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Re: [Discuss-gnuradio] Rx overflow problem related with sample rate

From: tom x
Subject: Re: [Discuss-gnuradio] Rx overflow problem related with sample rate
Date: Sun, 27 Mar 2016 16:20:30 +0200


These two threads discuss a similar problem, and the conclusion in both seems to be the host PC can not process the incoming samples fast enough.

I had the same problem, but adding a power squelch block, with a threshold just above my noise floor, fixed it.

On Sun, Mar 27, 2016 at 1:39 PM, SangHyoeg Kim <address@hidden> wrote:
Hi tom,

I got overflow when sample rate is over about 5M

As your recommend, my problem is threshold of Rx? 
(Rx grep all noise signal?)

2016. 3. 27. 오후 6:53 tom x <address@hidden> 작성:


>I think my PC can handle this sample rate
Have you tried other rates? What's the highest sample rate before overflow occurs?

>How can I handle this problem ?
Maybe a power squelch block? You can filter out signals that don't meet a db threshold before they reach your PC.

On Sun, Mar 27, 2016 at 10:56 AM, SangHyuk Kim <address@hidden> wrote:

I'm using USRP N210 with CBX daughter board on native Ubuntu 14.04

When I open fft_uhd with sample rate about 25 MSps, it spits out of "D"(overfow)

As I know, USRP N210 support sample rate up to 25 MSps and it's possible on Tx mode.

I think my PC can handle this sample rate, but I don't know why this is happened.

How can I handle this problem ? 


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