On Mon, Feb 24, 2014 at 11:22 PM, Tom Rondeau <t...@trondeau.com> wrote:
> On Mon, Feb 24, 2014 at 12:36 AM, Alick Zhao <alick9...@gmail.com> wrote: > > On 02/24/2014 12:33 AM, YiZiRui Zhou wrote: > >> Hello everyone, > >> > >> > >> I'm a graduate student from China. I major in Computer Science and my > >> research focus on wireless networks. Today, I'm glad to share some of my > >> ideas on MIMO with you. (maybe a little pleonastic) > >> > > > > Nice to see a Chinese face here :) > > > >> > >> PS: I work on this project for both study and research purpose, before > >> it I have gone through many relative papers and tutorials on how to > >> build a MIMO system in GNU Radio. So I feel that implementing a MIMO > >> system in GNU Radio is feasible. Nevertheless, I have to treat it > >> cautiously since it is really complicated to make it work. Now, I have > >> already built an elementary MIMO node with two USRPs (figure of the AP > >> is attached to the end of the Email) and I'm working on a new module > >> (gr-mimo) based on tx_ofdm.grc and rx_ofdm.grc to implement uplink > >> transmission. The next step is to debug and test the uplink > >> transmission. Since there is no gr-mimo standard module in GNU Radio, I > >> guess this project might be useful to GNU Radio beginners. If it has the > >> honor of being involved in Google Summer of Code(GSoC) 2014, that would > >> be fantastic. Anyway, I am eager to get some insights from you. :-) > >> > > > > Since you have done a lot of research, you should feel *confident* it is > > feasible. I was involved in a MIMO project when I was doing my bachelor > > thesis about two years ago, and we implemented a 2x2 MU-MIMO system with > > CSI feedback and transmit precoding on USRP and GNU Radio. However, it > > only implements downlink transmission and lacks of OFDM (so just narrow > > band). Nevertheless it proved the feasibility. Unfortunately we hadn't > > furthered that research since then. It's really glad to see you want to > > explore it tightly with upstream. I attach the link to my thesis report > > (it is in Chinese) below, and hopefully you will find something helpful. > > > > [1] > > > http://cloud.alick.me/public.php?service=files&t=0a67a7f2d09a1b4385dc85018d487918 > > > > Regards, > > -- > > Alick > > Fedora release 20 (Heisenbug) user > > https://fedoraproject.org/wiki/User:Alick > > > Yes, and Matt Ettus and I proved that we could to 2x2 MIMO OFDM with > GNU Radio on USRPs a number of years ago (there was not reason to > think that we couldn't; just had to be done). Our code, though, was a > complete mess and fragile at the time. It's even more obsolete now > that we've replaced the OFDM layer. Which is why it's time to get this > done properly in GNU Radio. > > Tom > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > Hi Tom, As far as I am concerned, plenty of work has done on MIMO. While both of the software(GNU Radio) and the hardware(USRP) are developing fast, many of the source codes are not compatible. So, maybe I have to do this work from the beginning, while former works are still instructive. Do you think I should add this idea to the GR GSoC website? Thanks, Zhou
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