Bit Error Rate of QPSK
Simulating a QPSK system is equivalent to simulating two BPSK systems in parallel. So there is no difference in bit error rate(BER). Since the simulation is at baseband we multiply the in-phase and quadrature streams by 1 and j respectively (instead of cos and sin carriers). At the receiver we just use the real and imag functions to separate the two symbol streams. The BER is the average BER of the two parallel streams. As in the case of BPSK we can show that the baseband representation (using 1 and j) is equivalent to using the passband representation (using cosine […]
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