FM-UWB is a modulation scheme using double FM: low-modulation index digital FSK followed by high-modulation index analog FM to create a constant envelope UWB signal. FDMA techniques at the subcarrier level may be exploited to accommodate multiple users. The system is intended for low (10–50 kbit/s) and medium (50–250 kbit/s) bit rate, and short-range WPAN systems. The technology, developed at CSEM, is paving the way for true low-power LDR-UWB communication devices. FM-UWB is an optional mode in the IEEE802.15.6 Body Area Network (BAN) standard.
- John F.M. Gerrits, Michiel H.L. Kouwenhoven, Paul R. van der Meer, John R. Farserotu, John R. Long, “Principles and Limitations of Ultra-Wideband FM Communications Systems”, EURASIP Journal on Applied Signal Processing, Special Issue on UWB-STATE OF THE ART, Volume 2005, Number 3, 1 March 2005, pp. 382 – 396. 
- A Short Range, Low Data Rate, 7.2 -7.7 GHz FM-UWB Transceiver Prototype