Re: [Discuss-gnuradio] phase coherence for N210 and SBX

[Pengyu Zhang]

I followed the suggestions and plotted the received baseband signal in the IQ constellation. The phase offset of the baseband received by the two RX antennas are still not constant... Attached are the update flow graph and python program. Would be great if you can take a look again. Thanks.

On Thu, Apr 23, 2015 at 3:06 PM, <address@hidden> wrote:

If you have the Octoclock-G connected to both units, then you don't need to use the MIMO cable.

Make sure that both mboards have "external" for both the reference clock and pps selections, and that "device time" is set to "unknown PPS" for both of them.

 

 

On 2015-04-23 14:49, Pengyu Zhang wrote:

Hi,

 

I am working on phase coherent reception using 2 USRP N210s where each is mounted with a SBX. The 2 N210s are connected via a MIMO cable. 10MHz reference clock and PPS are generated by an OctoClock-G and are fed into each N210. In this experiment, a TX antenna transmits a constant signal to 2 RX antennas. I want to obtain coherent phases at the 2 RX antennas. Attached is the flow graph I am executing. It seems that I cannot achieve coherent phase at the 2 Rx antennas. Any suggestions? Thanks.

 

Pengyu

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mimo_signal.grc
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top_block.py
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