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[Discuss-gnuradio] RE: Help req: Simulataneous transmission

From: nadia raj
Subject: [Discuss-gnuradio] RE: Help req: Simulataneous transmission
Date: Tue, 5 Jan 2010 19:28:09 +0000

Thankyou  for your help Mr.Eric.
I have been able to develop a flowgraph using your advice, however i have two q's:

1) I have used two gr.hier_block2's, one for each antenna. Now when ill create their instances one after the other, so will they execute simultaneously??

2) If i want to send data to side A of usrp and in it TX/RX side whats the proper syntax for it.
Is self.sink=usrp_sink.subdev(0,0) a correct syntax?

I have got two daughter boards on one usrp.

Thankyou in advance.


> Date: Mon, 4 Jan 2010 10:40:43 -0800
> From: address@hidden
> To: address@hidden
> CC: address@hidden
> Subject: Re: Help req: Simulataneous transmission
> On Mon, Jan 04, 2010 at 06:06:51AM +0000, nadia raj wrote:
> >
> > Hi,
> >
> > Thank you Mr.Eric for your valuable advice.
> You're welcome.
> > Yes i studied and completely understood the example that you referred.
> >
> > I have ,with your advice solved the problem of spatial demux.
> >
> > Now i want to ask you that now as i have two independent streams of
> > data, what stategy should i adopt to ensure that the two streams are
> > transmitted simultaneously via two separate daughterboards mounted
> > on onse usrp1 which is plugged into a hostpc ?
> > Shoud i make two separate threads, one for each transmitter??
> > Each thead would take the physical layer packet (one stream of data)
> > as an input, and the perform modulation + transmission of data.
> No, use a single flow graph (top_block) that contains both transmitter
> paths (probably implemented as hier_block2's). As long as both paths
> produce samples at the same rate, the process of combining them with
> the interleaver will ensure that they reach the USRP daughterboards at
> the same time.
> Eric

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