单站ISAC系统中零填充OFDM的性能分析
On the Performance Analysis of Zero-Padding OFDM for Monostatic ISAC Systems
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中文总结 AI 辅助
本文针对单站ISAC系统研究ZP-OFDM传输的感知性能，推导检测概率与距离比较表达式，得出25% FFT长度的ZP仅带来17%额外距离损失的结论，为系统参数选择提供依据。
中文摘要 AI 辅助
本文研究采用零填充正交频分复用（ZP-OFDM）下行传输、具备单站雷达功能的集成感知与通信（ISAC）系统。我们聚焦ISAC的感知层面，采用能量检测（ED）方法。选择ZP-OFDM传输的动因在于，感知可在发射机的静默期内执行，从而无需进行循环前缀（CP）-OFDM所需的带内全双工操作自干扰（SI）对消处理。此外，我们还证明ZP-OFDM能够抑制近程杂波干扰。我们推导了ZP系统与CP-OFDM系统的检测概率（PD），可用于开展有效的性能分析。具体而言，我们表明PD表达式可给出ZP-OFDM传输的性能上界，这对于为给定系统配置选择最佳ZP长度十分有用。我们还给出了可用于ZP与CP-OFDM之间作用距离比较的表达式，其中我们考虑了CP-OFDM系统存在非理想SI对消的一般情况。结果表明，当ZP长度为快速傅里叶变换长度的25%时，ZP系统的距离损失仅比CP传输大17%。
英文摘要
This paper considers an integrated sensing and communication (ISAC) system with monostatic radar functionality using a zero-padding orthogonal frequency division multiplexing (ZP-OFDM) downlink transmission. We focus on ISAC's sensing aspect, employing an energy-detection (ED) method. The ZP-OFDM transmission is motivated by the fact that sensing can be performed during the silent periods of the transmitter, thereby avoiding self-interference (SI) cancellation processing of the in-band full duplex operation, which is needed for the cyclic prefix (CP)-OFDM. Additionally, we also show that ZP-OFDM can reject nearby clutter interference. We derive the probability of detection (PD) for the ZP and CP-OFDM systems, allowing useful performance analyses. In particular, we show that the PD expressions lead to an upper bound for the ZP-OFDM transmission, which is useful for selecting the best ZP size for a given system configuration. We also provide an expression that allows range comparison between ZP and CP-OFDM, where we consider a general case of imperfect SI cancellation for the CP-OFDM system. The results show that when the ZP size is 25% of the fast Fourier transform size, the range loss of the ZP system range is only 17% larger than the CP transmission.
