On Mon, Sep 14, 2009 at 08:01:17PM -0700, harshal jadhav wrote: > Hi Eric, > > I have a few questions regarding MIMO + GNU RADIO. > > 1. How can i use MIMO with GRC? > > If i use one USRP sink, it considers one whole USRP board. I cannot use two > daughter boards of the same USRP board using USRP sink.
Josh is the right person to handle this part, though it's just a matter of setting up the transmit mux and interleaving the samples. > 2. In gnuradio-examples/python/usrp/fm_tx_2_daughterboards.py can i use > flex 900 boards? Yes. > I have tried implementing the example with the flex 900 board but it shows > more of noise. I changed the sinusoid signal frequency to 4000 Hz and 10000 > Hz. While running the code it asks for carrier frequency for both the > signals. I have given the frequency to 900 MHz. Your baseband frequency needs to be representable without aliasing given the baseband sample rate. With interp=400, the baseband rate is 128e6/400 = 320kS/s, so you should be able to represent anything from about -150kHz to +150kHz. For your MIMO usage, set both the side-A-tx-freq and side-B-tx-freq to the same value, say 906e6. The example multiplies the signals by 10000. Try using a smaller value for if_gain, say 4000. Eric _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
