Networking 102: Introduction to Wireless Communications

Vocabulary practice flashcards covering wireless fundamentals, channel models, Wi-Fi standards, and network architectures from Networking 102.

Wireless Communication

The transmission of data over a distance without physical connections, utilizing electromagnetic waves.

Guglielmo Marconi

The inventor who pioneered wireless telegraphy in $1895$.

Free-Space Path Loss

A propagation mechanism where signal strength naturally attenuates and decreases as distance from the transmitter increases.

Multipath Propagation

A propagation phenomenon where transmitted signals reach the receiver along multiple distinct paths, resulting in constructive and destructive interference.

Fading

Fluctuations in received signal strength caused by multipath propagation and environmental conditions.

Rayleigh Fading

A statistical channel model applied to fading environments that have no dominant line-of-sight component between sender and receiver.

Rician Fading

A statistical channel model used for fading environments characterized by a dominant, direct line-of-sight signal component.

Log-Normal Shadowing

A channel model describing large-scale attenuation and variations in average received signal power caused by obstacles in the propagation path.

Mobility

The wireless advantage enabling users and devices to change locations freely without losing active network connectivity.

Scalability

The capability of a wireless network infrastructure to expand easily to support additional devices and coverage areas.

Accessibility

The capability of wireless technology to deliver internet and communication services to remote or underserved geographic regions.

Wi-Fi (Wireless Fidelity)

A technology standard designed for wireless local area networking (WLAN) to connect devices such as laptops, smartphones, and routers.

802.11a

A legacy Wi-Fi standard operating in the $5\,\text{GHz}$ frequency band with maximum speeds of $54\,\text{Mbps}$ and an indoor range of $\sim 115\,\text{feet}$.

802.11b

A Wi-Fi standard operating in the $2.4\,\text{GHz}$ band with a maximum speed of $11\,\text{Mbps}$ and an indoor range of $\sim 150\,\text{feet}$, notable for wide range but vulnerability to interference.

802.11g

A Wi-Fi standard operating on $2.4\,\text{GHz}$ with a maximum speed of $54\,\text{Mbps}$ and an indoor range of $\sim 150\,\text{feet}$, combining 802.11a throughput with 802.11b reach.

802.11n

A dual-band Wi-Fi standard operating at $2.4\,\text{GHz}$ and $5\,\text{GHz}$ delivering speeds up to $600\,\text{Mbps}$ with an indoor range of $\sim 230\,\text{feet}$, which introduced Multiple Input, Multiple Output (MIMO).

802.11ac

A Wi-Fi standard operating exclusively in the $5\,\text{GHz}$ band with maximum data rates up to $6.9\,\text{Gbps}$ and an indoor range of $\sim 115\,\text{feet}$, featuring beamforming technology.

802.11ax (Wi-Fi 6)

A high-efficiency Wi-Fi standard operating on $2.4\,\text{GHz}$ and $5\,\text{GHz}$ bands, offering maximum speeds up to $9.6\,\text{Gbps}$, higher device capacity, and optimal performance in dense environments.

Wi-Fi 6E

An extended Wi-Fi standard operating across $2.4\,\text{GHz}$, $5\,\text{GHz}$, and $6\,\text{GHz}$ bands with speeds up to $9.6\,\text{Gbps}$, using the $6\,\text{GHz}$ spectrum to reduce congestion and interference.

Bluetooth

A short-range wireless standard used to interconnect personal devices; its 5.3 specification enhances power efficiency and connection stability.

Cellular Networks

Long-range wireless communication systems based on a hierarchical layout divided into geographic cells served by base stations.

5G

A mobile network generation engineered to deliver maximum data speeds up to $10\,\text{Gbps}$, ultra-low latency, and massive machine-type connectivity.

Vehicle-to-Everything (V2X)

A vehicular communication technology that enables vehicles to exchange data directly with other vehicles and surrounding road infrastructure.

Infrastructure Wireless LAN

A centralized wireless network architecture where client devices connect to a distribution system or wired network via access points (APs).

Ad Hoc Wireless Network

A decentralized peer-to-peer wireless architecture where devices communicate directly with each other without the use of an access point.

Mesh Network

A decentralized network topology where interconnected nodes establish dynamic, self-healing links without depending on a single centralized hub.

Point-to-Point Wireless

A dedicated, directional wireless link established between exactly two nodes or devices, typically used for long-distance telecommunications backhaul.

Point-to-Multipoint Wireless

A communication architecture where a central base station antenna broadcasts to and receives data from multiple distributed subscriber stations.

Wireless Personal Area Network (WPAN)

A localized short-range wireless network optimized for interconnecting wearable or handheld devices around an individual's workspace.

Wireless Sensor Network (WSN)

A network of spatially distributed, autonomous wireless sensor nodes used for monitoring physical, industrial, or environmental conditions.

Satellite Networks

Wireless communication systems that use orbital satellites to provide global tracking, broadcasting, and broadband internet coverage.

WiMAX (Worldwide Interoperability for Microwave Access)

A wireless broadband standard developed to transmit high-speed data services across long distances for metropolitan and rural coverage.