Why there are only 13 channels in WLAN802.11b(WiFi)?

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vivek1214

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Why there are only 13 channels in WLAN802.11b(WiFi) although frequency range is 2.40-2.4835GHz, Bw is 22MHz with 5GHz spacing?
if the space is 5MHz and BW is 22Mhz then thre will be overlaping of channels?
 

Re: about 802.11b WLAN

Hi , yes tehre is overlapping but , practically in a network we use only the channels that are sufficiently spaced to avoid overlapping.

so only few channels ( about three but I am not sure) could be used simultaneusly in a Wlan.
 

about 802.11b WLAN

See:

http://www.wi-fiplanet.com/tutorials/article.php/972261

http://en.wikipedia.org/wiki/List_of_WLAN_channels

http://www.3com.com/other/pdfs/infra/corpinfo/en_US/50307201.pdf

http://www.extremetech.com/article2/0,1558,1152281,00.asp

The Cirond paper mentioned in the last link deals with some
overlapping using 4 channels instead of 3 channels (non-
overlapping). Very interesting since use a spreadsheet
for the calculation of interference due to overlapping
channels....Google it if interested.
 

    vivek1214

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Re: about 802.11b WLAN

thanks for reply
but in a only 5MHz spacing, how they accomodate 22 MHz BW channels?
 

Re: about 802.11b WLAN

I think you will see how here:
**broken link removed**
**broken link removed**


Also for more information:

https://www.cisco.com/en/US/docs/wi...ag/admin/1.0/administration/guide/auappb.html


As an example, for channels 1 and 2(see fig.) the separation
between the center frequencies are 2417-2412 = 5 MHz. Your
confusion is "How would be a separation less than the channel
bandwidth?", right.? The figure answer that.

In reality for the 2.4GHz ISM band the whole banwidth ~ 82 MHz
only accomodate three channels NON-OVERLAPPING of 22 MHz.
 

    vivek1214

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