Hi! On Wed, 14 Jan 2009, Miklos Maroti wrote:
> Channel 11 is not too bad either, no? Miklos Zigbee channel 11 is overlapping with the WiFi channel 1. That is no true for Zigbee channel 26. As you can see from figure 4 from the paper the lossrate of the 4 Zigbee channel overlapping a WiFi channel will have losses if the WiFi traffic is increased. As figure 1 indicate, Zigbee channel 24 is the last one overlapping with the WiFi channel 11. So both 25 and 26 should be the best one, with 26 being the farthest away. -- Razvan ME > On Wed, Jan 14, 2009 at 2:05 AM, Razvan Musaloiu-E. <[email protected]> > wrote: >> Hi! >> >> The attachment was a little above the limit of the mailling list. Here is a >> link to it: >> http://farm4.static.flickr.com/3416/3194852987_7252787b60_o.png >> >> Sorry for duplicates! >> Razvan ME >> >> On Tue, 13 Jan 2009, Razvan Musaloiu-E. wrote: >> >>> Hi! >>> >>> On Wed, 14 Jan 2009, Miklos Maroti wrote: >>> >>>>> Can you give a little more information about how the radio communication >>>>> was bad? Did you notice an increase of lossrate? Change in RSSI or LQI? >>>> >>>> The noise floor was much higher, CRC errors happened a lot, I even got >>>> random messages passing the CRC checks. >>>> >>> >>> I attached a boxplot graph with the RSSI and ED collected by Yin Chen in >>> our lab (we have WiFi APs on the WiFi channels 3, 8 and 11) for an Iris >>> mote. For each Zigbee channel about 2000 samples were collected. We haven't >>> test again the CC2420 but an older graph shows similar patters: top graph >>> from figure 3 from page 5 from here: >>> http://cs.jhu.edu/~razvanm/ijsnet2008interference.pdf >>> The overlapping between WiFi channels and Zigbee channels is depicted in >>> figure 1 from page 3. >>> >>> So the conclusion would be that channel 26 is indeed the farthest away >>> from the WiFi. It would be nice if we can compare with traces from other >>> places. >>> >>> -- >>> Razvan ME >> > _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
