> > > > ---------------------------------------- >> Date: Fri, 30 Jul 2010 10:19:35 -0700 >> From: dhalp...@cs.washington.edu >> To: m...@ettus.com >> CC: cepop...@hotmail.com; discuss-gnuradio@gnu.org >> Subject: Re: [Discuss-gnuradio] gnuradio land speed record? >> >> > On 07/30/2010 09:33 AM, Clark Pope wrote: >> >> >> >> I'm curious what people do with the wideband capability of the >> >> gnuradio/usrp and what is the widest bandwidth signal one can really >> >> process with available computers? >> >> >> >> What's the most anyone has recorded or processed continuously? What >> >> level of compexity was the processing? >> > >> > >> > With RAID arrays or SSDs, it isn't that hard anymore to sustain 100 MB/s >> > recording to disk. With 4 and 6 core systems and the i7 architecture you >> > can >> > get more than 5X the performance of your laptop. >> > >> > There are a lot of applications using the full 25 MHz of RF bandwidth. You >> > just need to pay a lot of attention to efficiency of your program and >> > algorithms. >> > >> >> For 'speed record' type information, you might be interested in SORA, a >> software radio project from Microsoft Research. They use different >> hardware and custom software, but the fundamentals are the same. >> >> As Matt points out, efficiency is a function of engineering. Using modern >> processors, 64-bit architecture, multicore, software LUTs, and a variety >> of other optimizations they were able to fully process 802.11g signals of >> 20 MHz bandwidth and sustain reception of 54 Mbps signals including >> Viterbi decoding, etc. I see no reason this couldn't be done with >> USRP(2) / GNU Radio... but looking at Microsoft's author list they had a >> lot of developers working pretty hard on it! >> >> There's not a ton of detail in the original paper, and what code is >> available is almost certainly not something you want to look at without >> reading the license very carefully, but here's the link to the project >> website: >> >> http://research.microsoft.com/en-us/projects/sora/ >> >> and the original paper: >> >> http://research.microsoft.com/apps/pubs/default.aspx?id=79927 >> >> Dan >> > > Thanks that's a good data point! So a huge corporation with > infinite resources tops out at about 20 MHz sustained > processing of what I would call a real world practical signal.
Their infinite resources are in fact limited by their management's mindset and inability to think clearly about the consequences of their business model, the impact of the Internet, etc. A guy like Ballmer is just a much a reason why Linux exists as is Linus himself. His rhetoric about GPL being a cancer, Linux developers are communists, etc. has provided "infinite inspiration" to the guys with limited resources. SORA may be a useful data point, but advise to carefully consider the source. -Jeff _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
