摘要
多天线技术是移动通信技术发展的重要趋势,是实现移动通信系统高容量、高频谱效率的重要手段。LTE系统引入了多向多天线技术,并定义了多种多天线的工作模式,其中基于非码本预编码的智能天线是TD-LTE的核心技术,可以充分利用TDD的上下行信道互易性,显著提升系统的吞吐量和频谱效率。本文从理论上给出了2天线及8天线在TD-LTE系统性能上的差异,并且分析了8天线智能天线技术在实际应用中可能面临的挑战,从广播信道的无功率加权、下行链路质量估计补偿、SRS协调发送、多用户配对算法优化、接收机性能增强等角度对智能天线的产品实现进行优化,可提升性能10%～30%。
Multiple input and multiple output （MIMO） is a key technology to provide high data rate and high spectrum efficiency for mobile communication system. LTE system has defined many MIMO transmission modes to adapt to different application scenarios. Beamforming based on the non-codebook pre-coding is the core technology of TD-LTE, which can make full use of TDD uplink and downlink channel reciprocity characteristics, and significantly improve the system throughput and spectrum efficiency. This paper theoretically presents the performance gap between the two-antenna and eight-antenna in TD-LTE system, and analyzes the possible challenges when eight-antenna beamforming is deployed in commercial mobile network. Then based on the product implementation, the broadcasting beam optimization, compensated channel quality estimation, coordinated SRS, modified multiuser pairing algorithm and receiver enhancement are proposed to improve the system performance, and the 10% to 30% performance gain is achieved.
出处
《电信科学》
北大核心
2012年第11期142-147,共6页
Telecommunications Science
基金
国家科技支撑项目(No.2008BAH30B11)
国家重大专项基金资助项目(No.22008ZX03003-002-002)
