Dual-Function Radar Communcation System: Joint Design and Optimization

联合通信和感知(JCAS)技术被认为是解决下一代无线网络及以后的频谱拥塞问题的一种很有前途的技术，即通信和雷达系统将集成在一个硬件平台上，并在同一频率上同时工作。DFRC-DESIGN项目的总体目标是设计、分析和验证能够实现更高频谱效率的创新JCA系统。为了在通信和侦听功能之间取得比现有系统更好的折衷性能，我们将把系统的设计原则从现有的以系统的主要功能为基础实现第二功能的原则转变为同时考虑这两个功能的联合设计原则。为了实现这一点，我们的设计中出现了以下挑战：i)如何定义JCA的性能度量？Ii)如何设计满足通信和侦听所需特性的波形？Iii)如何利用MIMO系统中波束的空间特性来同时检测目标和服务于不同方向的用户？Iv)如何处理杂波信号，以实现稳健和高精度的传感？V)在实际情况下，JCAS系统在这两个功能上可以获得多大的性能提升？在这个项目中，将提出一个理论分析框架、新的波形设计、混合波束形成算法、杂波抑制和参数估计程序，以解决这些问题，运用最优化理论、统计信号处理和深入学习技术。此外，还将在现实环境下建立试验台，对所提出的方案进行演示。结果将通过几项传播活动向公众传播，以提高公众对毫米波的认识，促进相互了解和可持续发展。

The joint communication and sensing (JCAS) technology is considered as a promising technology for solving the spectrum congestion problem in next generation of wireless networks and beyond, where the communication and radar system will be integrated in one hardware platform and operate simultaneously over the same frequency. The overarching goal of the DFRC-DESIGNproject is to design, analyze and validate innovative JCAS systems capable of achieving improved spectrum efficiency. To have a better trade-off performance between communication and sensing functionalities compared to the existing systems, we will make aparadigm shift in the design principles of the system from the existing principle of realizing a second function based on the primaryfunction of the system to the joint design principle that considers both functions simultaneously. To achieve this, the following challenges arise in our design: i) How to define the performance metrics of JCAS? ii) How to design waveforms that satisfy the properties required for both communication and sensing? iii) How to exploit the spatial characteristics of the beam in a MIMO system to simultaneously detect targets and serve users in different orientations? iv) How to tackle the clutter signal for robust and highaccuracy sensing? v) How much performance gain can the JCAS system achieve for both functions in realistic situations? In this project, a theoretical analysis framework, novel waveform design, hybrid beamforming algorithms, clutter suppression and parameterestimation procedures will be proposed to address these issues, using optimization theory, statistical signal processing and deeplearning techniques. Furthermore, a testbed will be set up under realistic settings to demonstrate the proposed schemes. The results will be disseminated to the public through several communication activities to improve public awareness of milimeter waves and to promote mutual understanding and sustainable development.