Reflection of Modulated Radio (ReMoRa): Link Analysis of Ambient Scatter Radio Using Perfect Pulses

Abstract

This paper explores the range and signalling limitations of ambient scatter wireless communications. Using previously modulated and transmitted electromagnetic waves as a means of power and as the RF carrier for their own communications, Reflection of Modulated Radio (ReMoRa) systems require little to no power to establish a communication link. However, employing a carrier the ReMoRa users have no control over poses a set of signalling problems that must be addressed to ensure a functioning communication link. This paper seeks to outline these obstacles and the unique demands they place on ambient scatter systems. A novel waveform, the perfect pulse, is further characterized to better solidify their candidacy as a powerful tool for the ambient communications problem, paying specific attention to DC-nulling behaviors and synchronization benefits. Spectral Exceedance is proposed as a means to compare the depth and width of DC-nulling waveforms. A realistic RF link budget is proposed to model expected RF returns and range limitations of ReMoRa systems.