How does beamforming in Wi-Fi 6 and 7 differ from beamforming in 5G NR?

How does beamforming in Wi-Fi 6 and 7 differ from beamforming in 5G NR? Both Wi-Fi and 5G NR use beamforming to improve signal quality and throughput, but the implementation approaches are fundamentally different due to the distinct operating environments and frequency ranges: (1) Wi-Fi beamforming (802.11ac/ax/be): type: digital beamforming (baseband precoding). The AP has 2-8 antennas with independent RF chains. The baseband processor applies complex weights to the digital signals before DAC conversion. These weights steer the beam toward the intended client. Feedback mechanism: Explicit Beamforming (EBF): the AP sends a Null Data Packet (NDP) sounding frame. The client measures the channel from each AP antenna and computes a beamforming feedback matrix (compressed CSI). The client sends this matrix back to the AP. The AP uses the matrix to compute the precoding weights. This process repeats every 100-500 ms to track channel changes. Number of beams: typically 2-4 spatial streams (limited by the number of RF chains). Frequency: 2.4/5/6 GHz (sub-7 GHz, far-field radiating region for typical array separations). (2) 5G NR beamforming: type: hybrid beamforming (analog + digital). The base station has 32-256 antenna elements (massive MIMO). Analog beamforming: uses phase shifters at each antenna element to steer the beam in a specific direction; a single RF chain feeds multiple antenna elements through the phase shifter network. Digital beamforming: applied after the analog beamforming stage, using multiple RF chains for multi-user MIMO. The combination allows both directional beam steering (analog) and spatial multiplexing (digital). Feedback mechanism: FR1 (sub-6 GHz): uses CSI-RS (Channel State Information Reference Signal) and PMI (Precoding Matrix Indicator) feedback from the UE. FR2 (mmWave): uses beam sweeping and beam management: the base station sweeps through a codebook of beam directions. The UE measures each beam and reports the best beam index (SSB index and CSI-RS beam index). The base station selects the best beam for each UE. This beam management procedure is more complex than Wi-Fi EBF because of the narrow beams and high path loss at mmWave. Number of beams: FR1: 8-64 beams simultaneously (massive MIMO can serve 8-16 users in the same time-frequency resource). FR2: 2-8 beams simultaneously (limited by the number of digital RF chains). (3) Key differences: Wi-Fi: 2-8 antennas, purely digital BF, client feedback, sub-7 GHz, omnidirectional element pattern. 5G: 32-256 antennas, hybrid analog+digital BF, beam sweeping at mmWave, sub-6 to 71 GHz, directional element pattern.