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arXiv 2202.02688cs.ITmath.IT
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传感与通信系统导频优化、目标检测和信道估计的联合算法

Joint Pilot Optimization, Target Detection and Channel Estimation for Integrated Sensing and Communication Systems

Zhe Huang, Kexuan Wang, An Liu, Yunlong Cai, Rui Du, Tony Xiao Han

摘要:

雷达传感将被集成到6 G通信系统中,以支持各种应用。在这种集成传感和通信系统中,雷达目标也可以是通信信道散射体。在这种情况下,雷达和通信信道表现出一定的联合突发稀疏性。我们提出了一个两阶段的联合导频优化,目标检测和信道估计方案,利用这种联合突发稀疏性和导频波束形成增益,以提高检测/估计性能。在阶段1中,基站(BS)发送用于初始目标搜索的下行链路导频(DP),并且用户发送用于信道估计的上行链路导频(UP)。然后,BS基于反射的DP和接收的UP信号执行联合目标检测和信道估计。在阶段2中,BS利用在阶段1中获得的先验信息来优化DP信号以实现波束成形增益并进一步改善性能。提出了一种Turbo稀疏贝叶斯推理算法,用于联合目标检测和信道估计。第二阶段中的驾驶员优化问题是具有秩-1约束的半定规划。通过将秩-1约束替换为一个紧而光滑的近似,提出了一种基于优化最小化方法的高效导频优化算法。仿真结果验证了该方案的优越性。

英文摘要:

Radar sensing will be integrated into the 6G communication system to support various applications. In this integrated sensing and communication system, a radar target may also be a communication channel scatterer. In this case, the radar and communication channels exhibit certain joint burst sparsity. We propose a two-stage joint pilot optimization, target detection and channel estimation scheme to exploit such joint burst sparsity and pilot beamforming gain to enhance detection/estimation performance. In Stage 1, the base station (BS) sends downlink pilots (DP) for initial target search, and the user sends uplink pilots (UP) for channel estimation. Then the BS performs joint target detection and channel estimation based on the reflected DP and received UP signals. In Stage 2, the BS exploits the prior information obtained in Stage 1 to optimize the DP signal to achieve beamforming gain and further refine the performance. A Turbo Sparse Bayesian inference algorithm is proposed for joint target detection and channel estimation in both stages. The pilot optimization problem in Stage 2 is a semi-definite programming with rank-1 constraints. By replacing the rank-1 constraint with a tight and smooth approximation, we propose an efficient pilot optimization algorithm based on the majorization-minimization method. Simulations verify the advantages of the proposed scheme.

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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