Some Studies on Different Power Allocation Schemes of Superposition Modulation

Abstract

Abstract—Superposition Modulation/Mapping (SM) is a newly evolving modulation technique in which the conversion from binary digits to symbols is done by linear superposition of the binary digits instead of bijective (one-to-one) mapping. Due to linear superposition, the symbol distribution of the data symbols thus formed are Gaussian shaped which is capacity achieving without active signal shaping. In this paper, a detailed study on SM has been presented with respect to its different power allocation schemes namely Equal Power Allocation (EPA), Unequal Power Allocation (UPA) and Grouped Power Allocation (GPA). Also, it has been shown that SM is more capacity achieving than the conventional modulation technique such as Quadrature Amplitude Modulation (QAM)