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Re: [Discuss-gnuradio] USRP Tx Rate Conversion
From: |
Brian Padalino |
Subject: |
Re: [Discuss-gnuradio] USRP Tx Rate Conversion |
Date: |
Tue, 15 Apr 2008 16:03:24 -0400 |
On Tue, Apr 15, 2008 at 3:48 PM, Wireless Monster
<address@hidden> wrote:
> ...I understand...
> so... What needs to be done to assure data will be treated as a 270.833Ks/s
> rate?
I feel like we're in an Abbott and Costello routine.
Data is nothing until it's pumped out of a DAC at a specific rate.
Lets say it's 64Msps is the exact rate we're going to be feeding some
DACs. We know there is an interpolating CIC filter beforehand. We
figure we'll do a power of 2 to ensure there is no extra gain added to
the signal - so we choose 64.
Knowing this information, the stream at the output of the
interpolating CIC filter is 64Msps, and the stream going in is
64/64Msps, or 1Msps - then we know we should generate a stream of data
that is in fact a 1Msps representation of whatever data we wish.
In your case, you wish to make a 270.8333kSps (the S here means
Symbols ... also known as a baud) stream into a 1Msps sample stream.
With some quick math, I can determine that you need to interpolate by
the exact value of 48/13. This has your data (270.8333kSymbols/sec)
at a sample rate of 1Msample/sec.
The lesson here is to never mix the terminology of sample and symbol
(or baud) rate.
Is it more clear as to what you're doing now?
Brian
- [Discuss-gnuradio] USRP Tx Rate Conversion, Wireless Monster, 2008/04/14
- Re: [Discuss-gnuradio] USRP Tx Rate Conversion, Brian Padalino, 2008/04/14
- Re: [Discuss-gnuradio] USRP Tx Rate Conversion, Wireless Monster, 2008/04/15
- Re: [Discuss-gnuradio] USRP Tx Rate Conversion, Brian Padalino, 2008/04/15
- Re: [Discuss-gnuradio] USRP Tx Rate Conversion, Wireless Monster, 2008/04/15
- Re: [Discuss-gnuradio] USRP Tx Rate Conversion,
Brian Padalino <=
- Re: [Discuss-gnuradio] USRP Tx Rate Conversion, Dan Halperin, 2008/04/15
- Re: [Discuss-gnuradio] USRP Tx Rate Conversion, Wireless Monster, 2008/04/15
- Re: [Discuss-gnuradio] USRP Tx Rate Conversion, Wireless Monster, 2008/04/17
- Re: [Discuss-gnuradio] USRP Tx Rate Conversion, Brian Padalino, 2008/04/17
- Re: [Discuss-gnuradio] USRP Tx Rate Conversion, Wireless Monster, 2008/04/17
- Re: [Discuss-gnuradio] USRP Tx Rate Conversion, Eric Blossom, 2008/04/17
- Re: [Discuss-gnuradio] USRP Tx Rate Conversion, Ed Criscuolo, 2008/04/15