On Wed, Oct 8, 2014 at 11:12 PM, Hoang Ngo-Khac < khachoang1...@outlook.com.vn> wrote:
> Dear all, > > I am checking FEC Extended Encoder/Decoder in gnuradio-3.7.6 and would > like to embed it in my OFDM transmission. > > First, I run the flowgraph below. It works and I can see how FEC improve > the results. > > > > However, when I change some blocks, for example, using BPSK Mapper (as > below), it throws me the error: > > > terminate called after throwing an instance of 'std::invalid_argument' > what(): destination already in use by edge > deinterleave0:0->fec_encoder0:0 > > > > > > When I modify the flow graph, this error happen regularly even when the > new > inserted block is not connected dirrectly to Encoder or Decoder block. > To make FEC work with my OFDM transmission, I need to make the Encoder and > Decoder work compatibly with my blocks. But as you can see, it stops > working with when I insert BPSK Mapper to the flow graph, let alone more > complicated blocks like OFDM Modulation. > > Please help me to figure out the problem and fix it. Any clue would be > appreciated. > > Best, > Hoang Ngo > I'm assuming that BPSK Mapper is your own block? I'm wondering if there's anything in there that would cause this problem. Connecting one block instead of another should not cause any different behavior in the preceding block. For the encoder and decoder objects, are you defining them with any level of parallelism? Tom
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