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

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] Introducing noise/ considerable BER
Date: Sat, 06 Aug 2011 18:54:39 -0400
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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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