Computing, Telecommunication and Control Информатика, телекоммуникации и управление 2687-0517 9 10.18721/JCSTCS.19309 Adaptive PAPR reduction using tone reservation and clipping in OFDM transmission over fading channels Адаптивное снижение пик-фактора колебаний с помощью резервирования тонов и клиппирования для сигналов с OFDM в каналах с частотно-селективными замираниями 0000-0001-6503-826X Chilingarov Artem chilingarov.ao@gmail.com Gelgor Alexandr Avetisyan Vaan avahan@mail.ru Russian-Armenian University 30 09 2026 19 3 108 120

The high peak-to-average power ratio (PAPR) inherent in orthogonal frequency-division multiplexing (OFDM) signals forces the high-power amplifier (HPA) to operate with substantial input back-off (IBO) value, severely degrading transmitter power efficiency. This paper investigates the joint application of adaptive tone reservation (TR) and clipping for PAPR reduction in OFDM transmission over frequency-selective fading channels. The adaptive TR scheme employs channel state information to dynamically allocate reserved tones to subcarriers that experience poor signal-to-noise ratio (SNR) and are therefore of limited utility for data transmission. Four configurations have been systematically compared: a baseline without PAPR reduction, clipping only, adaptive TR only, and the proposed joint adaptive TR and clipping scheme. Simulations for the case of a measurement-based underwater acoustic channel with a hard-limiter HPA model demonstrate that adaptive TR alone achieves a 2.8 dB SNR gain over the baseline at a target bit error rate of 10–3, without introducing in-band distortion. The joint scheme yields a total SNR gain of 4.6 dB, combining the benefits from distortionless peak suppression by TR with the aggressive clipping action. Relative to clipping-only operation, the joint scheme decreases out-of-band emission by 3.5 dB and compresses the 99.5% occupied bandwidth by 40%. These results confirm that the combination of SINR-based adaptive TR and clipping provides simultaneous improvements in power efficiency and spectral containment, making it a compelling solution for communication systems subject to both power and spectral mask constraints.

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