Wireless local area networks history and

WLANs Terrestrial microwave — Terrestrial microwave communication uses Earth-based transmitters and receivers resembling satellite dishes. Terrestrial microwaves are in the low gigahertz range, which limits all communications to line-of-sight. Communications satellites — Satellites communicate via microwave radio waves, which are not deflected by the Earth's atmosphere.

Wireless local area networks history and

Types of wireless networks The preceding classification is neither complete nor entirely accurate. Many technologies and standards start within a specific use case, such as Bluetooth for PAN applications and cable replacement, and with time acquire more capabilities, reach, and throughput.

In fact, the latest drafts of Bluetooth now provide seamless interoperability with Similarly, technologies such as WiMAX have their origins as fixed-wireless solutions, but with time acquired additional mobility capabilities, making them a viable alternative to other WAN and cellular technologies.

The point of the classification is not to partition each technology into a separate bin, but to highlight the high-level differences within each use case. Some devices have access to a continuous power source; others must optimize their battery life at all costs.

Wireless LAN - Wikipedia

Some applications require always-on connectivity, while others are delay and latency tolerant. These and a large number of other criteria are what determine the original characteristics of each type of network. However, once in place, each standard continues to evolve: It is not a question of picking, or betting on, just one wireless standard!

Wireless local area networks history and

However, regardless of the specific wireless technology in use, all communication methods have a maximum channel capacity, which is determined by the same underlying principles. In fact, Claude E. Shannon gave us an exact mathematical model Channel capacity is the maximum information rate to determine channel capacity, regardless of the technology in use.

Channel capacity is the maximum information rate C is the channel capacity and is measured in bits per second.

BW is the available bandwidth, and is measured in hertz. S is signal and N is noise, and they are measured in watts. Although somewhat simplified, the previous formula captures all the essential insights we need to understand the performance of most wireless networks.

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Regardless of the name, acronym, or the revision number of the specification, the two fundamental constraints on achievable data rates are the amount of available bandwidth and the signal power between the receiver and the sender. Both the sender and receiver must agree up-front on the specific frequency range over which the communication will occur; a well-defined range allows seamless interoperability between devices.

For example, the Who determines the frequency range and its allocation? In fact, due to different government regulations, some wireless technologies may work in one part of the world, but not in others.

Different countries may, and often do, assign different spectrum ranges to the same wireless technology.

Wireless local area networks history and

Politics aside, besides having a common band for interoperability, the most important performance factor is the size of the assigned frequency range.Introduction to Wireless Networks.

Performance of Wireless Networks, Chapter 5 §Ubiquitous Connectivity One of the most transformative technology trends of the past decade is the availability and growing expectation of ubiquitous connectivity.

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From the Birth of Telecommunications to the Modern Era of Cellular Communications and Wireless Local Area Networks: a brief summary of the evolution of wireless communications from telegraph to radio, cellular communication, wireless local area networks, and beyond.

A wireless LAN (WLAN) is a wireless computer network that links two or more devices using wireless communication to form a local area network (LAN) within a limited area such as a home, school, computer laboratory, campus, office building etc.

This gives users the ability to move around within the area and yet still be connected to the . A wireless network is a computer network that uses wireless data connections between network nodes.. Wireless networking is a method by which homes, telecommunications networks and business installations avoid the costly process of introducing cables into a building, or as a connection between various equipment locations.

Wireless telecommunications networks . This is an “official” Clear Networks thread to encourage all Clear customers, prospective customers and any other interested folks to discuss our products and services, seek answers to questions, offer constructive feedback, and so forth.

Introduction to Wireless Networks. Performance of Wireless Networks, Chapter 5 §Ubiquitous Connectivity One of the most transformative technology trends of the past decade is the availability and growing expectation of ubiquitous connectivity.

Wireless network - Wikipedia