Polar Modulation with CR Method for Optical Wireless Communication MIMO System

Simple modulation technique named polar modulation for converting QAM symbol to real and positive symbol is well known that the does not require the complicated process like Hermitian symmetry. However, there is a problem that the Euclidean distance between polar modulated symbols is uneven in constellation, thereby increasing the error probability of a specific symbol. In this paper, we propose an efficient polar modulation scheme which uses CR to uniform the Euclidean distance between polar modulated symbol. Simulation result shows that the proposed method has better BER gain and power consumption compared with general polar modulation.