Chapter 21

Project 12: QPSK Digital Receivers

 

21.1    Theory

IN Chapter 20, we introduced a few of the basic techniques that can be used to generate a QPSK signal. Since there are an unlimited number of different forms and specifications associated with the generation of a QPSK signal, it should not be surprising that there are just as many variations of the receiver. In this chapter, we will introduce only one of these forms and a few of the techniques that can be used to recover the message contained within a QPSK signal.

Specifically, we will discuss a QPSK receiver that will

  1. Remove the majority of the frequency translating effects of the signal’s carrier from the incoming QPSK signal. This will be accomplished using a complex mixer ...

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