Hi Marcus, Haydn. The Rader EW testbed(N31x) looks good for our project. I will consider it. I expect the next version X410 does support phase-coherent and phase-aligned. Regards,
2022年5月16日(月) 23:26 Haydn Nelson <[email protected]>: > In order to get Phase alignment in a normal fashion, circuitry has to be > in place to share the Local oscillator on the RF up and down convert chain. > The X410 is able to use a common 10MHz reference for all ADC/DACs which > would also be required for a truly phase coherent application. > The USRP X410 doesn't have that LO sharing capability built in, The USRP > N320 & USRP N321 was built with this circuitry by default. > > Depending on the performance you need we actually built a full > multi-channel phase coherent reference architecture on the USRP N320/N321, > you can learn more about that here. > > https://www.ni.com/en-us/solutions/aerospace-defense/radar-electronic-warfare-sigint/radar-ew-research-prototyping/build-radar-ew-testbeds.html > > Back to your X410 question, I believe there is a way to lock each channel > on the X410 to the 10MHZ frequency reference such that there is no > frequency difference channel to channel on the LO. > However, that doesn't guarantee a fixed phase difference channel to > channel on each initialization, I believe the SDR Product Engineering team > was looking at ways to mitigate that uncertainty through a shared digital > reset, I've forwarded this question to our product management team to > respond with more details into that research project, which is what I was > referring to on the notes you found on Ettus.com 😊 > > With that said, if you are looking for more than 4 channels (IE more than > 1x X410 radio) that might get difficult but we can have that conversation > to see what is possible, the USRP N320/N321 is the recommended radio > currently for such system configurations currently. > > Hopefully that helps. > > Haydn Nelson > Principal Solutions Marketing Manager > Wireless/Radar/EW & EOIR Test Solutions > Aerospace and Defense > +1-512-731-7251 | ni.com > > > -----Original Message----- > From: Marcus D. Leech <[email protected]> > Sent: Monday, May 16, 2022 9:11 AM > To: [email protected] > Subject: [EXTERNAL] [USRP-users] Re: Does X410 support phase-aligned and > phase-corent? > > On 2022-05-16 04:17, Mikio Fukushima wrote: > > Hi all, > > I'm considering to purchase a USRP X410 for one of research projects. > > the objective of this project is MIMO operation, I have some questions. > > > > Q1. > > Does each channel on X410 support phase-aligned and phase-corent > > operation? > It isn't meaningful to consider phase-coherence and phase-alignment on a > single channel. The phase-coherence and alignment is always with respect to > other channels. > > > > > Q2. > > Does each channel on multi X410s support phase-aligned and > > phase-corent operation? > > > > Q3. > > What is "Limited performance"? > > > > [3] Limited performance four-channel phase-coherent operation within a > > single radio is under investigation > I'm not sure what "limited performance" means, nor what the schedule for > that is, but I know that in initial release, the X410 does NOT support > mutual phase-coherence even within a single radio. > > > > > > > https://urldefense.com/v3/__https://www.ettus.com/all-products/usrp-x410/__;!!FbZ0ZwI3Qg!qK9xBuKBWusDewCqTkeFl1SjAew_36nFIxqesMafqOGheMElwp5DK15Ie-TLiYI6NBKQgznYDfh0DZ1WtHDYug$ > > > > _______________________________________________ > > USRP-users mailing list -- [email protected] > > To unsubscribe send an email to [email protected] > _______________________________________________ > USRP-users mailing list -- [email protected] > To unsubscribe send an email to [email protected] > > INTERNAL - NI CONFIDENTIAL > _______________________________________________ > USRP-users mailing list -- [email protected] > To unsubscribe send an email to [email protected] > -- 2021/09/27から新事務所に移転しました！ ================================== 福島 幹雄 (Mikio Fukushima) 株式会社ドルフィンシステム (Dolphin System Co.,Ltd) 〒171-0014 東京都豊島区池袋１－８－５ ミントロンビル５Ｆ Mail: [email protected] URL : http://www.dolphinsystem.jp/ TEL/FAX : 03-6658-4949 ==================================
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