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Re: [Discuss-gnuradio] appending preamble with different power

From: Colby Boyer
Subject: Re: [Discuss-gnuradio] appending preamble with different power
Date: Thu, 23 Jun 2011 12:03:30 -0700

Or operate your receiver at absolute zero so there is no thermal noise? :D

On a more serious note, how I do preamble detection is the following:

* Figure out the sample sequence of your TX'ed preamble sequence, use this as a match filter.
* Tag the magnitude of the match filter and run through the peak detector block, which should locate the spike in energy from the preamble.
* When this happens, your packet frame begins one sample in the future (post preamble).

From me, this seems to work pretty well....all things considered.

On Thu, Jun 23, 2011 at 11:48 AM, Marcus D. Leech <address@hidden> wrote:
On 23/06/2011 2:31 PM, Nick Foster wrote:

Why would you set the amplitude of the preamble differently than the
actual data?

In the hopelessly-naive assumption that the preamble can be made to be "perfect" through brute-force transmit power.

Like you observed earlier, correlation is the correct way to detect a preamble.

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