Re: how is interpolation rate dynamically set?

Yes, the final sampling rate of DAC is 128Msps which is fixed number.
But what is the default value for interpolation rate? As we know,
bitrate=128M/interpolation rate/samples per symbol* bit per symbol,
while bit per symbol could be known from modulation scheme, how to
calculate interpolation rate once the bitrate is set? Thanks!

Bill

----- Original Message ----
From: Brian P. [email protected]
To: Bill S. [email protected]
Cc: [email protected]
Sent: Friday, September 26, 2008 6:16:42 PM
Subject: Re: [Discuss-gnuradio] how is interpolation rate dynamically
set?

On Fri, Sep 26, 2008 at 6:10 PM, Bill S.
[email protected] wrote:

Thank you, Brian!

Now i know how the interpolation changes, but if bitrate were set, how are
interp/decim rate and
samples-per-symbol derived respectively? Is there a default value for
interpolation rate? Thanks!!!

I believe the USRP operates at 128Msps for the TX DAC. This value
does not change.

Brian

On Fri, Sep 26, 2008 at 9:40 PM, Bill S.
[email protected] wrote:

bitrate=128M/interpolation rate/samples per symbol* bit per symbol

Through the powers of algebra:

A = B / C / D * E

Solve for C.

Brian