Re: [Discuss-gnuradio] Audio File transmission using Qpsk modulation

[Jeff Long]

A USRP doesn't work at 15k S/s, and your audio sink probably doesn't 
work at 120k. On the TX side you have 2 different blocking sinks (audio 
and USRP) which can mess things up. Not sure about the rest of it. It 
seems like there might be some filtering and oversampling missing.

On 05/10/2018 12:52 PM, JONNY LEYIKUN wrote:
> Dear All
>
> I try to  transmit Audio File using QPSK modulation and Raised cosine 
> waveform on GNU radio platform
> I can transmit a clear audio file, constellation sink, and amplitude 
> graph. but when I try to receive using another Laptop the USRP cannot 
> receive the transmit signal so  I cannot hear the audio file
> see the file here and please help me if I made a mistake
>
> 1.even The USRP transmitter give red light and also the USRP receiver 
> side gives the green light  but I don't know why
>
>
>
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio