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Performance of BPSK vs QPSK

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anthonychua

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qpsk bandwidth

I understand that the bit error performance of BPSK and QPSK are the same. Does this mean that if I fix the transmitter power (eg. 1W), at the receiver I would be able to have the same performance, no matter whether I am using BPSK or QPSK.

Also the Es/No for QPSK is 3dB worse than BPSK. However, since the bandwidth of QPSK is half of BPSK, the noise in a QPSK receiver would also be half of BPSK. Wouldn't it negate the advantage that BPSK have over QPSK.

This is counter-intuitive, as QPSK uses half the bandwidth, and it looks like I’m would always be better off using a QPSK rather than BPSK.
 

pavan_85

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bpsk vs qpsk

well, the qpsk have more number of samples when compared with bpsk there the error rate will be low(i mean to say the error recovery will be quite good) since the channel which we use is free space the errors concept is of prime importance .
Therefore we generally prefer QPSK
 

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