File:Null-Data-Packet-The-four-step-802-11-sounding-loop-NDPA-90f90f1e.jpg

The four-step 802.11 sounding loop: NDPA announcement, NDP transmission, beamforming feedback, and steered data delivery.

AI-generated illustration for Null Data Packet, made with fal.ai (fal-ai/flux-2-pro).

Prompt: A sequence diagram showing a wireless router on the left and a laptop client device on the right, with four labelled arrow steps between them: the NDPA management frame travelling from router to client, the NDP sounding frame travelling from router to client, the BFI compressed feedback matrix returning from client to router, and finally a shaped beamformed transmission directed precisely toward the client. The arrows form a clean circular loop illustrating the continuous sounding exchange. Style: Detailed digital illustration blending technical schematic linework with painterly atmospheric rendering, as if a scientific textbook were reimagined by a noir graphic novelist. Colour palette of deep midnight blue, charcoal black, and slate grey as foundations, accented with electric teal, bioluminescent green, and cold amber. Lighting is dramatic and directional, suggesting surveillance or laboratory environments — pools of cold light against deep shadow, with occasional glowing circuit-trace highlights. Compositions favour tight framing with layered depth: foreground technical detail dissolving into abstracted background geometry. Detail level is high but purposeful, prioritising legible structure over decorative complexity. Mood is clinical yet ominous, precise yet unsettling. No text, lettering, captions, logos, watermarks or borders unless it is a technical drawing.