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This is a coherent demodulation of a BPSK signal. I'm using this link as a reference

However my demodulated output comes out with too many redundant values compared to the transmitter. This only happens when the data bit is zero. enter image description here

The Blue ones are the demodulated data(Floor1) and the yellow ones are the transmitted data bits. Do you guys think it might be related to my low pass filter? or sampling rate? or something else?

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