Hello Evariste:
You can use Ettus Research's MIMO cable if you want to connect two USRP N200/N210s (with same daughterboards) to form a 2x2 MIMO system (see: https://kb.ettus.com/Synchronization_and_MIMO_Capability_with_USRP_Devices) . LimeSDR, XTRX, and USRP B210 have 2x2 MIMO capabilities to begin with, so you do not need to use additional tools like MIMO cables in order to set up a MIMO system if you are happy with a 2x2 transceiver. All you need is a single unit of LimeSDR, XTRX, or USRP B210. Please note that they are a bit different from the USRP N200-based setup in that they share one LO on multiple channels (=provides phase coherence, but prevents you from tuning to two multipe frequencies simultaneously). Also, please note that USRP B210 is a bit easier to use than the cheaper alternatives (in my opinion), although LimeSDRs are not too bad either, considering the cost difference. For LimeSDR, please check out https://discourse.myriadrf.org/ and https://discourse.myriadrf.org/search?q=MIMO . Regards, Kyeong Su Shin ________________________________ 보낸 사람: eva some <[email protected]> 보낸 날짜: 2019년 6월 15일 토요일 오전 12:48:54 받는 사람: Kyeong Su Shin 참조: [email protected] 제목: Re: [Discuss-gnuradio] Hardware for MIMO & Beamforming Experiment Thank you Kyeong, I am working on a publication paper (personal work) which involves MIMO stuff. I think I will go with LimeSDR which seems cheaper. For a 2x2, can we still use Ettus MIMO Cable? If not, how the configuration plays out? Any links for reading will be much appreciated. Thank you, Eva On Thu, Jun 13, 2019 at 9:11 PM Kyeong Su Shin <[email protected]<mailto:[email protected]>> wrote: Hello Evariste: If 2 channels are sufficient, you can probably get away with USRP B210s (which is expensive but superior) or LimeSDRs. You can also use a MIMO cable to pair up two USRP N210s together. If you need more channels, things get a bit expensive. You will need to consider USRP N3xx series or hook up multiple SDR transceivers together. The cheapest way that I can think of is implementing your own master clock generator and clock divider (A bit riskier than using Ettus's Octoclock, though). I would use LimeSDRs or XTRXs for 2x2 MIMO setup if it is a personal project. I would ask for more budgets (and take Ali Dormiani's approach) if it is a serious research funded by an organization. (* Please note that devices like USRP B210 have one shared LO for multiple channels. That means you cannot physically tune to different frequencies simultaneously, but you get phase coherence between the channels. The MIMO Cable + USRP N210 configuration is the other way around.) Regards, Kyeong Su Shin ________________________________ 보낸 사람: eva some <[email protected]<mailto:[email protected]>> 대신 Discuss-gnuradio <[email protected]<mailto:[email protected]>> 보낸 날짜: 2019년 6월 14일 금요일 오전 3:30:34 받는 사람: [email protected]<mailto:[email protected]> 제목: [Discuss-gnuradio] Hardware for MIMO & Beamforming Experiment Hi dear community members! I want to run experiments using MIMO and/or beamforming techniques with open source. However, I am getting stuck with hardware. Traditionally, I used USRPs N210 for experiments. I have only two. Is there any cheap hardware that can support MIMO & beamforming applications on the market? Thanks. -- Evariste Some EE -- Evariste Some Temple College of Engineering, Master EE
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