[USRP-users] Bandwidth limitation

mleech at ripnet.com mleech at ripnet.com
Tue Sep 30 12:21:50 EDT 2014


 

You just specify a "sc8" write-format when creating the stream args in
UHD. 

The TX and RX sides are independent. 1GiGe is full-duplex. 

On 2014-09-30 12:18, FIXED-TERM Ghobrial Antoun (CR/AEH4) wrote: 

> Hello , 
> 
> Kindly help me to understand your response. 
> 
> I have here some questions 
> 
> - Is it possible to use 8 Bit samples instead of 16 , if possible , then how ? 
> 
> - Let us say that I am using one channel for Tx (one antenna from LFTX )and another for Rx (one antenna from LFRX ) , then the max sampling rate will be 25e6/2 ? .. Did I get you correctly ? 
> 
> Thanking you in advance . 
> 
> Mit freundlichen Grüßen / Best regards 
> 
> Antoun Ghobrial
> 
> FROM: mleech at ripnet.com [mailto:mleech at ripnet.com] 
> SENT: Dienstag, 30. September 2014 18:04
> TO: FIXED-TERM Ghobrial Antoun (CR/AEH4)
> CC: usrp-users at lists.ettus.com
> SUBJECT: Re: [USRP-users] Bandwidth limitation 
> 
> The per-direction bandwidth limit over 1GiGe is 25Msps, assuming 16-bit samples. If you use sc8
> samples, that goes up to 50Msps. That's an aggregate number. If you're streaming from both antenna connectors, divide-by-2. 
> 
> But that's just the physical limit of the 1GiGe interface. How much you *can actually process* is more a function of your host 
> 
> computer than the "bus" interface. 
> 
> On 2014-09-30 11:49, FIXED-TERM Ghobrial Antoun (CR/AEH4) via USRP-users wrote: 
> 
>> Hello , 
>> 
>> I am using USRP N210 with LFTX and LFRX daughter boards connected with the host computer via an Ethernet connection. 
>> 
>> According to this tutorial provided by Ettus , 
>> 
>> http://www.ettus.com/kb/detail/usrp-bandwidth [2] 
>> 
>> I can say that bandwidth is around 20 MHz and this limit is set by the Ethernet connection. 
>> 
>> Here , I have a question : 
>> 
>> For each LFTX and LFRX , there are two antenna (or two channel A & B). 
>> 
>> If I am using only one channel (A or B) from each daughterboard (One Tx channel and one Rx channel ), Does it mean that bandwidth will remain the same to be equal = 20 MHz or 20MHz/(No of channels) ?! 
>> 
>> According to that, every channel should have a bandwidth below a certain value. How can I calculate this threshold value ?! 
>> 
>> I have the same question if I am going to use both antennas from both daughter boards ?! 
>> 
>> Any Suggestion !! 
>> 
>> Mit freundlichen Grüßen / Best regards 
>> 
>> ANTOUN GHOBRIAL 
>> 
>> _______________________________________________
>> 
>> USRP-users mailing list
>> 
>> USRP-users at lists.ettus.com
>> 
>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com [1]
 

Links:
------
[1] http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
[2] http://www.ettus.com/kb/detail/usrp-bandwidth
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