Robust adaptive beamforming for multi-antenna systems

在多天线收发器的下一代蜂窝移动无线电系统中，自适应波束形成技术是空间选择性信号接收（上行波束形成）和传输（下行波束形成）的关键技术，是近年来新兴的研究热点。利用天线阵列的空间选择性，接收和发射波束形成有利于系统容量的增加和发射功率的降低。因此，多天线技术展示了支持高数据速率的潜力，同时使用更少的功率。然而，这些可以通过可能增加发射器和接收器的计算复杂性来实现。因此，多天线技术提出了传统设计技术无法直接解决的优化挑战。我们在这个项目中的研究旨在解决这些挑战。在设计自适应波束形成器时，必须解决鲁棒性问题。事实上，传统的自适应波束形成技术是为理想的信号和信道模型而开发的。然而，在实践中出现的各种缺陷会对系统性能产生有害的影响。该项目的主要目标是捕捉稳健多天线系统设计的基本方面。实现这一目标，特别是考虑到鲁棒性问题，将有助于定义超越第三代（B3G）无线系统。

In the future-generation cellular mobile radio systems with base stations equipped by multi-antenna transceivers, the use of adaptive beamformers is a key technology for spatially selective signal reception (uplink beamforming) and transmission (downlink beamforming) which has recently emerged and is now an area of intensive research. Using the spatial selectivity of antenna arrays, the receive and transmit beamforming facilitates an increase in system capacity and a decrease in the transmission power. Thus, multi-antenna technology demonstrates the potential to support high data rates while at the same time using less power. However, these can be achieved by possibly increasing the computational complexity of the transmitter and receiver. As a result, multi-antenna technology poses optimization challenges that conventional design techniques cannot resolve directly. Our research within this project aims at resolving such challenges. In designing adaptive beamformers, the robustness issues have to be addressed. Indeed, the conventional adaptive beamforming techniques are developed for idealized signal and channel models. However, various imperfections, which occur in practice, can have deleterious effects on system performance. The main objective of this project is to capture the essential aspects of robust multi-antenna system design. Achieving this objective is expected to contribute, specifically, to defining beyond 3rd generation (B3G) wireless systems by taking into account the robustness issues.