| 基于双正交Fourier变换的多径chirp信号检测 |
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| 引用本文： | 闫超,郑霖,宁向延,仇洪冰.基于双正交Fourier变换的多径chirp信号检测[J].南京邮电大学学报(自然科学版),2014(3):52-57. |
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| 作者姓名： | 闫超 郑霖 宁向延 仇洪冰 |
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| 作者单位： | [1]桂林电子科技大学信息与通信学院,广西桂林541004 [2]通信网信息传输与分发技术重点实验室,河北石家庄050081 |
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| 基金项目： | 国家自然科学基金（61362006,61371107）、省部共建教育部重点实验室认知无线电基金（2013ZR08）、中电54所通信网信息传输与分发技术重点实验室基金（KX132600010/ITD-U13003）资助项目 |
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| 摘 要： | 多调频斜率chirp信号在双正交Fourier变换（biorthogonal Fourier transform,BFT）域内具有良好的正交性,以此特性能够显著提高chirp调制效率.文中分析了多进制chirp-rate信号的BFT检测性能,并证明BFT正交性在实际的宽带多径信道下会遭到破坏,导致检测输出同时存在码间串扰和码内互扰,通过对多径下的BFT输出信号建模,提出一种抗干扰检测算法.仿真和分析表明,BFT在检测多进制chirp-rate调制信号时具有出众的检测性能,以及在多径环境下改进算法能够有效克服其缺陷,改善了误码率性能.
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| 关 键 词： | 多进制chirp-rate调制 双正交Fourier变换 多径信道 |
Multipath Chirp Signal Detection Based on Biorthogonal Fourier Transform |
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| YAN Chao,ZHENG Lin,NING Xiang-yan,QIU Hong-bing.Multipath Chirp Signal Detection Based on Biorthogonal Fourier Transform[J].Journal of Nanjing University of Posts and Telecommunications,2014(3):52-57. |
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| Authors: | YAN Chao ZHENG Lin NING Xiang-yan QIU Hong-bing |
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| Institution: | 1.School of Information and Communication, Guilin University of Electronic Technology, Guilin 541004, China; 2.School of Information and Communication, Guilin University of Electronic Technology, Guilin 541004, China ;Science ＆ Technology on Information Transmission ＆ Dissemination in Communication Networks Lab, Shijiazhuang 050081, China;) |
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| Abstract: | The multiple-chirp-rate signal has a good orthogonal feature in biorthogonal Fourier transform （BFT） domain to improve the chirpmodulation efficiency.This paper analyzes the BFT performances of the multiple-chirp-rate signal detection,and proves that the BFT orthogonality can be damaged in the practical broadband multipath channels,which arises ISI and intra-rate interference during the BFT detection procedure.To solve this problem,an anti-interference detection algorithm is proposed by modeling the BFT outputs.Simulation and analysis results show that BFT in multiple-chirp-rate signal detection has the outstanding performance.Furthermore,the proposed algorithm can effectively reduce the interference for BFT in multipath environment. |
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| Keywords: | multiple-chirp-rate modulation biorthogonal Fourier transform（BFT） multipath channel |
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