 |
 |
 |
 |
|
 |
|
 |
|
 |
|
 |
|
|
|
|
|
|
|
|
|
|
|
|
Philip, Here is some additional information from our team in Japan. > IEEE802.15.4 > Center freq.: 2.405GHz (11 ch) > less interference because 802.11 does not use same center frequent band > (2.412GHz (1ch)) Center freq. of 1ch(IEEE802.11b/g) is 2.412GHz and bandwidth of the signal about 22MHz like the attached file. http://en.wikipedia.org/wiki/IEEE_802.11 Then, 2.400GHz-2.424GHz is used for the WiFi 1ch. Therefore, the WiFi(1ch) causes interference on IEEE802.15.4(11cn) in a strict sense. > less interference because 802.11 does not use same center frequent band I should have said "a little interference from the IEEE 802.11(1ch)". Regards, Sung Sung Lee wrote:
Philip,What 802.15.4 channel did you use, and what 802.11 channels did the APs use?Here is the information you asked. IEEE802.11b Center freq.: 2.484GHz (14 ch, Japanese use only) there are few coexistence systems. IEEE802.15.4 Center freq.: 2.405GHz (11 ch) less interference because 802.11 does not use same center frequent band (2.412GHz (1ch)) Please let us know if you have any questions. Best regards, Sung Philip Levis wrote:On Sep 23, 2009, at 3:28 AM, Sung Lee wrote:Mischa, Thomas, and ROLL WG members, We have *very preliminary* results from DADR implementation over 802.15.4, indoor experiments. Please note that these are preliminary results and we are continuing with our experiments. More complete results for indoor and outdoor will be shared before the interim meeting. Some facts: * This summarizes the indoor, multi-floor office building experiment. * Dimension of the building is roughly 30m x 20m, 2 floors involved * There were several active WLAN APs (interference from 802.11 present).Sung, What 802.15.4 channel did you use, and what 802.11 channels did the APs use? Phil
