|Subject:||[Discuss-gnuradio] Re: GNU Radio roadmap|
|Date:||Sun, 17 Oct 2010 00:09:48 -0400|
|User-agent:||Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:18.104.22.168) Gecko/20100915 Thunderbird/3.1.4|
Yes, I was talking about the PFB blocks. Thanks.|
However, the comparison result of IIR and FIR in terms of computational efficiency is a little disappointing; I had hoped that IIR can be better.
On 10/16/2010 5:18 PM, Tom Rondeau wrote:
On Wed, Oct 13, 2010 at 1:20 PM, Andrew Ge <address@hidden> wrote:Tom, You have been doing some good work in using more efficient filters; have you integrated your code into GNU Radio code base yet? If there is a working version, could you please tell me where I can find it? Is it in the development version or in GNU Radio 3.3 release version. More importantly, which function modules are using the new filters? Thanks, AndrewAndrew, I'm not entirely sure which filter work you are talking about. If you're thinking of the polyphase filterbank stuff, all of those are in gnuradio-core/src/lib/filters/gr_pfb_*. You can see examples of all of them in gnuradio-examples/python/pfb. In fact, I'm about to push the synthesis filterbank block right now, which mostly completes the PFB blocks. There's some other IIR work that I started a while ago that's been put on hold while we get some other stuff going. Regarding these filters, they turn out to not be too much more efficient than the equivalent FIR filter; especially when you use the FFT version of the FIRs. What you get out of the IIR filters, though, is a lower group delay. Because I've been mostly concerned with speed and not group delay, when I got the numbers back from the IIR filters, it dropped lower on my list of things to complete. TomMessage: 1 Date: Sat, 9 Oct 2010 12:08:55 -0400 From: Tom Rondeau<address@hidden> Subject: Re: [Discuss-gnuradio] GNU Radio roadmap To: "Pandeya, Neel L."<address@hidden> Cc: address@hidden Message-ID: <address@hidden> Content-Type: text/plain; charset=ISO-8859-1 On Tue, Oct 5, 2010 at 7:36 PM, Pandeya, Neel L.<address@hidden> wrote:Hello: What is the roadmap for GNU Radio releases over the next 12 to 18 months?? What new features are planned?? Will the next release be a minor release (3.3.1), or major release (3.4.0)?? When is the next release planned for?? Any insight is much appreciated. Thanks. --SunilSunil, Thanks for asking. That's a fair question, and I haven't been ignoring it. The problem is, we don't have a really well-defined roadmap right now, but it's something we are working on. By "we," I'm mostly talking about Johnathan Corgan and myself. If I tried to tell you everything we are thinking about for the future, it would be a) a really long list and b) pretty incoherent. We have a few big ideas coming down the line, but it's going to take some time still, and we need a bit more time to define when we can properly role them out and in what releases. I will give you some insight into the next couple of things we want to do in the immediate future. 1. Rework the USRP-based examples to use UHD and get rid of duplication (usrp_thing.py and usrp2_thing.py) 2. Refactor the build system. This is pretty major from the developers side but hopefully fairly transparent to the user (if we do it right, of course). This will make more top-level blocks that will be mostly split out of gnuradio-core. The main purpose of this is to make libgnuradio-core hold just what you need to get the runtime engine working. We will then have a separate library for all of the signal processing blocks. We also want to move all of the digital modulation stuff (including OFDM) into its own top-level block space. This work is to help with a few issues. First, ease up the requirements for getting the runtime engine installed, and second, make it easier to understand how things interact. Exposing the second bit of information will, hopefully, allow people more easily work with the existing blocks as well as add their own. A third consequence of this move is that I want to improve the code maintenance by making unit testing procedures that exercise more of the code and make sure we don't let bit rot bite us. With the new structure, we expect to improve on the testing procedures and help make it obvious how to add your test code. There are a few other ideas coming out soon that I want to announce before December. My timeline here is due to a tutorial on GNU Radio that I am giving at the WinnForum's SDR Technical Conference. So more soon, but I hope that helps give you some clues as to where we are headed. Tom
Feng (Andrew) Ge, Ph.D.
Senior Research Scientist
Knowledge-Based Systems Department
One Telcordia Drive
Piscataway, NJ 08854
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