Ultra-wideband (UWB, Ultrawideband, Ultra-wide-band, Ultra-wide Band) - (Associated with Radio Communications, ITU-R, Orthogonal Frequency-division Multiplexing (OFDM), Multipath Fading, Intersymbol Interference, Carrier-based Systems, IEEE 802.15.4a, Signal to Noise Ratio (SNR), Channel Capacity for a Given Bandwidth.) - Bandwidth larger than 500 MHz.