In a quaternary communication system, one of the four signals s1(t) = 0s2(t) = Ac cos(2πfct)s3(t) = Ac sin(2πfct)s4(t) = Ac cos(2πfct) + Ac sin(2πfct) is transmitted during the interval 0 ≤ t ≤ T, T = n/fc where n is a positive integer. All signals are equal to 0 outside 0 ≤ t ≤ T. The transmitted signal goes through an additive white Gaussian noise channel with zero mean and power spectral density N0/2. Calculate the nearest neighbor hound for the probability of symbol error incurred by the optimum receiver.

Agas contained within a piston-cylinder assembly e end nation about same energy states, 1 and 2, where pi 10 bar, v undergoes two processes, a and b, between the sam 0.1 m3, ui-400 kj and p2 1 bar, v2 1.0 m2, u2 200 kj: process a: process from 1 to 2 during which the pressure- volume relation is pv constant process b: constant-volume process from state 1 to a pressure of 2 bar, followed by a linear pressure-volume process to +20 0 state 2 kinetic and potential energy effects can be ignored. for each of the processes a and b, (a) sketch the process on p-v coordinates, (b) evaluate the work, in kj, and (c) evaluate process the heat transfer, in kj