Multi-antenna Communications with Finite-Rate Feedback

下一代无线标准旨在为移动的用户提供高速通信。在不增加功率或频谱的情况下，可以显著提高信息速率的两种最有前途的技术是利用多天线和从接收机到发射机的有限速率反馈的技术。在发射机处的边信息的益处在恰好符合移动的设备的高速下行链路通信的要求的机制中是显著的，其中发射天线多于接收天线。在后第三代无线技术中，大多数技术，如WiMax、Super 3G/LTE（长期演进）、802.11n，都采用MIMO-OFDM技术。预计这项研究将导致显着提高频谱效率的方法，在这些technology.The建议的研究是在无线通信范围从其基本的信息理论基础的分析和优化的新颖和实用的通信架构，利用几个比特的反馈每个信道的实现。机制存在提供有限速率反馈和方法，通过该方法可以利用这种反馈的无线信道波动将被调查。由于多天线系统的巨大潜力，有限速率反馈的基本限制，即遍历和中断容量，将被表征和低复杂度的方法与接近最优的性能将被设计和分析用于单载波和多载波（OFDM）系统的多天线（MIMO）通信。这些问题的性质是在拟议的研究的核心需求跨信息理论，量化，纠错编码，随机矩阵和大偏差理论领域的合作。这项研究还有望激发新的数学发现，这些发现有望在其他领域找到更广泛的应用。

The next generation of wireless standards are aimed at providing high speed communication to mobile users. Two of the most promising technologies that can dramatically increase the information rate without the increase of power or spectrum are those that exploit multiple antennas and finite-rate feedback from the receiver to the transmitter. The benefit of side information at the transmitter is significant in regimes that happen to fit the requirements of high speed downlink communication by mobile devices, where there are more transmit than receive antennas. Among the post Third Generation wireless technologies, most of them, such as WiMax, Super3G/LTE (Long Term Evolution), 802.11n, employ MIMO-OFDM technology. It is anticipated that this research will lead to methods for significantly increased spectral efficiencies in these technologies.The proposed research is on wireless communications ranging from its fundamental underpinnings in information theory to the analysis and optimization of novel and practicable communication architectures that exploit a few bits of feedback per channel realization. Mechanisms exist for providing finite-rate feedback and methods by which the wireless channel fluctuations can be exploited with this feedback will be investigated. Because of the enormous potential of multi-antenna systems, the fundamental limits with finite-rate feedback, namely ergodic and outage capacities, will be characterized and low complexity methods with near-optimal performance will be designed and analyzed for multi-antenna (MIMO) communication for single- and multi-carriers (OFDM) systems. The nature of the problems which are at the heart of the proposed research demand collaboration across the fields of information theory, quantization, error-correction coding, random matrices and large deviation theory. This research is expected to also motivate new mathematical discoveries that are expected to find broader applications in other areas.