Sam Leffler de5af70460 Maintain a history of data associated with received frames and use this to
calculate smoothed signal quality data for each node.

o add a 16-deep history buffer to each driver-private node storage that
  holds rssi and antenna info for received frames
o override the default per-node "get rssi" method to return an average
  rssi value based on samples collected over the last second
o enable beacon reception so even idle systems maintain a running history
  of signal quality

This data may also be useful for improving the rate control algorithm.
Based on work by Tom Marshall <tommy@home.tig-grr.com> for MADWIFI.
2003-09-15 22:34:46 +00:00
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