ath9k: DFS - add pulse chirp detection for FCC

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FCC long pulse radar (type 5) requires pulses to be
checked for chirping. This patch implements chirp
detection based on the FFT data provided for long
pulses.

A chirp is detected when a set of criteria defined
by FCC pulse characteristics is met, including
* have at least 4 FFT samples
* max_bin index moves equidistantly between samples
* the gradient is within defined range

The chirp detection has been tested with reference
radar generating devices and proved to work reliably.

Signed-off-by: Zefir Kurtisi <zefir.kurtisi@neratec.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

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Zefir Kurtisi 2015-06-16 12:52:16 +02:00 • committed by Kalle Valo

parent 8f010d9ca8

commit 8fc2b61a36

1 changed files with 161 additions and 6 deletions

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drivers/net/wireless/ath/ath9k/dfs.c

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