| 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。 |
| 关键词: TD-LTE 波束赋形 通道校准 幅度校准 预均衡 |
| DOI： |
|
| 基金项目:国家科技重大专项（2010ZX03002-006） |
|
| Engineering-practical transmission-path amplitude calibration methods for TD-LTE systems |
| CAO Zheng,FAN Xun |
| (AlcatelLucent Shanghai Bell Co., Ltd., Shanghai 201206, China) |
| Abstract: |
| To improve the degraded performance of the traditional transmissionpa
th amplitude calibration method in the case of unflat transmissionpath amplitu
d
efrequency characteristics in wideband TD-LTE systems, this paper proposes tw
o
energynormalizedpreequalizationbased transmissionpath amplitude calibr
ation
methods: the longterm preequalization and the shortterm preequalization
, di
stinguished according to the difference in the used(long or short term) subca
r
rier transmissionsignal power statistics. The performance and characteristics
o
f 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 energynormalized pr
e
equalization and the closeloop gain control(CLGC) function in systems, the
pr
oposed methods can effectively combat the unflatness of transmissionpath ampli
t
udefrequencyresponse and hence obtaining better calibration performance than
th
e
traditional one. The proposed methods and the corresponding analysis conclusions
in this paper provide a reference for the highperformancetransmissionpath
calibration engineering implementation in wideband TDLTE systems. |
| Key words: TD LTE beam forming path calibration amplitude calibration pre-equalization |
《电讯技术》编辑部 