ISAC系统中上行OFDMA的一种新型导频分配技术
A Novel Pilot Allocation Technique for Uplink OFDMA in ISAC Systems
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中文总结 AI 辅助
针对上行OFDMA ISAC系统中交织导频限制无模糊距离和降低CIR估计精度的问题，提出基于循环前缀的相移重叠块导频分配方法，实现了高效多发射机导频分离，提升了CIR分离与MSE性能并最大化无模糊距离。
中文摘要 AI 辅助
在集成感知与通信（ISAC）系统中，导频信号因其强自相关性和高发射功率，在提升感知性能方面发挥着关键作用。然而，与连续正交频分多址（OFDMA）信号相比，传统的交织导频固有地限制了最大无模糊距离，并降低了信道冲激响应（CIR）估计的精度。为了应对这一挑战，我们提出了一种用于基于上行OFDMA的ISAC系统的新型重叠块导频结构，称为相移ISAC（PS-ISAC）导频分配。该方法采用基于循环前缀（CP）的相移导频设计，能够在接收端实现高效的多发射机导频分离。仿真结果证实，所提方案增强了CIR分离效果，降低了计算复杂度，并在实际功率约束下改善了均方误差（MSE）性能。此外，我们证明利用连续导频资源能够最大化无模糊距离。
英文摘要
In integrated sensing and communication (ISAC) systems, pilot signals play a crucial role in enhancing sensing performance due to their strong autocorrelation properties and high transmission power. However, conventional interleaved pilots inherently constrain the maximum unambiguous range and reduce the accuracy of channel impulse response (CIR) estimation compared to continuous orthogonal frequency-division multiple access (OFDMA) signals. To address this challenge, we propose a novel overlapped block-pilot structure for uplink OFDMA-based ISAC systems, called phase-shifted ISAC (PS-ISAC) pilot allocation. The proposed method leverages a cyclic prefix (CP)-based phase-shifted pilot design, enabling efficient multi-transmitter pilot separation at the receiver. Simulation results confirm that the proposed scheme enhances CIR separation, reduces computational complexity, and improves mean square error (MSE) performance under practical power constraints. Furthermore, we demonstrate that utilizing continuous pilot resources maximizes the unambiguous range.
