wlan

Wireless

RF Power and OFDM: dB Math, EIRP, Antennas, Link Budgets and How OFDM Carries Wi-Fi

The maths and physics behind Wi-Fi signals: dB and dBm, EIRP and ERP, antenna gain, types and patterns, received signal strength, noise floor and SNR, receiver sensitivity per MCS, free space path loss and wall attenuation, link budgets in both directions, and OFDM — subcarriers, orthogonality, guard intervals, pilots and how to calculate a data rate from first principles.

Comments Off on RF Power and OFDM: dB Math, EIRP, Antennas, Link Budgets and How OFDM Carries Wi-Fi
August 12, 2025
Wireless

Wi-Fi Frequency Bands and Channels: 2.4, 5 and 6 GHz, UNII Sub-Bands, DFS and Power Rules

Wi-Fi's three frequency bands in depth: the 2.4 GHz ISM band and the 1-6-11 rule, 5 GHz UNII-1 to UNII-4 with DFS and weather-radar channels, 6 GHz UNII-5 to UNII-8 with preferred scanning channels and LPI/Standard Power/VLP power classes and AFC, channel numbering, regional differences, range versus capacity, and channel-planning guidance.

Comments Off on Wi-Fi Frequency Bands and Channels: 2.4, 5 and 6 GHz, UNII Sub-Bands, DFS and Power Rules
August 12, 2025
Wireless

WLAN Fundamentals: 802.11 Standards, Architecture and How Wi-Fi Works

The foundations of Wi-Fi: who defines it (IEEE, Wi-Fi Alliance, regulators), the 802.11 generations from 802.11b to Wi-Fi 7, the 802.11 MAC and PHY, BSS/ESS architecture, CSMA/CA and the hidden node problem, how a client joins a WLAN, bands, modulation and MCS, MIMO/MU-MIMO/OFDMA, and Wi-Fi security from WEP to WPA3.

Comments Off on WLAN Fundamentals: 802.11 Standards, Architecture and How Wi-Fi Works
August 12, 2025