一种适合于低空无线信道的改进SC FDE技术
An improved SC FDE technique for low altitude wireless channel
作者：何礼(四川大学电子信息学院)；何培宇(四川大学电子信息学院)；张晓枫(四川大学电子信息学院)；吕多玉(四川大学电子信息学院)；张凤仪(四川大学电子信息学院)
Author：HE Li(College of Electronics and Information Engineering, Sichuan University)；HE Pei-Yu(College of Electronics and Information Engineering, Sichuan University)；ZHANG Xiao-Feng(College of Electronics and Information Engineering, Sichuan University)；LV Duo-Yu(College of Electronics and Information Engineering, Sichuan University)；ZHANG Feng-Yi(College of Electronics and Information Engineering, Sichuan University)
收稿日期：2014-06-15 年卷（期）页码：2015,52(2):306-310
期刊名称：四川大学学报: 自然科学版
Journal Name：Journal of Sichuan University (Natural Science Edition)
关键字：低空无线信道; SC FDE; 多径时延; 多普勒频移
Key words：Low altitude wireless channel; SC FDE; Multipath delay; Doppler frequency shift
基金项目：国家自然科学基金(61071159)
中文摘要
目前国内外对于低空无线信道的报道较少, 尚未建立统一的模型, 而由于多径时延和多普勒频移的影响, 传统的单载波频域均衡(SC FDE)技术在该信道下的传输性能较差. 本文在航空信道建模的基础上, 分析了不同场景下低空无线信道的传输特性, 建立了相应的信道模型. 为了在低空无线信道下获得良好的传输性能, 提出了一种基于Turbo编码和最优信号子空间(OSS)理论的改进SC FDE技术. 仿真结果表明, 该技术能很好地适应低空无线信道的特性, 可以在低信噪比(SNR)条件下获得较低的误码率(BER), 从而提升了通信系统在该信道下的传输性能.
英文摘要
There are few researches on the study of low altitude wireless channel both at home and abroad, and the unified model has not been established. Meanwhile, the transmission performance of the conventional SC FDE technique is poor in the low altitude wireless channel due to multipath time delay and Doppler frequency shift. The transmission characteristics of the channel have been analyzed based on the aviation channel modeling, and the channel models are established according to various scenarios. In order to achieve better transmission performance in the low altitude wireless channel, an improved SC FDE technique is proposed based on the Turbo code and OSS theory. Simulation results show that the proposed technique adapts to the characteristics of the low altitude wireless channel and achieves low BER under low SNR condition. It improves the transmission performance of the communication system as well.
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