Consider we have received a QPSK signal. We than make I (In phase) and Q (quadrature component) which I understand is nothing but multiplying the received signal by the cos(2*pi*f) and -sin(2*pi*f) Where f is the carrier frequency. Is this creation of I and Q is matched filter or there is some other filtering we do which is termed as matched filtering. I will appreciate any clarification?
Edit: Is it that we use some matched filter on I and Q data. What matched filter we use depends on the transmitter characteristic?