Advanced Signal Processing Enabled Massive MIMO With NOMA

先进的信号处理通过 NOMA 实现大规模 MIMO

• 批准号: RGPIN-2020-06815
• 负责人: Zhu, WeiPing
• 金额: $ 2.84万
• 依托单位: Concordia University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=741451
• 关键词: Advanced; Signal; Processing; Enabled; Massive

The capacity of current wireless networks is becoming a major bottleneck as most of the radio frequency bandwidth has already been allocated for specific services. In contrast, millimeter-wave (mmWave) communication operating within the 30-300GHz frequency band is a promising technology for the 5th generation (5G) and beyond (B5G) wireless networks. Due to its abundant bandwidth and short wavelength, mmWave enables much higher capacities and transmission rates than conventional microwave communications (e.g., Sub-6 GHz). Moreover, its short wavelength allows a large number of antennas to be deployed in the base station and multiple antennas to be integrated in a small hand-held device, making massive multiple-input multiple-output (MIMO) systems go hand-in-hand with mmWave networks. On the other hand, non-orthogonal multiple access (NOMA), as a potential technology to boost system spectral and energy efficiencies, has recently received a great deal of attention. NOMA allows multiple users to access networks at the same time and frequency resource block, and separates the signals of different users by allocating different power levels according to channel state information (CSI). Despite many advantages of mmWave communication using massive MIMO and NOMA, however, there are technical challenges in implementing such a complex system. These include requiring extensive CSI, which is difficult to acquire under massive MIMO, and many radio-frequency (RF) chains for the antenna elements. Moreover, mmWave signals experience severe path loss, high penetration loss and harsh atmospheric absorption as compared to micro-wave signals, and therefore directional transmission with sharp beam is required to overcome the severe path loss of mmWave signals. In addition, NOMA inevitably introduces interferences between multiple users that share nonorthogonal resources at the same time and frequency. In this project, we investigate and develop novel signal processing approaches to tackle the fundamental challenges in massive MIMO-NOMA systems operating at mmWave frequencies for future B5G networks. The long-term objective of this proposal is to design enabling signal processing technologies for massive MIMO-NOMA systems in support of B5G wireless communications. The short-term objectives include (1) design of novel channel estimation techniques for mmWave massive MIMO systems; (2) optimization of transceiver beamforming and beam-tracking; (3) NOMA user clustering and power allocation; and (4) performance evaluation of mmWave MIMO-NOMA systems. The proposed project also involves significant training activities for both undergraduate and graduate students as well as post-doctoral research fellows that will take place at Concordia University.

当前无线网络的容量正在成为主要瓶颈，因为大部分射频带宽已经分配给特定服务。相比之下，在 30-300GHz 频段内运行的毫米波 (mmWave) 通信对于第五代 (5G) 及更高版本 (B5G) 无线网络来说是一项很有前景的技术。由于其丰富的带宽和短波长，毫米波比传统微波通信（例如 Sub-6 GHz）具有更高的容量和传输速率。此外，其短波长允许在基站中部署大量天线，并将多个天线集成在小型手持设备中，从而使大规模多输入多输出（MIMO）系统齐头并进与毫米波网络。另一方面，非正交多址（NOMA）作为一种提高系统频谱和能源效率的潜在技术，最近受到了广泛关注。 NOMA允许多个用户同时和频率资源块接入网络，并根据信道状态信息（CSI）分配不同的功率级别来分离不同用户的信号。 尽管使用大规模 MIMO 和 NOMA 的毫米波通信具有许多优势，但实现如此复杂的系统仍存在技术挑战。其中包括需要广泛的 CSI（这在大规模 MIMO 下很难获得）以及天线元件的许多射频 (RF) 链。此外，与微波信号相比，毫米波信号存在严重的路径损耗、高穿透损耗和恶劣的大气吸收，因此需要采用锐波束定向传输来克服毫米波信号严重的路径损耗。此外，NOMA不可避免地会引入同时和频率共享非正交资源的多个用户之间的干扰。在这个项目中，我们研究并开发了新颖的信号处理方法，以应对未来 B5G 网络在毫米波频率下运行的大规模 MIMO-NOMA 系统的基本挑战。该提案的长期目标是为大规模 MIMO-NOMA 系统设计支持 B5G 无线通信的信号处理技术。短期目标包括（1）为毫米波大规模 MIMO 系统设计新颖的信道估计技术； (2) 收发器波束形成和波束跟踪的优化； (3) NOMA用户聚类和功率分配； (4)毫米波MIMO-NOMA系统的性能评估。拟议的项目还涉及将在康考迪亚大学为本科生和研究生以及博士后研究员进行的重要培训活动。