Mike Varner recently returned from Kalamata, Greece, where he presented original research on the use of perfect pulses for scattering low-powered digital signals onto existing radio transmissions (often referred to as ambient communications or ambient scatter in the research literature; we like the term ReMoRa — Reflection of Modulated Radio — since it conjures up the analogous image of a “suckerfish” signal). Perfect pulses are signal components with remarkable DC-nulling properties; from these primitive signal constructs, a radio can construct informative digital signals that enable a number of applications, from clandestine signal transmission to low-power/batteryless sensors that “piggy-back” their information onto FM, TV, or cellular transmissions. Download his poster presentation here.