File:Null-Data-Packet-Announcement-Timing-sequence-of-the-NDPA-NDP-BFI-soun-c0c7ebf9.jpg

Timing sequence of the NDPA → NDP → BFI sounding dialogue, with a passive observer synchronised by the NDPA announcement.

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

Prompt: A horizontal timing diagram showing three sequential events on a shared wireless medium: first an NDPA frame transmitted from an access point, followed after a precise short inter-frame gap by an NDP frame carrying wideband pilot signals across multiple transmit antennas, then after another gap a Beamforming Feedback Information report returning from a client station. A separate passive observer receiver is depicted alongside, aligned in time to show it capturing both the NDPA and the NDP without transmitting anything, extracting channel state information independently. 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.