On Sat, Oct 14, 2006 at 01:04:43PM -0400, Dawei Shen wrote: > Dear Guys > > Thank you for helping me out with my previous question about the > general_work() function, I have done what I want with your help. Now I have > another problem, here is a fraction of the code: > > self._rcvd_pktq_B = gr.msg_queue() > self._rcvd_pktq_A = gr.msg_queue() # holds packets from the > PHY > > self.separator = gr.separator_ccc () > > self.gmsk_demod_A = gmsk2.gmsk2_demod(fg, *args, **kwargs) > self.gmsk_demod_B = gmsk2.gmsk2_demod(fg, *args, **kwargs) > self.correlator_A = gr.correlate_access_code_bb(access_code, > threshold) > self.correlator_B = gr.correlate_access_code_bb(access_code, > threshold) > > self.framer_sink_A = gr.framer_sink_1(self._rcvd_pktq_A) > self.framer_sink_B = gr.framer_sink_1(self._rcvd_pktq_B) > > fg.connect((self.fm_separator, 0), self.gmsk_demod_A, > self.correlator_A, self.framer_sink_A) > fg.connect((self.fm_separator, 1), self.gmsk_demod_B, > self.correlator_B, self.framer_sink_B) > > gr.hier_block.__init__(self, fg, self.fm_separator, None) > self._watcher_A = _queue_watcher_thread(self._rcvd_pktq_A, > callbackA) > self._watcher_B = _queue_watcher_thread2(self._rcvd_pktq_B, > callbackB) > > Here the incoming signal is the sum of two baseband, complex GMSK signals. > The block "self.separator" implements an algorithm to separate the two > complex signals, recovering the original signals. Then two GMSK decoding > streams are connected to the block, pretty much following what has been > provided.
I'm not sure what you're trying to do with gr.separator_ccc. If you're just trying to extract two different channels from the complex baseband signal from the usrp, gr.freq_xlating_fir works great. > However, my obeservation was that the two streams produce exactly the same > packets (which are supposed to be produced only by A, not B, the output of B > should be different). So could anyone help me check whether I am doing > things correctly here? Have you logged the two outputs of gr.separator_ccc into files and examined them? Are they by any chance identical? Eric _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
