# BPSK and QPSK have identical BER curve ?

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#### davyzhu

qpsk ber curve

Hi all,
I have build a simulation system to test my Error Correcting Code.
And now I add modulation/demodulation module.

When I apply BPSK and QPSK to system, I found their BER versus SNR curve almost identical, is it right in theory?

My code rate is 0.9, code length >10000.

BTW, I found BPSK and QPSK have identical uncoded BER versus SNR curve, is above similar?

Any suggestions will be appreciated!

Best regards,
Davy

#### Sal

##### Full Member level 4
proakis ber curve bpsk

Hi

That is true, you can check Digital Communications by John G. Proakis page 268, equation (5.2-57)

cheers

Sal

Points: 2