(a) A BPSK system and a QPSK system are designed to transmit at equal rates; that is, two bits are transmitted with the BPSK system for each symbol (phase) in the QPSK system. Compare their symbol error probabilities versus E_s / N₀ (note that E_s for the BPSK system is 2E_b).

(b) A BPSK system and a QPSK system are designed to have equal transmission bandwidths. Compare their symbol error probabilities versus SNR (note that for this to be the case, the symbol duration of both must be the same; i.e., T_s,BPSK = 2T_b = T_s,QPSK).

(c) On the basis of parts (a) and (b), what do you conclude about the deciding factor(s) in choosing BPSK versus QPSK?