Unified demodulation of any shift keying by phase matching technique

Abstract

In this paper we present a new technique for demodulating any Shift Keying(aSK) under sampled signal xk using an Orthogonal Decomposer. In this method we generate a phase matching signal xy. Present techniques for demodulation of any Shift Keying signal either require the knowledge of the carrier frequency or need to estimate them. The proposed method aims at detecting phase rate at the boundaries of phase change using xk, with no knowledge of carrier frequency. A sampled version of aSK signal is passed through an Orthogonal Decomposer that estimates and adjusts the phase of the incoming signal and generating a new signal xk phase shifted by π/2, The signal xk is again phase shifted by π/2 resulting xy. Phase transitions are detected using signal ek = xk - xk, for demodulating the aSK signal. This method is a novel way of demodulation focusing on the phase transitions. This will set a new trend in aSK demodulation and leading to a unified technique, spanning ASK, OOKS, BFSK and BPSK with no prior knowledge about the type of modulation.