Consider the STTC in Figure 6.3 when there is only one receive antenna. Assume a transmitted codeword that stays at state zero at all time.
(a) For the error event paths with length two, find the formulas for the pairwise error probability (PEP).
(b) For each error event of length two, calculate the corresponding number of bit errors.
(c) Calculate an approximation to the average bit error probability by only considering the error events of length two.
