I have created a dqpsk transceiver with two usrp2 boards. This is my
flow graph in GRC.
vector source -> packet encoder -> dpsk modulator(-m dqpsk,
4samples/symbol) -> constant multiplier (*0.1) -> UHD-USRP sink
UHD-USRP source -> Low pass filter (Hann window) -> dpsk demodulator ->
packet decoder -> file sink
When i run the graph, I dont receive anything at the file sink. If I
remove packet encoder and decoder, i do receive transmitted vector with
few errors. What is this problem? May I know what packet encoder and
decoder doing exactly?
Even if the demodulated data are wrong, i’m still expecting something at
packet decoder. If i just connect modulator to demodulator, it’s working