Thank Kyeong Su Shin.
Is there any chance of loosing information if I convert complex data back
to 16bit as you suggested? I think it would loose information?
Regards,
Munir
On Wed, Jan 3, 2018 at 12:16 PM, Kyeong Su Shin wrote:
> Hello M.Munir,
>
> By default, USRP gives you data in 16bit integer format (x2, for I and Q).
> GNU Radio's complex data type uses IEEE754 single precision (x2, for I and
> Q). The data type is converted by UHD (the USRP driver). Each IEEE754 data
> point requires 32bit of storage (or memory, bandwidth, etc). This is why
> the data size is doubled.
>
> You can set the UHD block to output the raw int16 (interleaved) data, or
> you can convert back the GNU Radio's complex data type to a int16 based
> format and then send them over TCP (*make sure that you re-scale the I-Q
> data, as the complex data is normalized to [0,1] by UHD).
>
> Regards,
> Kyeong Su Shin
>
> On Wed, Jan 3, 2018 at 2:25 PM, Muhammad Munir
> wrote:
>
>> Dear All,
>> I am confused to understand a behavior of GNURADIO USRP Source block. The
>> problem is,
>> 1. I connected USRP N200 with my PC.
>> 2. I set both the cahnnels of USRP
>> 3. I set the sampling rate of both as 5MHz
>> 4. I connected one channel directly to the Frequency Sink Block
>> 5. I connected the 2nd channel with TCP sink to transfer data of channel
>> 2 to the other PC.
>> 6. When I started the flow graph and checked for data rate on system
>> monitor,
>> I was receiving data at 40MBps and sending data was at 80 MBps.
>> Can anyone explain this behaviour?
>> Is it the issue with Gnuradio USRP source block?
>> I read a long before that UHD block gets samples from USRP and combine
>> two samples into single for comples output. If it is, then It should not
>> affect the data rate?
>>
>> Kind Regards,
>> M. Munir
>>
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>>
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