Polarized APSK modulation system with polymorphic SC signals

Abstract

This paper discusses a new symbol modulation scheme known as polarized amplitude and phase shift keying, ($Pol$-APSK) modulation with four rings in its basic form. The new scheme maps power-polarized symbol pairs on its constellation in order to increase the number of data symbols. $Pol$-APSK exploits a symbol mapper based on a conjugate power splitting algorithm. Product modulation is applied, where a voltage signal of a specified amplitude and phase is multiplied by another current signal of a specified amplitude and phase, thus forming polymorphic signals in the product constellation. At the receiver, an isolated detection is performed, where the voltage signal is detected independently of the received current signal. A selection combining scheme is then used. The results depict unity peak-to-average power ratio and low average symbol energy, which is desirable for Green communications in 5G networks. It presents lower bit error rates when compared with the state-of-the art $M$-ary quadrature amplitude modulation, with a signal-to-noise ratio gap of at least $10\left[\text{dB}\right]$. The proposed analytical framework closely matches the simulations for bit error rates under $M=16,32,64Pol\text{-APSK}$.