Dear all, the OOT module gr-cdma that we have been working on with Zhe Feng is now ready (also fully documented). You can find it here:
https://github.com/anastas/gr-cdma.git An important acknowledgement: this project grew out of the DARPA SPECTRUM CHALLENGE: our team eventually dropped out of the race because of other time commitments but I and Zhe decided to finish up the design and make it publicly available since DARPA was generous enough to send us USRPs for testing etc. I am looking forward to feedback from the community and to ideas for expanding/improving the design. ======================================= For the impatient: 1) Download gr-cdma from github > git clone https://github.com/anastas/gr-cdma.git 2) Build the package > mkdir build_cdma > cd build_cdma > cmake -DENABLE_DOXYGEN=ON ../gr-cdma > make > sudo make install > sudo ldconfig 3) compile hierarchical blocks and play with built in app > cd gr-cdma/apps > gnuradio-companion & In the gnuradio-companion environment -- Load the hier block "amp_var_est_hier.grc", "cdma_tx_hier.grc", "chopper_correlator1.grc", "cdma_rx_hier.grc" and compile them making sure to reload blocks after each compilation -- Load the application "cdma_txrx.grc" and have fun Experiment with manual acq/tra, auto acq/tra, changing freq and timing offset, SNR, etc -- If you have 2 USRPs load the cdma_tx.grc and cdma_rx.grc and enjoy real-time CDMA transmission. You can also use the cdma_tx.grc and cdma_rx.grc by writting and reading to a fifo (first do > makefifo /tmp/cdma.fifo) ===================================== best, Achilleas
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