Mobile Communications Handbook, 3rd Edition

4

Complex Envelope Representations for Modulated Signals^*

 

     Leon W. CouchII

4.1 Introduction

4.2 Complex Envelope Representation

4.3 Representation of Modulated Signals

4.4 Generalized Transmitters and Receivers

4.5 Spectrum and Power of Bandpass Signals

4.6 Amplitude Modulation

4.7 Phase and Frequency Modulation

4.8 QPSK Signaling

4.9 OFDM Signaling

Reference

Further Reading

4.1 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 answered in this chapter.

A baseband waveform has a spectral magnitude that is nonzero for frequencies in the vicinity of the origin (i.e., ...