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应用科学学报 ›› 2006, Vol. 24 ›› Issue (4): 433-436.

• 研究简报 • 上一篇    下一篇

天线相关性对空时频移键控(ST-FSK)系统性能的影响

蒋慧娟1, 谭笑2, 沈越泓1   

  1. 1. 解放军理工大学通信工程学院, 江苏南京 210007;
    2. 解放军理工大学63 研究所, 江苏南京 210007
  • 收稿日期:2005-05-10 修回日期:2005-09-06 出版日期:2006-07-31 发布日期:2006-07-31
  • 作者简介:蒋慧娟,博士生,研究方向:软件无线电,E-mail:littlejhj@163.com;沈越泓,教授,博导,研究方向:数字通信、软件无线电,E-mail:chunfeng22259@126.com

Effect of Antenna Correlation on ST-FSK System Performance

JIANG Hui-juan1, TAN Xiao2, SHEN Yue-hong1   

  1. 1. Institute of Communication Engineering, PLA University of Science and Technology, Nanjing 210007, China;
    2. Research Institute No. 63, PLA University of Science and Technology, Nanjing 210007, China
  • Received:2005-05-10 Revised:2005-09-06 Online:2006-07-31 Published:2006-07-31

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摘要： 给出了在已知天线相关因子条件下接收端的非相干ML判决度量,讨论了天线存在相关性时进制数、天线相关因子、信噪比和可靠性指标的关系.理论分析和仿真结果都表明:发射天线相关性的存在相当于破坏了发射信号的酉特性,迫使系统付出额外的“功率”代价.相应的“功率”代价随着相关因子的增加而非线性增加,而与进制数的关系很小.

关键词: 天线相关性, 非相干最大似然检测, 空时频移键控

Abstract: Space-time frequency keying (ST-FSK) can be merged naturally into frequency-hopping communication systems.Based on a previous study, this paper presents an incoherent ML decision metric in the receiver with knowledge of transmitter antenna correlation, and discusses the relationship between correlation factor, SNR, and reliability index for binary ST-FSK and quaternary ST-FSK in the presence of antenna correlation.The theoretical analysis employs random variable decomposition.Simulation results show that the presence of transmitting antenna correlation, which is equivalent to destruction of unitary characteristics, imposes extra power cost on the performance of ST-FSK systems.The corresponding power cost increases nonlinearly with correlation factor, but makes little difference for binary ST-FSK and quaternary ST-FSK.

Key words: incoherent maximum likelihood (ML) detector, antenna correlation, space-time frequency-shift keying

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