As the uplink sensing has the advantage of easy implementation, it attracts great attention in integrated sensing and communication (ISAC) system. This paper presents an uplink ISAC system based on multi-input multi-output orthogonal frequency division multiplexing (MIMO-OFDM) technology. The mutual information (MI) is introduced as a unified metric to evaluate the performance of communication and sensing. In this paper, firstly, the upper and lower bounds of communication and sensing MI are derived in details based on the interaction between communication and sensing. And the ISAC waveform is optimized by maximizing the weighted sum of sensing and communication MI. The Monte Carlo simulation results show that, compared with other waveform optimization schemes, the proposed ISAC scheme has the best overall performance.

翻译：由于上行感知具有易于实现的优势，其在集成感知与通信（ISAC）系统中引起了广泛关注。本文提出了一种基于多输入多输出正交频分复用（MIMO-OFDM）技术的上行ISAC系统。引入互信息（MI）作为统一度量，用于评估通信与感知的性能。本文首先基于通信与感知之间的交互作用，详细推导了通信与感知互信息的上下界，并通过最大化感知与通信互信息的加权和来优化ISAC波形。蒙特卡洛仿真结果表明，与其他波形优化方案相比，所提出的ISAC方案具有最佳的整体性能。