Generalized Papoulis–Gerchberg algorithm for PA nonlinearity compensation in coded OFDM systems

• Published in: ICT express Vol. 10; no. 1; pp. 1 - 8
• Main Authors: Cho, Li, Fu, Sheng-Hsiang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.02.2024; Elsevier; 한국통신학회
• Subjects: IEEE 802.11ah; Nonlinearity compensation; OFDM; Papoulis–Gerchberg algorithm; PAPR; 전자/정보통신공학; OFDM; IEEE 802.11ah; PAPR; Papoulis–Gerchberg algorithm; Nonlinearity compensation
• ISSN: 2405-9595; 2405-9595
• DOI: 10.1016/j.icte.2023.03.002

Iterative subcarrier regularization (ISR) has been recently proposed to mitigate the nonlinear noise caused by the saturation of power amplifiers in orthogonal frequency-division multiplexing systems. The generalized Papoulis–Gerchberg algorithm (GPGA) used in ISR exploits the frequency-domain prior knowledge specified by standards and time-domain prior knowledge reserved by low nonlinearity amplitudes. It is a reconstruction-based method that may cause bit error rate (BER) degradation when coding techniques are applied. In this work, a dual-loop structure of the GPGA is presented to integrate the cancellation-based methods for maintaining the coding gain. By using a well-known cancellation-based method, iterative clipping noise cancellation (ICNC), as an example, simulations based on the IEEE 802.11ah verified that the proposed scheme effectively maintains the contribution of both the reconstruction-based and cancellation-based methods, thus significantly outperforming the ISR or ICNC in terms of coded BER.