大规模MIMO传输技术研究与展望

Prospects and Overview of Massive MIMO Transmission

移动互联网和物联网应用需求的持续增长,带来对无线移动通信速率和用户终端容量量级提升的技术需求。为应对此技术需求,第五代(5G)移动通信目前已经正式进入商用。大规模MIMO作为5G移动通信的关键技术之一,在5G移动通信中起着至关重要的作用,近年来被广泛研究。未来,大规模MIMO或超大规模MIMO也必将是B5G和6G移动通信的关键技术之一。本文围绕大规模MIMO导频开销、移动性增强、频段扩展等因素引发的信道信息获取瓶颈问题和信道信息非精确问题,从大规模MIMO信息理论分析基础、信道信息获取与后验信道模型、波束域鲁棒传输理论方法以及同步与控制信息传输理论方法几个方面论述其传输理论与技术,并提出未来大规模MIMO研究中具有挑战性的关键技术问题。

The continuing increase of the application demand on mobile internet and internet of things(IoT),brings the technique demand of increasing the rate and the user equipment capacity of wireless communications by an order of magnitude.To fulfill the technique demand,the fifth generation(5G)mobile communications is now in commercial use.As one of the key technologies in 5G mobile communications,massive multi-input multi-output(MIMO)plays a very important role and has been widely investigated in recent years.In the future,massive MIMO or ultra-massive MIMO will also be one of the key technologies in the beyond 5G and the sixth generation(6G)wireless communications.This paper focus on the bottleneck problem of channel estimation and the imperfect channel state information problem in massive MIMO caused by pilot overhead,mobility enhancement,the extended spectrum and etc.,reviews the massive MIMO transmission on the aspects of the information theory,channel acquisition and the posterior channel model,beam domain robust transmission,and synchronization and control information transmission,and also discusses the challenging problem in the future massive MIMO researches.