Hi! I would like to make an outdoor radio link at 5GHz between my house and one of my neighbors. Because I live near an airport, I've looked for European in force regulation regarding radar detection. I've discovered that ETSI has released a new normative on Dicember 2008 (EN 301 893 v1.5). This normative requires that WLAN devices with DFS capability must detect pulse width down to 0.8us across the bands from 5250 to 5350MHz and from 5470 to 5725 MHz; moreover they must detect staggered Pulse Repetition Frequency (PRF) radars with 3 PRF value (I don't excactly know what it means).
I have two devices with Atheros 5414 radio module, so I've looked for support of radar detection (and 802.11h) in madwifi driver. I've seen that the -dfs branch supports the EN 301 893 v1.4.1 and it implements 802.11h protocol. Looking into the madwifi-dfs code I've seen that the hardware does the pulse detection and the driver detects the radar recognizing the pulse patterns (ath/if_ath_radar.c and ath/if_ath_radar.h). Because the pulse detection is done in hardware, I suppose that for detecting pulse width down to 0.8us I need radio modules with newer chipset like AR9xxx. Is it right? Can't I use my AR5414 radio modules? So, I've searched in the code of ath9k and mac80211 but I don't find any implementation of radar detection and 802.11h. Am I wrong? I've read on http://wireless.kernel.org/en/users/Drivers/ath9k that 802.11h is a feature of ath9k driver (and consecutively of mac80211, right?). I there any way to make an outdoor radio link at 5GHz compliant to the European regulation with Linux? :-) Thanks, Albert.
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