Hi Mehtap, please answer on the list. The purpose of gr-eventstream is exactly to enable what you're trying.
Best regards, Marcus On Mon, 2019-05-13 at 15:40 +0300, mehtap özkan wrote: > Thank you Marcus, > I have looked at gr-eventstream and found it useful for bursty transmissions > not continous ones. > Maybe there is a way to produce '0's and add/ xor them with real data? > Any advice on that? > > Müller, Marcus (CEL) <muel...@kit.edu>, 13 May 2019 Pzt, 15:23 tarihinde şunu > yazdı: > > Dear Mehtap, > > > > On Mon, 2019-05-13 at 15:03 +0300, mehtap özkan wrote: > > > Dear All, > > > I have implemented a CPFSK transmitter succesfully using GNU RADIO. > > > > Cool! > > > > > The blocks are PRBS Source->Scrambler (G3RUH)-> CPFSK Mod-> UHD Sink. The > > > reference HW receiver receives and demodulates the signal quite well. > > > > It's always a nice feeling when something works with real hardware :) > > > > > > > > Then I remove the PRBS Source and place a UDP Source+UART block as the > > > data source. > > > When the connected client sends continous data, everything is fine > > > (except at the start of transmission where the receiver needs time to > > > lock to the incoming signal). > > > When I send some bytes from the client and stop sending, the transmission > > > becomes burst-like and the receiver can demodulate pretty much nothing. > > > I found the culprit which is the Scrambler, when there is no input to the > > > Scrambler, there is no output, so there is no RF output. > > > > Well, I wouldn't call it a "culprit", since it does what it's designed > > to do: Scramble data. > > > > > I have also developed a FPGA Continous CPFSK transmitter in the past and > > > the scrambler there was producing output every clock cycle as there was 0 > > > in its Input, so that guaranteed continous output. > > > The real problem is: What should I do to force some Input bits to the > > > Scrambler, even there is no real data? > > > > The gr-eventstream module might be of interest to you! > > > > Best regards, > > Marcus > >
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