Re: [Discuss-gnuradio] Is there a project which implements half-duplex communications?

[Marcus Müller]

Hi Jeon,

Yes, of course these things have been doable for quite some time -- not very much because the latency of the buses went down, but more because the USRPs learned to use command times, which means that you could instruct the USRP to start to receive and transmit at sample-accurate times, so to hide the latencies.

By now, there's quite some standards implemented. gr-mac, formerly pre-cog, is one of the frameworks you could build upon.
Bastian Bloessl has actually developed multiple working transceivers: Have a look at gr-iee802-11 (working WiFi implementation) an gr-iee802-15-4 (Zigbee); they do work pretty well.

Best regards,
Marcus

On 06/30/2015 03:30 PM, Jeon wrote:

Hello, GNU Radio users,

Very long time ago, USRP 1 was not suitable for half-duplex communications because USB 2.0 interface is too slow to achieve it.

But now, there are USRP embedded and gigabit ethernet supporting USRP series.

In my opinion, thus, half-duplex communications might be achievable nowadays.

I am curious that there is a project which implements half-duplex communications.

If there is, how many USRPs, daughterboards and antennas are used for each node?

Can I find such a project in pybombs?

In my guess, a half-duplex communication application can be built from both USRP sink and source being placed in one flow graph.

But I have no idea of the rest of the flow graph. Should the flow graph open loop or closed loop?

Is there a special configuration or tweak on USRP or GNU Radio required to achieve half-duplex communications?

I apologize if my question sounds quite vague.

Regards,

Jeon.

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