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Re: [Discuss-gnuradio] Introducing noise/ considerable BER

From: Daniel Zeleznikar
Subject: Re: [Discuss-gnuradio] Introducing noise/ considerable BER
Date: Sun, 7 Aug 2011 14:47:10 -0400

As Marcus pointed out, there will always be packet loss associated with higher BER in real systems that employ packet switching. The only thing I could suggest is that you somehow move further upstream in your receive system to make the BER measurement happen at the bit/symbol level if you really want it to be accurate. Otherwise you can just collect data for both packet loss rate, and the BER of obtained packets, since that is the best thing you have to work with. The packet loss statistic may be important anyhow.

Suggestions from anyone for moving the BER measurement closer to symbol level?

On Sat, Aug 6, 2011 at 6:54 PM, Marcus D. Leech <address@hidden> wrote:
On 08/06/2011 06:27 PM, shantharam balasubramanian wrote:
I have been working in usrp2 testbed, and I have been modifying the benchmark_tx and rx programs for my project. There have been situations where I was supposed to introduce noise to find out BER. I did that by giving lower  transmitter amplitude values. But very low values cause packet loss along with higher BER values. I just want to know if there Is there anyway to just cause high BER values, without causing packet loss? Is there any way I can do that inside the program or should I do it by any other way e.g.by using some noise producing source?

Well, in real-world radio communications systems, low-SNR *does* cause packet loss.  That's entirely expected.  Nature doesn't discriminate
  between packet-synchronization data, and the actual payload data.

Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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