Hello Achilleas, thanks for your reply,
On Tuesday 12 June 2012 19:53:10 Achilleas Anastasopoulos wrote: > puncturing is not part of the FSM class. ok, thanks for the clarification, that caused the biggest confusion. > You can implement it as a simple memoryless device: > eg, if i want to puncture every third bit, then the device > accepts 3bits as inputs and outputs the first two. Ok, I didn't really like to map each bit to a byte, but the data rate I want to use shouldn't be that high to get into performance problems. > If you can give me more details on what exactly you want to > implement i may be able to help you out. I actually want to implement the inner coder used by DVB-S (ETSI EN 300 421, 4.4.3). But it's just a hobbyist project, so I'm not in a hurry implementing it. > Similraly, if you let me know which part of the FSM/trellis documentation > is hard to read, hopefully i will be able to help. I'm currently working on my BSc and haven't really done a lot with state machines yet, so working with machine alphabets is pretty new for me, but I guess I figured it out by now. Again, thanks for your reply. I'm pretty busy right now, but in about 2 weeks I'll have enough time to work on it again. Best regards, Clemens > -------------------- > Hi, > > I'm working on a modulator using a punctured (non-recursive) convolutional > coder based on a 1/2 rate mother code with length 7. > > However I find the documentation of gr-trellis pretty hard to read, I don't > really understand how punctuation should actually be implemented. > > Are there any additional documents or papers on designing the FSM of a > convolutional coder? > > Thanks, > Clemens
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