AI 中文总结
研究多小区 OFDM-ISAC 中星座选择与功率分配，开发感知干扰管理框架，推导 MF 和 RF 下 SINR 表达式，获功率分配结构，联合优化星座选择与功率分配，研究频谱重叠协调，扩展干扰模型。
AI 中文摘要
未来的集成感知与通信（ISAC）网络预计将在密集多小区环境中运行，多个基站共享时频资源进行通信和感知。在这种场景下，延迟 - 多普勒（DD）感知性能会受到随机有限字母正交频分复用（OFDM）符号、功率分配、接收滤波和干扰的强烈影响。本文为多小区 OFDM-ISAC 系统中的感知干扰管理开发了一个调制和接收滤波器感知框架，并推导了匹配滤波（MF）和互易滤波（RF）下每个距离 - 多普勒频段的闭式信干噪比（SINR）表达式，还基于这些表达式获得了面向感知的功率分配结构，联合优化了有限字母星座选择和功率分配，研究了多小区场景下的频谱重叠协调，扩展了干扰模型到小区间传播延迟超过循环前缀（CP）的情况。
英文摘要
Future integrated sensing and communication (ISAC) networks are expected to operate in dense multi-cell environments, where multiple base stations (BSs) share their time-frequency resources for communication and sensing. In such scenarios, the delay--Doppler (DD) sensing performance is strongly affected by random finite-alphabet orthogonal frequency-division multiplexing (OFDM) symbols, power allocation, receive filtering, and interference. This paper develops a modulation- and receive-filter-aware framework for the sensing-interference management in multi-cell OFDM-ISAC systems. Starting from a discrete-time OFDM sensing model, we derive closed-form signal-to-interference-plus-noise ratio (SINR) expressions for each range--Doppler bin under matched filtering (MF) and reciprocal filtering (RF). The analysis reveals distinct interference structures: MF depends on fourth-order constellation moments and power-overlap terms, whereas RF is governed by inverse-symbol-power and ratio-type interference terms. Based on these expressions, we obtain sensing-oriented power allocation structures, including a ramped water-filling solution for MF and a square-root allocation rule for RF. Furthermore, we jointly optimize the finite-alphabet constellation selection and power allocation under realistic communication and power constraints, and obtain tractable mixed-integer convex formulations for both MF and RF. Additionally, we study spectrum-overlap coordination in multi-cell scenarios and reveal the distinct MF/RF preferences for shared and orthogonalized tones. Furthermore, we extend the interference model to inter-cell propagation delays exceeding the cyclic prefix (CP), and show how the resultant delay violation redistributes the nominal interference spectrum into a delay-distorted effective spectrum...
Comments13 pages, submitted to the IEEE Journal for possible publication
