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From: | Valerio, Danilo |
Subject: | Re: [Discuss-gnuradio] Symbol rates. USRP2 vs USRP1 |
Date: | Thu, 23 Apr 2009 10:25:34 +0200 |
User-agent: | KMail/1.11.2 (Linux/2.6.27-14-generic; KDE/4.2.2; x86_64; ; ) |
Hi Colby! [In your bbn_80211b_rx.py (line 98)] In fact, with USRP1: 2 * [64 MS/s / (4 S/bit * 32)] = 1 Mbps Therefore, in order to transmit at 1 Mbps, we need to set the (spb*interp_rate) accordingly: 2 * [100 MS/s / (4 S/bit * 48)] = 1Mbps. We have tried some different combinations of spb and interp_rate (e.g. spb=8 and interp=24), so that the result is always 1 Mbps. But we still have no success. By "no success", I mean that the wifi chipset monitoring the air receives frames that seem to be randomly generated. Anyway, thanks for uploading your branch. ;-) > Hi all, > > As some of you know, I am working on porting the BBN 802.11b code to the > USRP2. I understand that the ADC/DAC rates are higher than the USRP1. What > are the effects, if any, on the rate at which symbol are sent through the > air? I am suspect that this could be the reason I cannot decode sent > packets. > > Colby > |
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