Consider a four-phase PSK signal represented by the equivalent low-pass signal u(t) = g(t - nT), n = 0, where I takes on one of the four possible values ±1, ±j with equal probability. The sequence of information symbols In is statistically independent.(a) Determine and sketch the power density spectrum of u(t) when 0 < t < T, otherwise g(t) = 0.The power density spectrum of u(t) can be computed as Duu(f) = |G(f)|^2, where G(f) is the Fourier transform of g(t) and Dii(f) is the power density sp
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