b) (8 marks) Given a two-branch diversity combining receiver. The channel of each diversity branch takes a value of I with probability of 0.8, and takes a value of 0.I with a probability of 0.2. The two branches are independent. The modulation used is DPSK, ( P..DPSx [Gaussian ] = =e") and y = E, IN. = 20 1) (3 marks) Determine the average error probability of a maximum ratio combining diversity receiver (MRC). ii) (5 marks) Determine the average error probability of a "selective-diversing" receiver. Compare the two results