhukar Budagavi and Raj Talluri Wireless LANs Suresh Singh Wireless Data Allen H. Levesque and Kaveh Pahlavan Wireless ATM: Interworking Aspects Melbourne Barton, MatthewCheng, and Li Fung Chang
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Wireless ATM: QoS and Mobility Management Bala Rajagopalan and Daniel Reininger An Overview of cdma2000, WCDMA, and EDGE Tero Ojanper¨ and Steven D. Gray a

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1999 by CRC Press LLC

Couch, II, L.W. “Complex Envelope Representations for Modulated Signals” Mobile Communications Handbook Ed. Suthan S. Suthersan Boca Raton: CRCPress LLC, 1999

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1999 by CRC Press LLC

Complex Envelope Representations for Modulated Signals
1

Leon W. Couch, II
University of Florida

1.1 Introduction 1.2 Complex Envelope Representation 1.3 Representation of Modulated Signals 1.4 Generalized Transmitters and Receivers 1.5 Spectrum and Power of Bandpass Signals 1.6 Amplitude Modulation 1.7 Phase and Frequency Modulation 1.8 QPSKSignalling Defining Terms References Further Information

1.1

Introduction

What is a general representation for bandpass digital and analog signals? How do we represent a modulated signal? How do we evaluate the spectrum and the power of these signals? These are some of the questions that are answered in this chapter. A baseband waveform has a spectral magnitude that is nonzero forfrequencies in the vicinity of the origin (i.e., f = 0) and negligible elsewhere. A bandpass waveform has a spectral magnitude that 0), is nonzero for frequencies in some band concentrated about a frequency f = ±fc (where fc and the spectral magnitude is negligible elsewhere. fc is called the carrier frequency. The value of fc may be arbitrarily assigned for mathematical convenience in some problems. Inothers, namely, modulation problems, fc is the frequency of an oscillatory signal in the transmitter circuit and is the assigned frequency of the transmitter, such as 850 kHz for an AM broadcasting station. In communication problems, the information source signal is usually a baseband signal—for example, a transistor-transistor logic (TTL) waveform from a digital circuit or an audio (analog)...