yolande_yj
Full Member level 3
costas loop bpsk
I searched some papers and books about BPSK demodulation using Costas loop. I am very confused how it works. I attached all the Costas loops below. They are not consistent though. You can see some one extract the data from the I branch while others from Q branch. Someone give 90 degree phase shift for I while others give it to Q branch.
In Image4.jpg, the hard limit costas loop, at each point, which one is bipolar digital waveform and which one is not? Actually how is the waveform at each branch look like?
I searched some papers and books about BPSK demodulation using Costas loop. I am very confused how it works. I attached all the Costas loops below. They are not consistent though. You can see some one extract the data from the I branch while others from Q branch. Someone give 90 degree phase shift for I while others give it to Q branch.
In Image4.jpg, the hard limit costas loop, at each point, which one is bipolar digital waveform and which one is not? Actually how is the waveform at each branch look like?