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WLAN is a form of wireless communication that uses a series of IEEE 802.11 standards. IEEE 802.11 family comprises of several standards which are IEEE 802.11a, b, g, n, and ac,etc. In 1997, IEEE released the first protocol that operated on 2.4GHz ISM band, and used for medium access method CSMA/CA. The coverage area was 20 meters for the indoor and approximate 100 meters for the outdoor usage. The data rate was only 1 to 2 Mbps. Two years later, IEEE released 802.11b that provided higher data rate (11Mbps) with higher coverage area. It covered nearly 38 meters for the indoor and about 140 meters outdoor. The channel bandwidth was 20 MHz and the method of modulation was only DSSS. In 2003, IEEE published next standard which is 802.11g. It has higher throughput compare to its previous standard 802.11b. It included Orthogonal Frequency Division Multiplexing (OFDM) as a modulation scheme.

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