Instructor : Ass. Prof. Nuray AT

TA : Res. Assistant. Zafer Hüseyin ERGAN

ANADOLU UNIVERSITYDEPARTMENT OF ELECTRICAL AND ELECTRONICS

ENGINEERING

EEM 496

Communication Systems

Laboratory

Experiment 5

DIGITAL MODULATION USING SIMULINK

Date: 15.05.2010

16169230356 OSMAN GÜLERCAN

1) Purpose

The aim of this experiment is to study digitally modulated signals PAM,

PSK and QAM by using Simulink.

2) Lab Work

In this part we designed M-ary PAM, M-ary PSK(BPSK, QPSK, M-

PSK), and M-ary QAM models in Simulink. We used some of

communication sources in the communication blocksets such as

modulator, demodulator, AWGN channel; and we changed their

parameters to observe different results.

We also added the error rate calculation blockset and we displayed its

results which were error in percent, number of error bits, and numbers of

send bits.

3) Results

a) Part I: M-ary PAM

M-ary PAM for M-ary number=2

M-ary PAM for M-ary number=4

M-ary PAM for M-ary number=8

M-ary PAM for M-ary number=16

M-ary PAM for M-ary number=32

M-ary PAM for M-ary number=64

b) PART II: M-ary PSK

M-ary PSK- [BPSK] for M-ary number=2

M-ary PSK- [QPSK] for M-ary number=4

M-ary PSK- [MPSK] for M-ary number=2

c) PART III: M-ary QAM

M-ary PSK- [MPSK] for M-ary number=2

M-ary PSK- [MPSK] for M-ary number=4

M-ary PSK- [MPSK] for M-ary number=8

M-ary PSK- [MPSK] for M-ary number=16

M-ary PSK- [MPSK] for M-ary number=32

M-ary PSK- [MPSK] for M-ary number=64

4) Conclusion

In this experiment, we investigated the basic principles of digitally

modulated signals PAM, PSK and QAM using simulink. Firstly, we designed

an M-ary PAM model that includes a Random Integer Generator, M-PAM

Modulator and Demodulator, AWGN channel, Error Calculator etc. We

simulated this PAM model and noted the results by changing the value of M-

ary number 2, 4, 8, 16, 32 and 64 for each blockset. Secondly, we designed

M-ary PSK models and simulated for BPSK(M=2), QPSK(M=4) and M-

PSK(M=4, 8, 16, 32, 64). Thirdly, we designed M-ary QAM model and

observed the results for (M=4, 8, 16, 32, 64). We observed the results that

when the M-ary number increased, the error bits were also increased except

QAM. To sum up, in this laboratory, three digitally modulation method

PAM, PSK and QAM were studied by using simulink.