Good morning, I am working in digital communications specifically with dpsk modulation in gnu radio. I made a very simple dpsk modulation and demodulation testing flow graph . this is the flow graph that I made for the transmitting part:
https://picasaweb.google.com/101968292957887487468/DQPSKMODULATION#5733510080875799138 And the transmitted spectrum, before the UDH USRP1 sink block is : https://picasaweb.google.com/101968292957887487468/DQPSKMODULATION#5733510073889925042 And for the receiver I did this: https://picasaweb.google.com/101968292957887487468/DQPSKMODULATION#5733510072472332802 I receive this spectrum after the UHD-USRP1 source block: https://picasaweb.google.com/101968292957887487468/DQPSKMODULATION#5733510074110374626 I hope to see any spectrum there! Also I hope to see a kind of cosine signal in the scope at the final of the flow graph but I see nothing! I dont know what I am doing wrong. I am transmitting 16 samples/symbol with a symbol rate of 125 ksymbols/seg which is equal to a sample rate of 2 Msamples/s at the TX and RX UHD - USRP block.The center frequency of the UHD-USRP1 block was set at 2.4 GHz because the daughter board is a RFX 2400. Also when I run this program, I can see in the terminal : UOUOOUOUOUOUOUOUOUOUOUOUOUOUOUOUOUOUOUOUO Please, I hope anyone can help me. I have working on this for a long time and I dont know what else to do. Thanks!!
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