AI 中文总结
针对低功耗物联网系统的CP问题，提出CP感知的OFDM-OOK波形设计，经分析仿真验证其可在控制干扰的同时提升OOK检测性能。
AI 中文摘要
本函件针对低功耗物联网（IoT）系统中基于正交频分复用（OFDM）的开关键控（OOK）生成存在的循环前缀（CP）问题这一挑战展开研究。我们提出一种CP感知的波形设计，该设计在整个CP-OFDM符号持续时间内生成OOK信号，若CP不匹配，信号经过信道后可能破坏子载波正交性。为实现该机制，需独立生成OOK信号并对现有基于OFDM的OOK生成模块进行修改，还可应用块级时间偏移以最小化CP失配。分析讨论与仿真结果证实，该设计对传统子载波的干扰处于可控范围，同时OOK检测性能显著提升，不过实际部署时需仔细权衡相关折中问题。
英文摘要
This letter addresses the challenge of cyclic prefix (CP) problem in orthogonal frequency division multiplexing (OFDM)-based on-off keying (OOK) generation for low-power Internet of Things (IoT) systems. We propose a CP-aware waveform design that generates the OOK signal over the entire CP-OFDM symbol duration, potentially breaking subcarrier orthogonality after passing through the channel if the CP is not matched. To enable such a mechanism, OOK has to be generated independently and a modification to the existing OFDM-based OOK generation block is needed. Additionally, a block-wise time shift can be applied to minimize CP mismatch. Analytical discussions and simulations confirm that the resulting interference on legacy subcarriers remains controlled, while OOK detection performance significantly improves, albeit with trade-offs that should be carefully considered in practical deployments.
Journal refOuakouak, B.E., Zegrar, S.E. and Arslan, H., 2025. CP-Aware OFDM-Based OOK Signaling. IEEE Wireless Communications Letters, 15, pp.935-939
