-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Sep 11, 2008, at 11:26 AM, Mohsen Baratvand wrote:
Guy, all I need to do is changing some parameters such as preamble, LTF, STF, modulation and etc of the OFDM transmitter and then send a predefined pattern to the OFDM receiver, then estimate the channel. So I'm not gonna pass all the information and data to PC via the USB link. Just sending some report to my PC.
It's conceivable that by putting the modulation in the FPGA, you could get 802.11a OFDM modulation to work using the USRP -- just send the data across the bus. But no one has written such a firmware image yet - -- feel free! (Disclaimer: I have no idea whether an 802.11a modulator would fit into the small FPGA on USRP1, and haven't tried).
If you want to do modulation in the host, which doesn't involve FPGA coding and might allow you to use some of the existing OFDM code, you're going to be limited by the bandwidth of the USB -- 8 MHz isn't really enough. If you used 8-bit mode to get 16 MHz of bandwidth AND used one of the low bitrate encodings, high-SNR packets MIGHT get received by a good receiver. I don't know enough about 802.11's use of OFDM to decide. Maybe Kyle or Tom has a comment here.
- -Dan -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.8 (Darwin) iEYEARECAAYFAkjJaHsACgkQy9GYuuMoUJ6QFQCgrtkB7qISfljFS4mlxfZ7+4gL gvgAn3OEN1ZhcZTGQqh/QljouhIjdiRK =ksDR -----END PGP SIGNATURE----- _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
