Abstract
This chapter presents a design of the quadrature amplitude modulation (QAM) transmitter and receiver in Simulink and obtains the bit error rate (BER) graphs through simulation. The block Rectangular QAM Modulator Baseband provided in Simulink takes the input of a row vector composed of log 2 M bits and outputs the two-dimensional coordinates of QAM symbols in the two-dimensional vector space. A QAM signal received through an additive white Gaussian noise (AWGN) channel can be converted into a point in the 2-D vector space. The MATLAB function berawgn() can be used to calculate the theoretical BER of various modulation and demodulation methods. The chapter then compares the BER graphs obtained through simulation with the theoretical BER, describes the conversion of the pulse-shaped QAM signal into an electrical signal, and observes the signal trajectory using an oscilloscope. It is designed to help teach and understand communication systems using a classroom-tested, active learning approach.
Published Version
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