| 大多普勒下基于FFT伪码捕获技术研究 |
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| 引用本文： | 班华福,王世练,朱江.大多普勒下基于FFT伪码捕获技术研究[J].通信技术,2011,44(8):36-38,126. |
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| 作者姓名： | 班华福 王世练 朱江 |
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| 作者单位： | 1. 国防科技大学电子科学与工程学院,湖南长沙410073;武警广西总队通信站,广西南宁530022
2. 国防科技大学电子科学与工程学院,湖南长沙,410073 |
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| 摘 要： | 在直接序列扩频通信中,伪码的捕获一般是通过相关运算来实现的,对于具有大多普勒频移的直接序列扩频信号,采用传统的伪码捕获方法,捕获时间将会很长,同时运算量也非常大。为了实现伪码的快速捕获,研究了一种基于FFT的伪码并行捕获算法。针对伪码长度不是2的整数次幂和存在数据跳变的问题,提出一种改善方法。计算机仿真结果表明：该方法既能满足FFT快速运算的要求又能消除数据跳变的影响,从而提高了基于FFT的伪码并行捕获性能。
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| 关 键 词： | 大多普勒频移 并行捕获 数据跳变 |
PN Code Acquisition based on FFT with Large Doppler |
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| BAN Hua-fu,WANG Shi-lian,ZHU Jiang.PN Code Acquisition based on FFT with Large Doppler[J].Communications Technology,2011,44(8):36-38,126. |
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| Authors: | BAN Hua-fu WANG Shi-lian ZHU Jiang |
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| Affiliation: | ①(①School of Electronic Science and Engineering,National Univ.of Defense Technology,Changsha Hunan 410073,China; ②Communication Station,Guangxi Armed Police Force,Nanning Guangxi 530022,China) |
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| Abstract: | In the direct sequence spread-spectrum(DSSS) communication,the acquisition of PN code is commonly implemented by correlation operation of PN code.For a DSSS signal with large Doppler offset,the traditional PN code acquisition method would require a fairly long time and large-quantity computation.For the fast PN code acquisition,a parallel acquisition algorithm based on FFT is studied.For the length of PN code is not an integer power of 2 and the presence of data transition.A method for improvement is propos... |
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| Keywords: | large Doppler-offset parallel-acquisition data transition |
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