| 地空通信调制解调关键技术分析 |
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| 引用本文： | 韩冬,李志勇,张琳.地空通信调制解调关键技术分析[J].无线电通信技术,2012,38(3):29-31,46. |
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| 作者姓名： | 韩冬 李志勇 张琳 |
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| 作者单位： | 中国电子科技集团电子第五十四研究所,河北石家庄,050081 |
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| 摘 要： | 针对地空通信中的多径时延展宽引起的严重的码间干扰和信道时变以及多谱勒频移等问题,介绍了调制解调中的关键技术,分析了自适应均衡技术和LDPC编码原理,提出了均衡器-解调器联合设计结构和LDPC编解码实现方法,给出了均衡器–解调器联合设计的解调器仿真结果以及采用LDPC的解调器误码曲线。该2项技术对通信的质量和系统的传输可靠性有明显的改善。
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| 关 键 词： | 地空通信 自适应均衡 LDPC 多径 |
Analysis of the Key Technologies of Modulation and Demodulation in Ground-Air Communication System |
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| HAN Dong,LI Zhi-yong,ZHANG Lin.Analysis of the Key Technologies of Modulation and Demodulation in Ground-Air Communication System[J].Radio Communications Technology,2012,38(3):29-31,46. |
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| Authors: | HAN Dong LI Zhi-yong ZHANG Lin |
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| Affiliation: | ( The 54th Research Institute of CETC, Shijiazhuang Hebei 050081, China) |
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| Abstract: | To the problems on Ground-Air communication system in terms of the high Inter-symbol interference caused by multipath time delay spread, channel time-variation, and Micro-Doppler frequency shift, this paper introduces the key technologies of modulation and demodulation. It analyses the technology of adaptive equalization and the principle of LDPC code,presents the joint design of software architecture for the equalization and the demodulation,introduces the implementation of LDPC code. Finally, the paper presents the simulation results of the joint design of the equalization and the demodulation,and testing SNR curves of demodulation using LDPC. The stability and reliability of demodulation greatly improves by using the two technologies. |
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| Keywords: | Ground-Air communication adaptive equalization LDPC multi-path |
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