802.11b Standard On 2.4 GHz

Check here the description of 802.11b standard that works on 2.4 GHz band. This standard works on the frequency of 2.4 GHz with maximum bandwidth of 11 Mbps. Use of 2.4 GHz band which is unregulated frequency – providers do not have to pay the license for using this band.

Interference could occur, because other vendors use the same frequencies, also. Microwave ovens, cordless phones and Bluetooth devices work on the same band.

11b uses DSSS (Direct-sequence spread spectrum) and CCK (Complementary Code Keying) on the frequency 2.4 to 2.483 GHZ.

DSSS is the modulation technique in which transmitted signal takes up more bandwidth than the information signal that is being modulated. The name spread spectrum comes from the fact that the carrier signal occurs over the full spectrum of the transmitting frequency.

Its range in the indoor environment is about 35 meters (117 feet), and 100 meters (333 feet) in an outdoor environment.

From the table above, you can notice that this standard has been divided into 14 channels. Unlike for the 802.11 a standard, here we have the same maximum power for all channels of 100 mW. All the channels have the same band gap of 5MHz or 0.005 GHz, except the frequency gap between last two channels. The frequency gap between channel 13 and channel 14 is 12 MHz.

You may be interested in following pages:
- 802.11a
- 802.11g
- 802.11n
- IEEE 802.11i

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