On Tue, Mar 3, 2009 at 6:51 AM, Andriy Brandis <dj...@hotmail.com> wrote: > Hi all > I'm doing the project on USRP, a digital data transmission system. I use > RFX2400 daughterboard. I want to implement something like 802.11b/g system, > but I would like to put all the modulation/demodulation work, error > detection/correction and MAC protocol on FPGA, in order to make the system > independent from PC. I will feed a data stream to the USRP and want to use > the fastest rate possible, and I want the receiver to send only some sort of > acknowledgement for the received packets (cumulative acks may be > considered). The first question is, is it possible to fit such a program on > USRP's Cyclone? As I understand, existing code takes almost all the space on > FPGA, but it's possible to remove unused parts (for ex., I don't need all > the channels) and free some space. Another question is which modulation > technique will take least space while doing the job (i need at least 25 > meters range)? And I also wonder if the multipath propagation will be a big > problem? If yes, is there an easy way to deal with it? > Any help will be appreciated! Thanx in advance for your answer
It could fit into the Cyclone. It really all depends on the bandwidth you want to use, and how efficient of an FPGA coder you are. What you are proposing requires pretty considerable skill not only in reprogramming the FPGA but also in wireless communications. Modulation, symbol rate, FEC scheme, distance, line-of-sight, transmit power - the list goes on for quite a while. These are the parameters you have to tweak to get your design to fit within the FPGA. As for multipath, you can try to use a RAKE receiver to help mitigate this as I don't think the Cyclone could really handle having an equalizer run at anything other than extremely low rates. Good luck! Brian _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
