Consider the 7-bit Barker code, designated by the sequence \(x(n)\). (a) Compute and plot the autocorrelation of this code. (b) A radar uses binary phase-coded pulses of the form \(s(t)=r(t) \cos \left(2 \pi f_{0} tight)\), where \(r(t)=x(0)\) for \(07 \Delta t\).