If you have not done so already, please send me an email note with potential topics and the name of your partner (if any).
Due on March 11:
All students: Problem 4.4-1.
The following questions relate to the Simulink programs am_env.mdl, am_env_filt.mdl, dsb_coh.mdl, costas_init.m, and costas_demo.mdl, which are available from the course home page under Demonstrations and Class Notes. Instructions for running the programs are given on the Web page.
- In the AM demo am_env.mdl, what are the considerations in choosing the value of the "slider gain"?
- In the DSB-SC demo dsb_coh.mdl, investigate the effect of a phase shift between the transmitter and receiver oscillator. Relate your observations to the analysis in problem 4.4-1.
- In the DSB-SC demo dsb_coh.mdl, investigate the effects of a frequency error between the transmitter and receiver oscillator. Relate your observations to the analysis in problem 4.4-1.
Due on March 23:
All students: Problems 4.5-1 (part a only) and 4.5-2 (part a only).
Graduate students: Problem 4.5-5.
Develop a Simulink program that modulates two separate messages m1(t) and m2(t) onto a single carrier frequency using quadrature amplitude modulation (QAM) as described in Section 4.4 of the Lathi text. For example, you might make m1(t) and m2(t) sine waves with different frequencies. Demonstrate the effects of frequency and phase errors on the demodulated signals, and explain your results analytically based on problem 4.4-1.
I will ask each graduate student to demonstrate their programs to the class on Tuesday, March 23.