On 03/28/2016 07:10 AM, Daniel R. Marlow wrote:
Hi Fikrat,
The sampling rate must be twice the BANDWIDTH that you want. I
don't know much about
WiFi, but from the numbers you give, the range of frequencies you are
interested in seems to
span about 2.447 - 2.427 GHz = 20 MHz. The receiver users an analog
mixer to shift the frequency
band you want down to near zero frequency, so sample with 50 MHz
should be adequate.
Sincerely,
Dan Marlow
This is all complex sampling, so if your signal is 20Mhz wide, then
sample it at a little more than 20MHz. With complex (I/Q) sampling,
a signal is sampled twice during each sampling period (at 90 degree
intervals). This satisfies Nyquist.
------------------------------------------------------------------------
*From:* discuss-gnuradio-bounces+marlow=princeton....@gnu.org
[discuss-gnuradio-bounces+marlow=princeton....@gnu.org] on behalf of
Fikrat Al-Kazimi [alkazim...@gmail.com]
*Sent:* Monday, March 28, 2016 7:03 AM
*To:* discuss-gnuradio@gnu.org
*Subject:* [Discuss-gnuradio] Max Sampling Rate Limitation
Dear all,
I am trying to monitor Wi-Fi channel number 6 which ranges from
2.427GHz to 2.447GHz.
As I read though, the sampling rate must be at least double the
highest frequency, which in my case is equal to 4.894GHz. However, the
USRP has a limit of 50MHz that I cannot exceed (I tried and it kept
giving me actual sampling rate = 50MHz). Is there a way around it so
that I can reconstruct the signal without much losses? What proper
sampling rate can I choose?
Best regards,
Fikrat
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