Experimental demonstration of forward distortion compensation based on amplitude-phase block modulation for nonlinear wireless communications
Fan M, Yi C, Wang H M, et al
Sci China Inf Sci, 2026, 69(5): 154301
High energy efficiency and broad coverage are essential requirements for 6G and beyond 6G (B6G) wireless communication systems, along with the deployment of millimeter wave (mmWave) and terahertz (THz) frequency bands. However, these evolutions have also exacerbated the nonlinear behavior of radio frequency (RF) hardware, particularly power amplifiers (PAs), which fundamentally limit system performance. When PAs operate in their linear region with large power back-off, their power-added efficiency (PAE) is extremely low at mmWave and THz bands. In contrast, operating in the nonlinear region ensures a much higher PAE but introduces significant challenges, including severe out-of-band (OOB) emissions and in-band nonlinear distortion, which degrade both spectral efficiency and information transmission reliability.