VLEO ISAC-SAR中使用CP-OFDM的成像-通信权衡
Imaging-Communication Trade-off in VLEO ISAC-SAR Using CP-OFDM
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中文总结 AI 辅助
本文针对VLEO ISAC-SAR，建立统一分析框架，推导图像域统计特性并提出ENESZ指标，揭示CP持续时间作为设计参数在成像质量与通信吞吐量之间的可扩展权衡。
中文摘要 AI 辅助
本文研究了在甚低地球轨道（VLEO）集成感知与通信合成孔径雷达（ISAC-SAR）中，使用循环前缀正交频分复用（CP-OFDM）作为共享波形的成像-通信权衡问题。我们建立了一个统一的分析框架，该框架同时考虑了随机通信载荷、跨测绘带的距离相关CP不足以及合成孔径上的慢时变平台多普勒效应。所得信号模型通过公共子载波耦合系数，将相干保留分量与载波间干扰（ICI）和符号间干扰（ISI）分离开来。通过将这些效应传播至接收滤波、距离压缩和方位聚焦过程，我们推导了匹配滤波器和倒数滤波器接收机的图像域统计特性。基于推导的统计特性，我们提出了有效噪声等效后向散射系数（ENESZ），用于在共同的后向散射等效尺度上表征数据相关旁瓣、ICI/ISI和噪声增强。分析表明，CP持续时间作为系统级设计参数，带来了可扩展的权衡。增加CP可改善相干保留并抑制距离相关干扰，但同时降低了相干处理增益和通信载荷吞吐量。因此，足够的CP持续时间通常与成像最优的CP持续时间不一致。针对代表性VLEO场景的端到端仿真验证了所推导的图像域统计特性，并展示了ENESZ与通信吞吐量随CP持续时间变化的权衡结果。
英文摘要
This paper investigates the imaging--communication trade-off in very-low-Earth-orbit (VLEO) integrated sensing and communication synthetic aperture radar (ISAC-SAR) using cyclic-prefix orthogonal frequency-division multiplexing (CP-OFDM) as the shared waveform. We develop a unified analytical framework that jointly accounts for random communication payloads, range-dependent CP deficit across the swath, and slow-time-varying platform Doppler over the synthetic aperture. The resulting signal model separates the coherently retained component from inter-carrier interference (ICI) and inter-symbol interference (ISI) through common subcarrier-coupling coefficients. By propagating these effects through receive filtering, range compression, and azimuth focusing, we derive image-domain statistics for matched- and reciprocal-filter receivers. Based on the derived statistics, an effective noise-equivalent sigma zero (ENESZ) is formulated to characterize data-dependent sidelobes, ICI/ISI, and noise enhancement on a common backscatter-equivalent scale. The analysis reveals that the CP duration acts as a system-level design parameter bringing scalable trade-off. Increasing the CP improves coherent retention and suppresses range-dependent interference, but simultaneously reduces coherent processing gain and communication payload throughput. Accordingly, the sufficient-CP duration does not generally coincide with the imaging-optimal CP duration. End-to-end simulations for a representative VLEO scenario validate the derived image-domain statistics and demonstrate the resulting trade-off between ENESZ and communication throughput as a function of CP duration.
发表机构
- Ulsan National Institute of Science and Technology（蔚山科学技术院）
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