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[SOLVED] IQ demodulation for BPSK signals

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vreg

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Hi,

Can someone explain or provide a reference to how separating the received signal into IQ can help demodulation of BPSK signals?

IQ demodulation makes sense for amplitude modulated systems since I^2 + Q^2 gives you the amplitude and you can decode the signal without worrying about phase rotation. But how does it help in BPSK demodulation where only the phase is different and amplitude is same?

Thanks.
 

A standard method to demodulate BPSK signals is a costas loop PLL. It uses IQ signal components as input.
 
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