毫米波多用户大规模MIMO信道估计理论方法研究

Theories and key technologies of wireless transmission for the future mobile communications are looking for breakthroughs to meet requirements of mobile Internet and Internet +. The mobile communication technology in higher frequency bands up to and including millimeter-wave bands becomes one of key wireless technologies. Recently, theories and methods for the massive MIMO have been intensively investigated. Therefore, for millimeter-wave mobile communications and based on the architecture of the future mobile communications, beam-domain channel modelling, channel state information acquisition for the millimeter-wave multi-user (MU) massive MIMO estimation, and channel estimation under hardware constraints will be investigated in this project. For channel modelling, beam-domain MIMO correlation characteristics is mainly investigated using channel measurement data in the typical scenarios, which is a basis for a new design of wireless transmission. For channel estimation, according to the characteristics of millimeter-wave MU massive MIMO, hardware conditions, channel conditions, signal structure, and hybrid precoding, sequence design for time and frequency synchronization and the synchronization algorithm at the receiver are investigated. Furthermore, the pilot and insertion scheme and the efficient channel estimation and tracking algorithm are also investigated. Finally, using signal distortion models, the capacity bounds are expected to be derived under the non-ideal hardware condition. And the efficient and robust channel estimation under real hardware constraints are also investigated. The research results of this project are expected to establish theoretical and technical foundation for the future large-scale mobile communications.

为应对移动互联网和互联网＋的需求，未来移动通信无线传输理论和技术有待继续突破。毫米波通信是解决超高容量密度和超高速率传输的关键技术之一。目前，大规模MIMO理论和方法已得到深入研究。本项目研究毫米波多用户大规模MIMO的波束域信道建模、导频设计与信道估计理论与方法，以及实际硬件约束下的信道估计方法。针对信道建模，利用典型场景的信道实测数据，重点研究波束域多用户大规模MIMO相关信道模型，为无线传输方案设计奠定信道模型基础。针对导频设计与信道估计，根据系统特点、信号格式、硬件条件和信道状况，结合混合编码方式，提出同步序列的优化设计和时频同步方法，并提出高效的信道估计与跟踪理论方法，解决导频污染，并以低复杂度获得足够精度的信道参数。针对毫米波硬件约束，通过建立信号失真的模型，解决硬件失真因素下的信道容量界，提出相适应的信道估计理论方法。预期研究成果将为大规模未来移动通信系统提供理论和技术支撑。

为应对移动互联网和互联网＋的需求，未来移动通信无线传输理论和技术有待继续突破。毫米波通信是解决超高容量密度和超高速率传输的关键技术之一。目前，大规模MIMO理论和方法已得到深入研究。本项目研究了毫米波多用户大规模MIMO的波束域信道建模、导频设计与信道估计理论与方法，以及实际硬件约束下的信道估计方法。针对信道建模，利用典型场景的信道实测数据，重点研究波束域多用户大规模MIMO相关信道模型，为无线传输方案设计奠定信道模型基础。针对导频设计与信道估计，根据系统特点、信号格式、硬件条件和信道状况，结合混合编码方式，提出了同步序列的优化设计和时频同步方法，并提出高效的信道估计与跟踪理论方法，解决导频污染，并以低复杂度获得足够精度的信道参数。针对毫米波硬件约束，通过建立信号失真的模型，解决硬件失真因素下的信道容量界，提出相适应的信道估计理论方法。研究成果将为大规模未来移动通信系统提供理论和技术支撑。