DS/FH混合扩频系统快速捕获新算法

文霄杰; 张彦仲; 邵定蓉; 李署坚

DS/FH混合扩频系统快速捕获新算法

北京航空航天大学电子信息工程学院, 北京 100191

详细信息

作者简介:
文霄杰(1983-),女,湖北天门人,博士生,wenxiaojie@ee.buaa.edu.cn.

中图分类号: TN 914.4
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- 被引次数: 0
出版历程
- 收稿日期: 2010-07-21
- 网络出版日期: 2012-12-30

Novel rapid acquisition algorithm for hybrid DS/FH spread spectrum systems

School of Electronics and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

摘要

摘要: 针对DS/FH (Direct Sequence/Frequency Hopping)混合扩频系统捕获时间长的难题,提出了一种基于可变跳频速率的捕获算法.对搜索过程中频率未对准状态进行快速出局处理,降低平均捕获时间;对准状态则通过较长时间来验证以降低虚警概率.通过状态流图,导出了新算法在高斯白噪声信道和典型干扰环境下的平均捕获时间计算公式、检测概率、漏警概率和虚警概率.仿真结果表明,在高斯白噪声环境下,选取合适的门限,平均捕获时间可减少为传统快速扫描法的1/4;在干扰环境下,新算法鲁棒性优于后者.
- DS/FH /
- 扩频通信 /
- 捕获 /
- 频率识别
Abstract: To improve the mean acquisition time performance of hybrid DS/FH spread spectrum systems, a rapid acquisition algorithm based on alterable frequency hopping rate was proposed. The unaligned states frequencies were excluded to fast decrease mean acquisition time, while the acquisition was declared after adequate verification to decrease false alarm probability. The closed form expression of the mean acquisition time was obtained with the state diagram in additive Gaussian noise channel and typical jamming environment, and the probabilities of detection, missing, and false alarm were derived. The simulation results show that, in the circumstance of additive Gaussian noise channel, the mean acquisition time with the optimal threshold is decreased almost 1/4 of the one using the tradition fast scanning method and the new algorithm is more robust under jamming.
- direct sequence/frequency hopping(DS/FH) /
- spread spectrum communication /
- acquisition /
- frequency identification

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参考文献(1)

[1] Yang Wenge,Meng Shengyun,Wang Jinbao,et al.Acquisition performance analysis of a synchronization scheme of DS/FH hybrid spread spectrum signals for TT&C //Electronic Measurement & Instruments.Beijing:IEEE Computer Society,2009:4395-4399 [2] Sourour E,Elezabi A.Robust acquisition of hybrid direct sequence-slow frequency hopping spread-spectrum under multitone and Gaussian interference in fading channels //Wireless Communications and Networking Conference.Las Vegas:IEEE,2008:917-922 [3] Vanninen T,Saarnisaari H,Raustia M,et al.FH-code phase synchronization in a wireless multi-hop FH/DSSS adhoc network //Military Communications Conference.Washington:IEEE,2006:1-7 [4] Song M,Wigginton S.Frequency hopping pattern detection in wireless ad hoc networks //Proceedings of the International Conference on Information Technology:Coding and Computing.Las Vegas:IEEE Computer Society,2005:633-638 [5] Zhao Minjian,Xu Mingxia,Zhong Jie,et al.Slot synchronization in ad hoc networks based on frequency hopping synchronization //Wireless Communications,Networking and Mobile Computing.Wuhan:IEEE Computer Society,2006:1-4 [6] Tabassam A,Heiss S.Bluetooth clock recovery and hop sequence synchronization using software defined radios //Region 5 Conference.Kansas City:IEEE Computer Society,2008:1-5 [7] Benvenuto N,Guidotti G,Pupolin S.Performance of a digital acquisition circuit for hybrid FH-DS spread spectrum systems //Military Communications Conference.San Diego:IEEE,1988:971-975 [8] 张波,邵定蓉,李署坚.DS/FH混合系统快速同步的研究[J].北京航空航天大学学报,2005,31(11):1226-1231 Zhang Bo,Shao Dingrong,Li Shujian.Study on fast synchronization of hybrid DS/FH system[J].Journal of Beijing University of Aeronautics and Astronautics,2005,31(11):1226-1231(in Chinese) [9] Holmes J K,Chen Chang C.Acquisition time performance of PN spread spectrum systems[J].IEEE Transactions on Communications,1977,25(8):778-783 [10] Polydoros A,Weber C.A unified approach to serial search spread-spectrum code acquisition—part I:general theory[J].IEEE Transactions on Communications,1984,32(5):542-549 [11] Li Hong,Lu Mingquan,Feng Zhenming.Improved zeropadding method for rapid long PN-Code acquisition[J].IEEE Transactions on Signal Processing,2008,56(8):3795-3799

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