Chapter 20

Project 11: MPSK and QAM Digital Transmitters

20.1    Theory

IN Chapter 18, we reviewed a few of the concepts involved in digital communications and developed an impulse modulated (IM), binary phase shift-keying (BPSK) transmitter. In this chapter, we will extend those concepts to increase the system’s spectral efficiency (that is, squeeze more data into the same bandwidth). The system’s spectral efficiency will be increased by adding a second dimension to the signal’s constellation diagram, similar to a two-dimensional Cartesian coordinate system in x and y. This added dimensionality will result in each symbol representing multiple bits. Specifically, we will discuss

  1. IM, quadrature phase shift-keying (QPSK) using root-raised-cosine ...

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