WiFi wireless technology is a wireless transmission technology of 2.4G carrier and WiFi communication protocol. WiFi wireless technology is the derivative of 2.4G technology. Like Bluetooth, it uses the frequency band near 2.4G as the communication carrier, but the communication protocols are different. WiFi is based on IEEE802.11a and IEEE802.llb. WiFi is a much faster protocol with a larger coverage. Although both use the same frequency range, WiFi requires more expensive hardware. The advantage of Wi-Fi is that the 2.4 GHz ISM band is widely used in most countries in the world, so it is the most widely used; "wireless fidelity", the maximum data transmission rate is 11 Mh / s, but also according to the signal The transmission rate is adjusted to 5.5 Mb/s, 2 Mb/s and 1 Mb/s bandwidth; the coverage distance is wide, no straight line propagation is required, the transmission range is 300 m in the outdoor, and the maximum is 100 m in the case of indoor obstacles. It can wirelessly connect terminals such as personal computers and handheld devices (such as PDAs and mobile phones).
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