Can anyone help with the question below? Thanks, Vipin
> On May 4, 2018, at 12:35 AM, Vipin Sharma <[email protected]> wrote: > > Hi, > > I have a question about the Rx section of the flow graph here: > http://aaronscher.com/GNU_Radio_Companion_Collection/Audio_Modem_loop_back_test_FSK.html > > <http://aaronscher.com/GNU_Radio_Companion_Collection/Audio_Modem_loop_back_test_FSK.html>. > > The Rx section has a Binary Slicer block which feeds the Correlate Access > Code - Tag Stream block. If I understand correctly, once the predetermined > access code is detected in the data stream, the Correlate Access Code - Tag > Stream tags the Payload start with len_key2 tag so that downstream blocks now > only operate on Payload packet. > > My application needs a similar functionality but I would like the Payload to > be the input of the Binary Slicer block (as opposed to the output of the > Binary Slicer block in the link above). > > I basically don't want the sliced payload but the non-sliced version. But if > I don't slice the output of Polyphase Clock Sync block in Rx section, then > there isn't a binary (soft decision) value for Correlate Access Code - Tag > Stream to work with? What happens if I change the IO type of Correlate Access > Code - Tag Stream block to "float" type? Would it still be able to match the > access code? > > My application basically has some preamble, header and payload information. I > simply want to implement some form of basic frame synchronization mechanism > so that I can precisely define where the payload (or the frame) starts. > Without frame synchronization I am unable to do frame based (or packet based) > processing. However, note that, I want the raw I/Q samples (in float value) > to be extracted for the payload instead of the soft decision outputs as > described in the flow graph of Rx in the link above. > > How do I achieve this? > > Vipin
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