分布式通信系统安全防护关键技术研究

可疑目标的位置信息可以帮助通信网络更好地针对该目标实施反监听反干扰。为保障通信系统的信息传输安全，我们将研究基于目标探测的分布式通信网络的安全防护方法，利用网络中密集布设的基站和基站的边缘计算能力实现对未知目标的定位跟踪，同时保证探测过程中的信息安全。发展基于大规模MIMO-OFDM的分布式被动协同探测方法和基于探通一体化信号的主动协同探测方法，实现在保证通信性能的条件下，对未知目标的精准定位和跟踪。在被动探测中，我们将研究在传输带宽、边缘计算能力受限条件下的分布式协同探测方法，以及对多个运动目标进行探测的基站选择和多目标跟踪方法。在主动探测中，我们将利用通信信号的空间频率自由度，优化一体化信号的波束成形、资源分配和调制方式，实现通信探测性能的最佳折中。为保障探测信号中的通信信息不被目标监听，我们还将从物理层安全的角度研究能保证安全通信和探测性能的资源分配方案和探测信号辅助的安全传输方法。

To eliminate threats from suspicious targets, we will develop security defense methods based on target detection for distributed communication network. Based on the existing communication infrastructure, we build a distributed MIMO radar system, which can be used to detect the unknown targets in the coverage of communication network. we will investigate the detection theory based on massive MIMO-OFDM, and propose distributed cooperative passive sounding methods and active probing methods to realize the accurate location and tracking of unknown targets without sacrificing the communication quality. In the passive sounding, we will study distributed cooperative detection under the constraints of transmission bandwidth and computing power. Also, for moving targets, the selection of base stations and multi-target tracking will be studied. In the active probing, we will optimize the beamforming, subcarrier and power allocation, modulation form of integrated radar-communication signals by utilizing freedom of space and frequency to achieve the best tradeoff between communication quality and sensing performance. To prevent information bearing in probing signals being eavesdropped by unknown targets, we will investigate the resource allocation schemes and detection signal assisted transmission to simultaneously perform both secure transmission and radar sensing.