Re: [Discuss-gnuradio] Dynamic Channel bandwidth allocation

[Matt Ettus]

Michael Ford wrote:

> So, I'm trying tomake a system where nodes communicate, not on set 
> channels, but on as much of the spectrum as they can use based on the 
> level of interference. For example, we know that 802.11 divides the 
> spectrum into 13 channels with the center frequencies set at 5MHz 
> apart. In my ideal situation, a network with only two nodes would be 
> able to use the entire spectrum to send data, a network with 4 nodes 
> and two transmissions would divide the spectrum in half for each 
> transmission, and so on and so forth.
>
> In order to do this, I need to be able to scan for interference at 
> specific channels/frequencies to determine whether or not they're 
> available. Before I get too deep into the project, is this even 
> possible with the USRP motherboard and the RFX2400 transceiver board? 
> I know we have the RSSI circuit onboard, but I don't know on which 
> frequencies it scans.

The RSSI on the motherboard will tell you the power within approx. +/- 
15 MHz from your carrier.  You can also get a digital RSSI which will 
tell you the power within your signal of interest.

Matt