Re: [Discuss-gnuradio] Maximal signal bandwith for the usrp

[Martin Dvh]

JALLON Pierre 201932 wrote:
> Dear all,
> 
>  
> 
> According the USRP v4 description:
> 
> http://www.ettus.com/downloads/usrp_v4.pdf
> <http://www.ettus.com/downloads/usrp_v4.pdf> 
> 
> the usrp is able to process signals up to 16MHz. 
> 
>  
> 
> As the USB port is limited to 60MB/s, and if the samples are coded on 32
> bits (16 for Q and 16 for I), the maximal bandwidth equals 15MHz.
The USRP can code signals as 32 bits (16 for Q and 16 for I)
In this case the usrp is able to process signals up to 8 MHz.
The USRP can also code signals as 16 bits (8 for Q and 8 for I)
In that case the usrp is able to process signals up to 16 MHz.
> 
>  
> 
> Which version is correct?
> 
>  
> 
> Furthermore, considering that the first ADC works at 64Ms/s, the
> available rate for the USB equals:
> 
> 32/2 (is it available ?)
> 
> 32/3
> 
> 32/4
> 
> 32/5
> 
> ...
> 
> 32/256
> 
>  
> 
> Am I right ?
the first ADC works at 64Ms/s, the
available rate for the USB equals:
64/4    (64/4 is only available with halfband filter disabled)
64/8
64/12
64/16
64/20
...
64/256

The halfband filter in the usrp firmware has a minimal decimation rate of 8. 
That is why 64/4 is only available with halfband disabled.


Martin
> 
>  
> 
> Thank you for your answers,
> 
>  
> 
> Pierre Jallon
> 
> 
> 
> 
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