Q7. Assume that an alien species have a speech signal that has frequency components from 400Hz...

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Q7. Assume that an alien species have a speech signal that has frequency components from 400Hz to 3000Hz. HODI Din -20000 40000 20000 m/t) A two user transmission system with two speech message signals mi(t) and m(t) that make use of DSB-SC using carriers cos(2n fit) and cos(2n fit), as given below. They want to transmit their speech signals through the transmission channel given above. (You can assume f> fi.) Marel u(t)= cas (1.4) K [VSB(f) Vitt lafel re) Cos(infue) i) Determine conditions for fi and f to be able to recover the message signals of both users. Draw the frequency response of u(f), where u(t)= u₁(f)+uz(t). ii) Design a receiver to recover mi(f) and m₂(t). b) Assume KDSB-SC modulated signals, u(t), for k=1.....K. 1) Determine the number of maximum value of K that can transmit their messages through the channel H(f) in a noise free environment. ii) How would you select their carrier frequencies? Draw the frequency response of u(t), where 40000 Uk (t) f(Hz) c) Determine the number of maximum users (K) that can be supported if SSB is used to modulate u(t), for k=1.....K What are their carrier frequencies? d) Now consider the filter below to generate VSB modulated signals. Calculate the number of maximum users (K) that can communicate. What are their carrier frequencies? a La --3000-4-1000- +1000 -1000 +1000 +3000 FORO Q7. Assume that an alien species have a speech signal that has frequency components from 400Hz to 3000Hz. HODI Din -20000 40000 20000 m/t) A two user transmission system with two speech message signals mi(t) and m(t) that make use of DSB-SC using carriers cos(2n fit) and cos(2n fit), as given below. They want to transmit their speech signals through the transmission channel given above. (You can assume f> fi.) Marel u(t)= cas (1.4) K [VSB(f) Vitt lafel re) Cos(infue) i) Determine conditions for fi and f to be able to recover the message signals of both users. Draw the frequency response of u(f), where u(t)= u₁(f)+uz(t). ii) Design a receiver to recover mi(f) and m₂(t). b) Assume KDSB-SC modulated signals, u(t), for k=1.....K. 1) Determine the number of maximum value of K that can transmit their messages through the channel H(f) in a noise free environment. ii) How would you select their carrier frequencies? Draw the frequency response of u(t), where 40000 Uk (t) f(Hz) c) Determine the number of maximum users (K) that can be supported if SSB is used to modulate u(t), for k=1.....K What are their carrier frequencies? d) Now consider the filter below to generate VSB modulated signals. Calculate the number of maximum users (K) that can communicate. What are their carrier frequencies? a La --3000-4-1000- +1000 -1000 +1000 +3000 FORO

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