Q19. i) Explain any two digital signal processing techniques used in digital communication system. ii) A communication system is represented by the gains A1,A2,A3,A4 as shown in Figure B1. The output...

Extracted text: Q19. i) Explain any two digital signal processing techniques used in digital communication system. ii) A communication system is represented by the gains A1,A2,A3,A4 as shown in Figure B1. The output power Poutput is 36dB and Pinput is 42dB. Pinput Poutput A1 A2 АЗ A4 Figure B1 a) Check whether the system is working as amplifier or attenuator. Justify your answer. b) Find the value of gain A3 if Al=A2=6 and A4=0.75.