基于准恒包络正交频分复用的临近空间通信抗衰落技术  

Anti-fading technology of near space communication based on quasi-constant envelope OFDM

作　　者：陆阳 张东磊 王婷婷[2] LU Yang;ZHANG Donglei;WANG Tingting(Global Energy Interconnection Research Institute Co.,Ltd.,Beijing 102209,China;Beijing University of Posts and Telecommunications,Beijing 100876,China)

机构地区：[1]全球能源互联网研究院有限公司,北京102209 [2]北京邮电大学,北京100876

出　　处：《电信科学》2019年第1期113-120,共8页Telecommunications Science

基　　金：国家电网公司科技项目"基于高空平台(HAPS)的临近空间通信技术研究"(No.52110417001A)~~

摘　　要：针对临近空间高空平台功率受限、频谱资源紧张以及在非视距、低仰角环境下通信受多径衰落影响的问题,提出了一种基于准恒包络正交频分复用的临近空间通信抗衰落技术。在发射端,将两路正交频分复用信号分别调制在两路恒包络信号的相位上,并通过移相将两路信号合并为一路;在接收端,通过泰勒级数展开技术将两路信号分开并解调。分析与仿真结果表明,准恒包络正交频分复用具有与正交频分复用相同的频谱效率,通过合理选择调制指数,能够有效对抗多径衰落,且信号峰均功率比低于3 dB,实现了高谱效、高能效的目标。For the near space high altitude platform station (HAPS),its limited power,tight spectrum resources,and the multipath fading effects due to non line of sight (NLoS)and low elevation communication environment are the main problems.An anti-fading technology of near space communication based on quasi-constant envelope OFDM (QCE-OFDM)was proposed.At the transmitting end,two OFDM signals were respectively modulated on the phases of two constant envelope signals,and then they were merged into one signal via phase shift.At the receiving end,Taylor series expansion technology was employed to divide and demodulate the signal.Analysis and simulation resuits show that the QCE-OFDM has the same spectral efficiency as OFDM.By selecting the modulation index reasonably,the proposed scheme can combat multipath fading effectively with less than 3 dB signal peak-to-average power ratio (PAPR),where the goal of high spectral efficiency and high energy efficiency can be achieved.

关 键 词：临近空间通信 高空平台 准恒包络 正交频分复用 多径衰落 峰均功率比 

分 类 号：TN911.7[电子电信—通信与信息系统]