TD-LTE系统中工程实用的发射通道幅度校准方法  

Engineering-Practical Transmission-path Amplitude Calibration Methods for TD-LTE Systems

作　　者：曹峥[1] 樊迅[1] 

机构地区：[1]上海贝尔股份有限公司,上海201206

出　　处：《电讯技术》2011年第9期20-26,共7页Telecommunication Engineering

基　　金：国家科技重大专项(2010ZX03002-006)~~

摘　　要：为了解决宽带TD-LTE系统中传统发射通道幅度校准在通道幅频特性不平坦时校准性能不理想的问题,根据利用子载波发送信号长短时功率统计特性的不同,提出了两种基于"能量归一化"预均衡的校准方法:长时预均衡和短时预均衡,对它们的性能、特点进行了理论分析和仿真研究,并结合工程应用对相关问题进行了深入讨论。仿真结果表明,由于有针对性地将"能量归一化"的预均衡与系统中的闭环增益控制(CLGC)功能相结合,所提方法可以有效补偿发射通道幅频特性不平坦,获得比传统方法更好的校准性能。所提方法及其分析结论为宽带TD-LTE系统中高性能发射通道校准的工程实现提供了参考依据。To improve the degraded performance of the traditional transmission-path amplitude calibration method in the case of unflat transmission-path amplitude-frequency characteristics in wideband TD - LTE systems, this paper proposes two energy-normalized-pre-equalization-based transmission-path amplitude calibration methods： the long-term pre-equalization and the short-term pre-equalization, distinguished according to the difference in the used（long or short term） sub-carrier transmission-signal power statistics. The performance and characteristics of the methods are studied by theoretical analysis and simulation investigation, and the engineering application related problems for them are deeply discussed. Simulation results show that, by elaborately combining the energy-normalized pre-equalization and the close-loop gain control（CLGC） function in systems, the proposed methods can effectively combat the unflatness of transmission-path amplitude-frequency-response and hence obtaining better calibration performance than the traditional one. The proposed methods and the corresponding analysis conclusions in this paper provide a reference for the high-performance-transmission-path-calibration en- gineering implementation in wideband TD-LTE systems.

关 键 词：TD-LTE 波束赋形 通道校准 幅度校准 预均衡 

分 类 号：TN929.5[电子电信—通信与信息系统]