Re: [Discuss-gnuradio] Simultaneous wireless transmission and reception between USRP2s

[You Lizhao]

I'm also interested in this problem. 

I have tried to setup a UHD sink and a
 UHD source using one USRP2 + XCVR2450 daughterboard like tunnel.py. The flowgraph is 
like this: (1) Tx Path: self.connect(self.txpath, self.sink); (2) Rx 
Path: self.connect(self.source, self.rxpath). It works but makes my confused since XCVR2450 does not support full-duplex operation, attempting to operate in full-duplex will result in transmit-only operation. How is it possible to setup a UHD sink and source at the same time with only one USRP2 + XCVR2450? Does it mean the UHD driver can switch between tx and rx states automatically? Or does it mean the UHD + 2450 is actually in tx mode?

Any idea would be appreciated. Thanks.


Regards,
Lizhao

2011/10/14 Marcus D. Leech <address@hidden>

On 14/10/2011 10:04 AM, Tuan (Johnny) Ta wrote:

I'm also interested in this problem. Juan Ramon, did you make any progress? If you did, would you mind sharing it?

For Marcus, I have a more general question regarding the flow graph. If I have in my GRC both a UHD sink and a UHD source block, is it true that the USRP2 will stay in receive mode until there're samples on the transmit buffer? Will it then switch to transmit mode and transmit until the transmit buffer is empty and switch back to receive mode?

Thanks,
Johnny

Basically, yes.  The UHD interface will turn back to receive when the End-of-Burst is triggered.  But Josh probably has better details.
 I'm largely a receive-only guy in my own personal projects.

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