yPSK = awgn(xPSKpn, snr, 'measured');
yDPSK = xDPSKpn;
rPSK = rxFilter(yPSK, rolloff, span, sps);
rDPSK = rxFilter(yDPSK, rolloff, span, sps);
yPSK = awgn(xPSKpn, snr, 'measured');
yDPSK = xDPSKpn;
rPSK = rxFilter(yPSK, rolloff, span, sps);
rDPSK = rxFilter(yDPSK, rolloff, span, sps);