The Wi-Fi Revolution
Wireless networks (WLAN) have redefined daily connectivity, eliminating the physical constraint of Ethernet cables in domestic and business environments.
The IEEE 802.11 Standard
The Institute of Electrical and Electronics Engineers (IEEE) defines the physical and connection specifications for wireless networks in the 802.11 group.
Over the years, the standard has undergone an extraordinary performance and technological evolution.
The 802.11n standard (Wi-Fi 4) introduced MIMO technology to use multiple antennas and increase data throughput.
The 802.11ac standard (Wi-Fi 5) enabled high-density transmission at 5 GHz, focusing on wider communication channels.
The 802.11ax standard (Wi-Fi 6 and 6E) optimizes the management of congested environments through OFDMA modulation and the 6 GHz spectrum.
The brand-new 802.11be (Wi-Fi 7) promises extremely low latency and dizzying theoretical speeds by exploiting multi-link operation.
Radio Frequencies and Channels
Wi-Fi radio waves travel mainly on three unlicensed frequency bands.
The 2.4 GHz band offers excellent coverage and obstacle penetration, but suffers from strong congestion and limited speeds.
The 5 GHz band offers higher bandwidth and less interference, at the expense of slightly lower range.
The 6 GHz band, recently introduced, adds wide clean channels, eliminating bottlenecks in crowded public places.
Wireless Network Security
Since the radio signal is broadcast in the air, protecting wireless communications from abusive access is of fundamental importance.
The old WEP has been abandoned for a long time due to serious security vulnerabilities that are easily exploitable.
The WPA2 protocol has guaranteed an excellent level for years through the strong AES encryption algorithm.
The WPA3 standard introduces higher-level encryption algorithms, protecting users from brute-force attacks.
Conclusions
The continuous evolution of Wi-Fi ensures that our networks continue to support the growing demand for data and smart devices.