109 attenuation and additive white 4. A certain communication channel is characterized by K 10-10The message signal that is to be Hz No noise with power-spectral density of Sn(f) = 2 transmitted...

109 attenuation and additive white 4. A certain communication channel is characterized by K 10-10The message signal that is to be Hz No noise with power-spectral density of Sn(f) = 2 transmitted through this channel is given as: m(t) 2 0.05 0.1 0.15 O -0.05 -1 and the carrier signal that willl be used in each of the modulation schemes below is c(t) 100 Cos(40000t) n(t) m(t) z(t) y(t) m(t) x(t) Channel with Receiver Transmitter attenuation of K 2 a. DSB-SC modulation, that is, x(t) = m(t).c(t). ) What are the power of the modulated (transmitted) signal x(t) (P)? (2.5 points) i) What is the power of the modulated signal at the output of the channel (P). and the bandwidth of the modulated signal ? (2.5 points) iiWhat is the signal-to-noise ratio (SNR,) at the output of the receiver? (2.5 points) b. Conventional AM modulation, that is, x(t) = 100 (1+0.5.m(t)) Cos(40000mt) i) What are the power of the modulated (transmitted) signal x(t) (P)? (2.5 points). i) What is the power of the modulated signal at the output of the channel (P), and the bandwidth of the modulated signal ? (2.5 points). ii) What is the signal-to-noise ratio (SNR,) at the output of the receiver? (2.5 points). USSB, that is, x(t) 100 m(e) Cos(40000nt)-100 m (6)Sin(40000t), where m(t) is the Hilbert transform of m(t). c. iWhat is the power of the modulated (transmitted) signal x(t) (P) 7 (2.5 points) iWhat is the power of the modulated signal at the output of the channel (P), and the bandwidth of the modulated signal 2 (2.5 points) What is the signal-to-noise ratio (SNR)at the output of the receiver ? (2.5 points)