Question

Communication system

7- What is the main function of the analog front end (why it is needed and what does it do)? 8- What are the main channel effects? 9- What is the reason for exitance of noise and where exactly it happens physically in the system? 10- Draw a block diagram that represents the channel effect. 11- Write an the expression of the received signal, y(t), given that the transmitted signal is x(t), the channel effect is h(t) and the noise is n(t) both in time and frequency domain 12- What are the two types of analog modulation systems? 13- Why do we need modulation? (list at least 2 reasons) 14- What are the two types of angle modulation? 15- Write the expression of the modulated signal Xm(t) as a function of the baseband signal x(t) and the carrier Acos(wt+O) for the cases of: (i) AM, (ii) FM, and (iii) PM

Answer 1

The-A ï) Modula)to Amplitude i) Phase modulalirm 12 T decreases the Size İhị muthp le le melulatis a phase modal adoro

5 pessi) For Fm the Souxe and da Juncdin Width 01) The set