2023 Volume 17 Issue 2 Pages 126-135
In view of sustainable development goals (SDGs), future wireless communications should be aimed at not only high bandwidth efficiency but also high power efficiency. In general, the modulated signals with high spectral efficiency have high peak power, which leads to low power amplifier efficiency. Therefore, there is an essential trade-off between spectral efficiency and power efficiency. In this article, discusses the distribution of instantaneous power for modern high-spectral-efficiency wireless communication signals is discussed with particular emphasis on the use of high-order moments that can readily be expressed in closed-form mathematical formulas. It is demonstrated that these formulas are useful for not only analyzing the instantaneous power of various signals, but also evaluating how superposed signals with various modulation formats, as in the case with downlink non-orthogonal multiple access (NOMA), approach the Gaussian distribution.
