> Extending OpenBTS to handle GPRS might be the easiest way to get > that done. WiMax would be a _big_ project.
I can tell you from experience that it's bigger than you think. I know someone who is trying to monitor just a single channel, and even the process for the OFDM pilot tones was super complicated (if you made a flow chart I'm pretty sure it'd be about 10 pages long). My experience is with the USRP1, and I think that if you are only interested in monitoring one channel (ie, not having an actively communicating receiver), then you can get by using the 8 bit sampling mode, otherwise you will have to try to work something out within the FPGA. From what I can tell, most of the space in the FPGA image is taken up by the code that lets you change the decimation/interpolation rates. If you fixed those you would free up a lot of space for you to work with (maybe do some sort of intelligent decimation by handling the OFDM on chip? You'd have to be a super HDL coder I think) Anyway, that's my (limited) wimax-on-usrp experience. Jason _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
