What is an infrastructure WLAN?

Infrastructure wireless LANs Most companies, public hotspots, and homeowners implement infrastructure WLANs. An infrastructure WLAN, as shown in Figure 3-2 , offers a means to extend a wired network. In this configuration, one or more access points interface wireless mobile devices to the distribution system.

What does WLAN mean in Wi-Fi?

wireless local area network
A wireless local area network (WLAN) is a wireless distribution method for two or more devices. WLANs use high-frequency radio waves and often include an access point to the Internet. A WLAN allows users to move around the coverage area, often a home or small office, while maintaining a network connection.

What are different WLAN modes?

There are two modes defined in IEEE 802.11 wlan standard viz. adhoc mode and infrastructure mode. This page on WLAN adhoc mode vs infrastructure mode describes difference between adhoc mode and infrastructure mode in WLAN networks.

What is the difference between infrastructure based WLAN and ad hoc network?

In infrastructure mode, all devices on a wireless network communicate with each other through an access point (wireless router). In ad hoc mode, a computer with a wireless network adapter communicates directly with a printer equipped with a wireless print server.

What is modulation in wireless networks?

It enables the sending of encoded data using radio signals. Wireless networks use modulation as a carrier signal, which means that the modulated tones carry data. A modulated waveform consists of three parts:

What is adaptive modulation?

As a radio signal loses power or encounters interference, the error rate will increase. Adaptive modulation means that the transmitter will automatically shift to a more robust, though less efficient, modulation technique in those adverse conditions.

What is Wi-Fi-radio modulation?

Wi-Fi – Radio Modulation. WiFi systems use two primary radio transmission techniques. 802.11b (<=11 Mbps) − The 802.11b radio link uses a direct sequence spread spectrum technique called complementary coded keying (CCK). The bit stream is processed with a special coding and then modulated using Quadrature Phase Shift Keying (QPSK).

What is the difference between phase modulation and frequency modulation?

Frequency Modulation. Phase and Frequency Modulation are the two other types of modulation that can be used to impose data onto a carrier frequency. Frequency modulation (FM) is used for everyday FM radio. The signals are imposed into the carrier by adjusting the frequency of the carrier.