Welcome to Agile Solutions.
Yes, it uses both common
clock and common LO. Theres no phase tracking required due to common LO
with cycle slip. This is main requirement for MIMO systems for Space
Time(STBC) and Space Frequency(SFBC) Codes.
Although, diversity only
systems needs only common clock. Either TX or RX. There were fundamental
issues when we used USRP1 to detect this problem. We had extensive
analysis and solid theoretical analysis to prove this. Although this
analysis and material is not property of Agile Solutions, we would not
like to comment more on this.
In principle, MIMO systems need strict
phase relations between antenna’s to work.
Particularly antenna phase
relations are closely related to antenna correlation parameters.
primary goal is to help people adopt low cost SDR solution(like USRP)
which empowers our world for better wireless solution. Our effort is to
make improvement every day and contribute more as far possible.
know your question was straight to know in particular to LO. We intended
to add more information so that people visiting at GNURADIO may benefit
with this information.
On Sat, 16 Apr
2011 13:06:06 -0400, “Marcus D. Leech” wrote: On 04/16/2011 05:10 AM,
[email protected]  wrote:
AGILE SOLUTIONS IS PLEASED TO
ANNOUNCE USRP STAR. YET ANOTHER ADDITION TO GNURADIO
USRP STAR is a
2x2 full duplex MIMO Transceiver System housing complete RF and DAQ
subsystems on a single board. Its architecture is designed for a true
MIMO System. It meets the unique architecture required for MIMO systems
which are not part of traditional MIMO hardware’s using common clock for
RF subsystems where a continuous RF phase tracking is required. Coupled
with these benefits it hosts onboard RF Transceiver subsystems capable
of tuning frequencies from 400MHz to 4.4GHz. Applications developed
based on USRP1 seamlessly works with USRP STAR.
USRP STAR is under
production. Pre-Reservations are open.
USRP STAR is available for Low
Introductory price of USD 800.
USRP STAR HOSTS
- Altera Cyclone
- Cypress FX2 USB
- Quad 12-Bit 64 MSPS ADC
14-bit 128 MSPS DAC
- 50MHz Lowpass filters for each channel at
- Dual 400MHz to 4.4GHz Quadrature Modulators with fine
tuning resolution of 1Hz
- Dual 400MHz to 4.4GHz Quadrature
De-Modulators with fine tuning resolution of 1Hz
- LNA’s, Power
amplifiers and attenuaors
- Receiver Sensitivity: -115dBm upto 3.8GHz
and -95dBm upto 4.4GHz
- MAX RF Output Power: 17dBm with upto 25dB
Output power control
- Receiver Sensitivity: -115dBm upto 3.8GHz and
-95dBm upto 4.4GHz
- Receiver Noise figure: 6-8 dB
For more details
and enquiries please visit www.agile-sdr-solutions.com .
Agile Solutions _______________________________________________
Discuss-gnuradio mailing list [email protected] 
http://lists.gnu.org/mailman/listinfo/discuss-gnuradio  Does this
have independent LOs, or does it use a common LO for both channels?
Shirleys Bay Radio Astronomy