Hi I have been working with Gnuradio and USRP N200 for about a month now and about all this time I have never succeeded in transmitting digital voice via USRP. My Proposed approach is like
audio source--->CVSD encoder---->OFDM mod------>rational resample to 200k------->multiply with signal source (100k)------>USRP sink on the receiver side USRP source------> multiply with signal source (100k)----------..rational resample to 48k ------->low pass filter----->OFDM demod------>CVSD decoder ------->audio sink I have also used a built in flowgraph of OFDM voice attached within where i get zero output with encoder (codec 2). If the encoder is disabled, the output works just fine. Any kind of assistance in this regard would be much appreciated. Regards ATIF JAVED
OFDM_voice.grc
Description: Binary data
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