Briefly explain the evolution of the wireless LAN protocols.?

What will be an ideal response?

?Since the introduction of IEEE 802.11, other IEEE wireless LAN protocols have emerged. IEEE 802.11b, which was ratified in September 1999, can transmit data at a theoretical rate of 11 Mbps (due to noise, the actual rate is roughly one-half the theoretical) using 2.4-GHz signals. Many users who had found 802.11's data rate of 2 Mbps too slow were excited to see 802.11b products hit the market. Another name for 802.11b (as well as the other 802.11 wireless LAN standards) is Wi-Fi (wireless fidelity). IEEE 802.11g, introduced in 2002, transmits data at a theoretical rate of 54 Mbps using the same 2.4-GHz frequencies used in 802.11b. Also introduced in 2002 was IEEE 802.11a, which is capable of supporting a theoretical rate of 54-Mbps transmissions using the 5-GHz frequency range. As if all the IEEE protocols were not enough to remember, yet one more protocol for wireless LANs is worth mentioning. HiperLAN/2, a European standard, is also capable of transmitting data at a
theoretical 54 Mbps using the 5-GHz frequency range.
The newer wireless protocols do come with some disadvantages. The high 5-GHz frequency ranges used in IEEE 802.11a and HiperLAN/2 require so much power that laptops and portables have trouble delivering these signals for a useful amount of time. Second, the transmission distance for the higher frequency ranges is shorter than for the lower frequency ranges.