4. A Manchester encoder maps a bit 1 into 10 and a zero 0 into 01. The signal waveforms corresponding to the Manchester code are shown below. Determine the probability of bit error if the two signals are equally probable and are corrupted by additive zero- mean white Gaussian noise with an auto-correlation function: A s₁(t) (t)=\8(z). s₂(t) A A -A t -A T