RT Journal Article
T1 Spectral Shaping Method for OFDM Combining Time-Shifted Active Interference Cancellation and Adaptive Symbol Transition
A1 Giménez, Javier
A1 Cortés-Arrabal, José Antonio
A1 Martos-Naya, Eduardo
A1 Díez-del-Río, Luis
K1 Optimización matemática
K1 Multiplexación
K1 Telecomunicaciones
AB Out-of-band emission (OOBE) is a major concern in orthogonal frequency divisionmultiplexing (OFDM) based systems, as it requires large guard bands to avoid interfering other channelsor systems. Spectral shaping techniques combining active interference cancellation (AIC) and adaptivesymbol transition (AST) strategies, herein shortened as C-AIC-AST, are effective to reduce it at thecost of a data rate penalty and a modest implementation complexity compared to precoding and filteringtechniques. This paper presents a spectral shaping method that innovates previous C-AIC-AST proposalsby expanding both the AIC and AST terms to preceding and subsequent OFDM symbols. The timeexpandedterms are orthogonal to the current symbol, which makes them transparent to the receiver. Theadditional degrees of freedom given by these supplementary OOBE reduction terms can be exploited indifferent ways. In pulse-shaped OFDM systems, it allows attaining the same OOBE level than existingC-AIC-AST techniques but avoiding the data rate loss of the latter. In systems with rectangular OFDMsignals, it can notably reduce the OOBE with a much smaller reduction in the effective cyclic prefixlength compared to currently employed methods. The efficiency of the proposed method in achievingboth goals with reduced implementation cost is demonstrated through results obtained in actual wiredand wireless systems.
PB IEEE
YR 2025
FD 2025-05-19
LK https://hdl.handle.net/10630/40573
UL https://hdl.handle.net/10630/40573
LA eng
NO J. Giménez, J. A. Cortés, E. Martos-Naya and L. Díez, "Spectral Shaping Method for OFDM Combining Time-Shifted Active Interference Cancellation and Adaptive Symbol Transition," in IEEE Open Journal of the Communications Society, vol. 6, pp. 4476-4490, 2025.
NO Gobierno de España PID2019-109842RB-I00/AEI/10.13039/501100011033
NO Junta de Andalucía Project P18-TP-3587
NO Universidad de Málaga UMA20-FEDERJA-002
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026