Li-Fi vs. Ultra-Wideband (UWB)
Comparing 2 standards across 15 specifications. 15 key differences identified.
Light Fidelity (Li-Fi, standardized under IEEE 802.11bb in 2023) is a high-speed, bidirectional, fully networked optical wireless communication (OWC) technology. Utilizing invisible infrared (800–1000 nm) or visible LED light emitters, it transmits data at multi-gigabit speeds with zero radio frequency (RF) emissions, immune to electromagnetic interference.
Ultra-Wideband (UWB) is a short-range radio communication technology standardized under IEEE 802.15.4z and governed by the FiRa Consortium and Car Connectivity Consortium (CCC). Operating across 3.1 GHz to 10.6 GHz with channel bandwidths of ≥ 500 MHz, it utilizes picosecond-duration pulses to measure Time-of-Flight (ToF) and Angle-of-Arrival (AoA), delivering centimeter-level spatial tracking and relay-attack immune digital car keys.
Specification Comparison Table
15 Parameters| Parameter / Spec | ||
|---|---|---|
|
IEEE Standard
|
IEEE 802.11bb-2023 | — |
|
Optical Wavelengths
|
800 to 1000 nm (Near-Infrared) and 380 to 780 nm (Visible Light Spectrum) | — |
|
Peak PHY Data Rates
|
Commercial systems have demonstrated over 1 Gbps; lab demonstrations have reached far higher (a 2021 IEEE study cited up to 224 Gbps), though the 802.11bb standard itself does not fix a single peak rate | — |
|
Modulation Schemes
|
OFDM (Orthogonal Frequency-Division Multiplexing) with QAM/DCO-OFDM | — |
|
Electromagnetic Interference (EMI)
|
Zero (100% RF-free) | — |
|
Security Boundary
|
Physical room containment (Light cannot penetrate opaque walls) | — |
|
Primary Applications
|
Hospital surgical suites, defense/government SCIFs, commercial aviation cabin networking, industrial automation | — |
|
Standardization Bodies
|
— | IEEE 802.15.4z / FiRa Consortium / Car Connectivity Consortium (CCC) |
|
Operating Frequency Band
|
— | 3.1 GHz to 10.6 GHz (Channel 5 @ 6.489 GHz and Channel 9 @ 7.987 GHz global) |
|
Minimum Channel Bandwidth
|
— | 499.2 MHz (500 MHz nominal) |
|
Pulse Duration
|
— | ~2 ns (nanosecond RF impulse pulses) |
|
Spatial Positioning Accuracy
|
— | 1 to 5 cm (centimeter accuracy) |
|
Distance Calculation Method
|
— | Two-Way Ranging (TWR) / Time Difference of Arrival (TDoA) |
|
Directional Angle Measurement
|
— | Angle of Arrival (AoA) via dual-antenna phase interferometry |
|
Security Physical Layer
|
— | Scrambled Timestamp Sequence (STS) to defeat relay attacks |