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arXiv 2302.01153cs.ITeess.SPmath.IT
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近场集成感知与通信

Near-Field Integrated Sensing and Communications

Zhaolin Wang, Xidong Mu, Yuanwei Liu

AI总结:

本文提出近场ISAC框架,利用额外距离维度联合优化感知与通信,推导克拉美罗界并在通信速率约束下最小化,针对全数字和混合天线分别给出全局最优与高质量波形解,验证了其相对远场ISAC的性能增益。

摘要:

提出了一种近场集成感知与通信(ISAC)框架,与传统的远场系统相比,该框架为感知和通信引入了一个额外的距离维度。特别地,推导了近场联合距离与角度感知的克拉美罗界,并在满足每个用户最小通信速率要求的条件下使其最小化。研究了全数字天线和混合数字模拟天线两种情况。对于全数字天线,通过半定松弛获得了ISAC波形的全局最优解。对于混合天线,通过两阶段优化获得了高质量解。数值结果表明,近场ISAC所引入的额外距离维度相较于远场ISAC带来了性能增益。

英文摘要:

A near-field integrated sensing and communications (ISAC) framework is proposed, which introduces an additional distance dimension for both sensing and communications compared to the conventional far-field system. In particular, the Cramer-Rao bound for the near-field joint distance and angle sensing is derived, which is minimized subject to the minimum communication rate requirement of each user. Both fully digital antennas and hybrid digital and analog antennas are investigated. For fully digital antennas, a globally optimal solution of the ISAC waveform is obtained via semidefinite relaxation. For hybrid antennas, a high-quality solution is obtained through two-stage optimization. Numerical results demonstrate the performance gain introduced by the additional distance dimension of the near-field ISAC over the far-field ISAC.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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