A simple digital detection scheme for demodulating QPSK signals in super-regenerative receiver architecture

Abstract

A digital detection scheme for demodulating QPSK signals is proposed. The proposed scheme can be a cascaded block following a super-regenerative oscillator that regenerates an input weak RF signal maintaining sent phase information. The detection scheme enables a simple and scalable implementation using digital logic gates and eliminates the need to downconversion step with accompanying PLL and mixers circuits. The resulting receiver would achieve lower power consumption figures than classical QPSK receivers based on direct downconversion.