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Re: [Discuss-gnuradio] Requested decimation is odd

From: Ting Wu
Subject: Re: [Discuss-gnuradio] Requested decimation is odd
Date: Mon, 12 Nov 2012 11:42:12 +0900

Thank you for your response!


We need to use the sampling rate of 4 MHz. How can I deal with this problem?

Actually we have been running the same application on several USRPs (N200 and N210), and there was no such warning.


Any suggestions?


Ting Wu


From: Marcus D. Leech [mailto:address@hidden
Sent: Monday, November 12, 2012 11:29 AM
To: Ting Wu
Cc: address@hidden
Subject: Re: [Discuss-gnuradio] Requested decimation is odd


Hi all,


I am using USRP N200 with LFRX daughter board. The newest version of images has been loaded.

The sampling rate is set as 4 MHz. There is constantly a UHD warning:


The requested decimation is odd; the user should expect CIC rolloff.

Select an even decimation to ensure that a halfband filter is enabled.


How do I change the decimation value?

And what value should I set it?




Ting Wu

100e6 / 4e6 = 25

Which is odd value which changes the "line up" of filtering in the FPGA.

Select a sample rate that results in an even decimation value, unless you can live with the edge roll-off for an odd value.

Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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