USRP2 MIMO system implementation

Hello,
I want to implement a MIMO system using USRP2, I just have USRP2s and
MIMO cable.

  1. Do I have to use an external clock source ?
  2. I searched the maillist and found: Each USRP2 can handle 1 antenna
    with most daughterboards, or 2 if you
    have your own external RF sections connected to the USRP2 at IF.
    Does it mean I should buy “external RF sections” to use 2 antennas on 1
    USRP2? Or where can I get them?
  3. If I want to build a 2X2 MIMO system,-- 2 USRP2s, 1 MIMO cable, the
    “external RF sections” said above, – Is that enough?

Any suggestion is appreciated. Thank you…


Best regards,
Luyuan Pan

On 08/28/2012 12:19 AM, Pan, Luyuan wrote:

Hello,
I want to implement a MIMO system using USRP2, I just have USRP2s and
MIMO cable.

  1. Do I have to use an external clock source ?

No. With the mimo cable, you can share a clock reference between a pair
of devices

  1. I searched the maillist and found: Each USRP2 can handle 1 antenna
    with most daughterboards, or 2 if you
    have your own external RF sections connected to the USRP2 at IF.
    Does it mean I should buy “external RF sections” to use 2 antennas on 1
    USRP2? Or where can I get them?

You should select a daughterboard based on the desired frequency
coverage. Typically transceiver boards have 1 tx frontend and 1 rx
frontend. The TVRX2, which is RX only, has 2 rx frontends.

  1. If I want to build a 2X2 MIMO system,-- 2 USRP2s, 1 MIMO cable, the
    “external RF sections” said above, – Is that enough?

Correct.

You may also find these notes helpful:
http://files.ettus.com/uhd_docs/manual/html/sync.html

-josh

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