Re: [Discuss-gnuradio] sampling rate of tx_sampless.cc and rx_streaming_sampless.cc

[Krishna S]

Hi,
     So,  if i am setting interpolation rate 16 at transmitter side(tx_samples.cc), according to the equation the program is sampling at

   Sampling rate = 400/16 = 25M samples/sec.

but, I am able to receive the data only at the same decimation rate 16(rx_streaming_samples.cc) , for which the program is sampling at

Sampling rate =100/16 =6.25M samples/sec 
 
But for me to transmit and receive data i have to send and receive at 25M samples /sec right ??

if i try to do that i.e., at receiver side samp rate = 100/4 = 25M samples /sec

I don't receive at all ...?

everything boils down to one question ?

the sampling rate what we are talking here is the sampling rate at which the samples have been sampled before sending to RF as discussed in COMMUNICATION THEORY (following the Nyquist Criteria)

or the sampling rate calculated to find the allowed no.of samples/sec the ETHERNET  can take  to connect the host to USRP2.  but inside the sampling rate is different ?

As i am dealing with RF communication i need to know exactly what sampling rate the USRP2 is sampling the data and sending over the air ?

Thanks
KRISHNA S

--- On Wed, 7/4/10, Per Zetterberg <address@hidden> wrote:

From: Per Zetterberg <address@hidden>
Subject: Re: [Discuss-gnuradio] sampling rate of tx_sampless.cc and rx_streaming_sampless.cc
To: "Krishna S" <address@hidden>
Cc: "gnu" <address@hidden>
Date: Wednesday, 7 April, 2010, 7:52 AM

Krishna S wrote:
> Hi,
>     i am trying to calculate at what sampling rate does the tx_sampless.cc and rx_streaming samples.cc  are sending the data (file). from 1 USRP2 to another USRP2.
>
> i am setting interpolation as 16 at transmitter side (tx_samples.cc) and decimation rate of 16 at receiver side (rx_streaming_samples.cc)
>
> according to formula what i have learnt from WEB is
>
>
> Tx Side :  Sampling Rate =  DAC rate/ Interpolation rate;
> Rx Side : Sampling Rate =  ADC rate/ Decimation rate;
>
> are the above equation are correct for determining the sampling rate ????
>
> Thank You
> Regards
> KRISHNA S
>
>
>
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Yes, it is the sample-rate on the host-side. DAC rate and ADC rate is 100MHz.

BR/
Per

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