Waveform Design for Integrated Sensing and Communication Systems Based on Interference Exploitation

Tian Liu;Yinghong Guo;Lingfeng Lu;Bin Xia
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Abstract

Integrated sensing and communication (ISAC) is a spectrum and energy efficient approach to realizing dual functions by a unified hardware platform. In this paper, we consider a multiple-input multiple-output (MIMO) ISAC system, where the transmitted waveform consisting of communication signals and dedicated sensing signal is optimized for dual purposes of estimating targets and serving downlink single-antenna users. Specifically, the sensing interference and multi-user interference are exploited, rather than suppressed, by the waveform design scheme. The joint waveform design problem is formulated by maximizing the constructive interference (CI) while ensuring the power budget and waveform similarity error with the benchmark signal, which limits the sensing estimation accuracy. To obtain the benchmark signal which achieves the optimal estimation performance, we propose a semidefinite relaxation based algorithm to solve the optimization problem. For clarity, we derive the real representation of the complex joint waveform design problem and prove its convexity. Numerical results verify the superiority of the proposed CI-based waveform design when the interference was efficiently exploited as a useful signal source achieving favorable symbol error ratio performance. Moreover, the dedicated sensing signal provides more degree of freedom for waveform design.
基于干扰开发的集成传感与通信系统波形设计
集成传感与通信(ISAC)是一种通过统一的硬件平台实现双功能的频谱和节能方法。在本文中,我们考虑了一个多输入多输出(MIMO) ISAC系统,其中由通信信号和专用传感信号组成的传输波形进行了优化,以达到估计目标和服务下行单天线用户的双重目的。具体来说,波形设计方案利用而不是抑制传感干扰和多用户干扰。联合波形设计问题是在保证功率预算和与基准信号的波形相似误差的情况下,最大限度地提高建设性干扰(CI),从而限制了感知估计的精度。为了获得最优估计性能的基准信号,我们提出了一种基于半定松弛的算法来解决优化问题。为了清楚起见,我们推导了复杂关节波形设计问题的真实表示,并证明了其凸性。数值结果验证了基于ci的波形设计的优越性,有效地利用了干扰作为有用的信号源,实现了良好的符号误码率性能。此外,专用的传感信号为波形设计提供了更大的自由度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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