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From: | chuck lorres |
Subject: | [Discuss-gnuradio] Re: Help required tunnel.py |
Date: | Thu, 8 Jul 2010 18:17:40 +0000 |
Thanks for your reply. Well I am trying to run the tunnel.py in ofdm folder. However there is no bit rate option in it. If you have been able to successfully run it, please send me the parameters that you changed? I have tried all day to run it but to no avail. Not even a single packet is being sensed. In digital folders tunnel.py is running perfectly. Thanks. Date: Thu, 8 Jul 2010 13:07:04 -0400 Subject: Re: [Discuss-gnuradio] Re: Help required tunnel.py From: address@hidden To: address@hidden; address@hidden I finally found a setting that actually works. So the real problem I think lies in the bit rate. I had no communication whatsoever in low bit rate (~250k). I started to have unreliable comm. at 500k and at 1Mbps I got no packet drops for tunnel.py. However, even at 1Mbps I still got about 5% drops using benchmark_* (always at the end). My theory is that lower bit rate corresponds to lower signal bandwidth. I think in some mixer/filter stage the frequency offset is too large thus push all of my useful bandwidth out of the passing band. With higher bandwidth, a large path of the useful bandwidth remains in spite of the frequency offset, thus the receiver was able to pick up some thing. Lower bandwidth works fine for Chuck so he might not have the frequency offset problem. Let me know if anyone has a better explanation. Tuan On Thu, Jul 8, 2010 at 11:12 AM, chuck lorres <address@hidden> wrote:
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