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 .
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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