Video Streaming Issue (most probably at receiving end)

Hi Members,

I am trying to transmit a video stream over the wireless network between

two host computers. For transmission and reception USRP N200 is used on

both computers. The gnuradio version is 3.7.2.1.

I have checked the transmission part, which is working perfectly by

transmitting a video stream over the wireless. Whereas, no video

reception is displayed on receiver end.

For further reference, I have attached the flow charts used for

transmission and reception of video streaming. An earliest reply is

highly appreciated.

Regards,

Syed Aqeel R.

Please ask these questions on the mailing list.

On 02/03/2014 12:44 PM, Syed Aqeel R. wrote:

Hi Martin,

Again, I did some more work and the details are as under.

  1. I have created a single flowgraph without USRP hardware. For your
    reference the file is enclosed with the name of
    gmsk_file_transceiver.grc. This work fine and we can see the stream
    video output without any difficulty.

This does not mean your flowgraphs are working. I haven’t been able to
check them, but there’s many things that can go wrong over the air which
won’t in a simulation.

  1. To continue further I splitted the above mentioned file into
    transmitter and receiver side along with the inclusion of USRP source
    and sink blocks, respectively. Their flowgraphs are enclosed with the
    name of gmsk_tx.grc and gmsk_rx.grc, respectively. The FFT plot shows
    that (vdo transmission.png enclosed) transmitter and receiver handshakes
    with each other but the signal difference between the transmitter and
    the receiver side is 80 dB. I further noticed that whenever I stopped
    the transmission the received signal at the receiver further drops to
    -120 dB.

You are working with relative power levels here, so the dB values don’t
mean that much.

Martin

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