A$.$ Suppose the binary data stream $1101110011001$ is differentially encoded and then transmitted sketch each of the following codes

III.

Unipolar NRZ

II$.$ Polar RZ

$.$III.AMI $($Alternate Mark

Inversion$)$

IV$.$ Manchester

B$.$

A sinusoidally modulated ordinary $AM$ waveform is shown below.

a$.$ determine the modulation index

b$.$ determine the amplitude of the carrier which must be added to attain a modulation index of $0\mathrm{.}8$

c$.$ determine the average power for AM wave in case b

A DSB$-$SC modulated signal is transmitted over a noisy channel, with the power spectral density of the noise being as shown in figure $1.$ The message signal is presented as

$m(t)=4cos(400t)$

Determine the output signal to noise ratio of the receiver.

C$.$

assume the amplitude for the carrier is one volt.