Re: [Discuss-gnuradio] Trying to use the complex int16 option of the UHD blocks

Hi Josh,

I am just wondering how the USRP performs the 8 bit mapping for I & Q samples. The ADC & DAC have 12 - 14 bit precision, I think. When I select the sc8 wire format, does the USRP divide the entire received signal range into 2^8 sectors and uses one number to represent each of those?

Thanks,

Nazmul

On Sun, Jul 22, 2012 at 4:22 PM, Josh Blum <josh@ettus.com> wrote:

On 07/22/2012 01:14 PM, Nazmul Islam wrote:
> Hello,
>
>  I am trying to use the complex int16 option of the UHD (source/sink)
> blocks in my GRC generated python codes. I am doing wide band spectral
> analysis in my experiments. Therefore, 50 MS/s will be very helpful for me.
>

The host format and the wire format are totally independent options
here. Both of these properties also configurable properties in the GRC
USRP source/sink blocks.

* You need to set the wire format to sc8 (thats 2 bytes per complex
sample) to achieve 50 Msps over gigabit ethernet.

* The desired host format does not have to change. fc32 (complex floats)
is a perfectly valid setting

-josh

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--
Muhammad Nazmul Islam

Graduate Student
Electrical & Computer Engineering
Wireless Information & Networking Laboratory
Rutgers, USA.