Ultra-wideband (UWB) wireless communication systems are based on the transmission of extremely narrow pulses. with a duration inferior to a nanosecond. The application of transmit reference (TR) to UWB systems allows to side-step channel estimation at the receiver. with a tradeoff of the effective transmission bandwidth. https://www.marcelovicente.com/product-category/anti-frizz-blow-dry-balm/