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Re: [Discuss-gnuradio] Help : Is this right that the daughterboard passe
From: |
Marcus D. Leech |
Subject: |
Re: [Discuss-gnuradio] Help : Is this right that the daughterboard passes data to the usrp board in the I and Q format. |
Date: |
Mon, 25 Apr 2011 09:05:57 -0400 |
User-agent: |
Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.15) Gecko/20110303 Thunderbird/3.1.9 |
On 25/04/2011 8:34 AM, ton ph wrote:
Hi marcus
thanks for immediate reply and your guide was very helpful from
my side ... Now the question is ,
suppose, i have 12 bit 200 mhz adc , and i do not want to reduce my
processing bit , as per the instruction from your side it could be
hard to process in my i5 , 4Gb ddr3 configuration computer and also i
am not aware of the IF bandwidth which might require to make
the bandwidth process instantly ( simultaneously ) . Will gnuradio be
able to support the instantaneous processing of the 100Mhz bandwidth,
I have a bit doubt as i learnt that gnuradio can support 8Mhz only.
Thanks , and i highly apologize if my post is a bit out of track or
may be called a bit illogical ....
Thanks marcus.
I process 25MHz bandwidth from a USRP2 with my Radio Astronomy
applications, on a 6-core AMD Phenom II X6 running at 3.2GHz.
The "8MHz" figure you quote is likely from the original USRP--nothing to
do with Gnu Radio, per se. The USRP1 has a maximum
bandwidth of 8MHz unless you drop down to 8-bit samples.
The computational load of a signal flow-graph is proportional to
bandwidth X complexity.
If you want to process 200Msps, with full 12-bit resolution, you'll need
to find some other host interface than 1GiGe--you'd likely
need to go to a 10GiGe interface.
And while Gnu Radio "scales" arbitrarily, there are limits to the degree
to which you can optimize a flow-graph for performance.
The "Lego brick" approach to constructing processing graphs isn't
optimal if really-high performance and low-latency are
important to you. In order to process 200Msps, you'd likely need to
hand-craft your signal processing chain, and carefully
parallelize it in an optimal way. No way are you going to be able to
do this on a single-processor machine.
Further, as you point out, the post-mixer bandwidth of the USRP-family
daughtercards is limited to much less than 50MHz, in order
for there not to be an aliases when sampled at the 100Msps rate of
the ADC on the USRP.
- [Discuss-gnuradio] Help : Is this right that the daughterboard passes data to the usrp board in the I and Q format., ton ph, 2011/04/22
- Re: [Discuss-gnuradio] Help : Is this right that the daughterboard passes data to the usrp board in the I and Q format., Marcus D. Leech, 2011/04/22
- Re: [Discuss-gnuradio] Help : Is this right that the daughterboard passes data to the usrp board in the I and Q format., ton ph, 2011/04/25
- Re: [Discuss-gnuradio] Help : Is this right that the daughterboard passes data to the usrp board in the I and Q format., Marcus D. Leech, 2011/04/25
- Re: [Discuss-gnuradio] Help : Is this right that the daughterboard passes data to the usrp board in the I and Q format., ton ph, 2011/04/25
- Re: [Discuss-gnuradio] Help : Is this right that the daughterboard passes data to the usrp board in the I and Q format.,
Marcus D. Leech <=
- Re: [Discuss-gnuradio] Help : Is this right that the daughterboard passes data to the usrp board in the I and Q format., ton ph, 2011/04/25
- Re: [Discuss-gnuradio] Help : Is this right that the daughterboard passes data to the usrp board in the I and Q format., Marcus D. Leech, 2011/04/25
- Re: [Discuss-gnuradio] Help : Is this right that the daughterboard passes data to the usrp board in the I and Q format., ton ph, 2011/04/26
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- Re: [Discuss-gnuradio] Help : Is this right that the daughterboard passes data to the usrp board in the I and Q format., Marcus D. Leech, 2011/04/27
- Re: [Discuss-gnuradio] Help : Is this right that the daughterboard passes data to the usrp board in the I and Q format., ton ph, 2011/04/28
- Re: [Discuss-gnuradio] Help : Is this right that the daughterboard passes data to the usrp board in the I and Q format., Marcus D. Leech, 2011/04/28