2011/9/21 SongLixing <zt...@hotmail.com> > Hi, > > This is Song, a phd student in Computing School of USM. I'm using GNUraido > to do some research in wireless channel coding. I try to extract some useful > information from trellis_viterbi and then use this information as > measurement in other functions. > > Currently, I have successfully get the information I want from the function > viterbi_algorithm, which is in > /gnuradio/gr-trellis/src/lib/core_algorithms.cc, and I added one more > parameter in this function to output the information to upper > class(trellis_viterbi_s.cc). What my problems now is that, I can not add one > more output port to the gr.trellis_viterbi_s. All I want to do is that makes > gr.trellis_viterbi_s has two output ports, both are outputing float, one is > the measurement which has been caculated from viterbi_algorithm, another one > is the decoded data which is float data but I will do some convert to short > later. > > Could you give me some instructions about what I need to modify if I want > to change one output port signal block to two output ports. > > Thanks, > > Lixing Song >
Hi Song, Because this block is auto-generated from a template, you really want to edit /gr-trellis/src/lib/trellis_viterbi_X.cc.t. It looks like this block is already set up to have multiple output streams, so you'll have to work around what it's already doing to add what you want. Tom
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