Re: [Discuss-gnuradio] change bitrate dynamically in tunnel.py

[Kouta NISHIDA]

Tom Rondeau wrote:
> On Mon, Jan 9, 2012 at 2:24 AM, Kouta NISHIDA 
> <address@hidden 
> <mailto:address@hidden>> wrote:
>
>     Hi all,
>
>     Now I use tunnel.py with USRP2.
>
>     I set bitrate when I run tunnel.py.
>     I cannot change the bitrate until I finish tunnel.py.
>     But, I want to change bitrate dynamically when I am running tunnel.py.
>
>     Does anyone know the ways to change bitrate dynamically?
>
>
>     regards,
>     kouta
>
>
> Hi Kouta,
> It's not set up to work that way right now, but you should be able to 
> hack it to do what you want.
>
> There are a couple of settings that affect the bitrate: the rate of 
> the USRP and the number of samples per symbol (sps). In the current 
> implementations of the PSK modulations, you can set a real number for 
> the sps, so you should be able to change that to affect the bit rate. 
> But remember, look for any place that is used since you'll have to 
> also reset the taps for the filters on both the RX and TX sides.
>
> You can also set the sample rate of the USRP as well to affect this.
>
> Let us know how you do with this.
>
> Tom

Thank you for your advice.

I will try setting the sample rate of the USRP to change bitrate 
dynamically.

I found the parameter that Actual Bitrate with pick_bitrate.py
Is the sample rate of the USRP Actual Bitrate ?

Would you tell me it if there are the file and parameter that I should 
pay attention to ?

regards,
kouta