| 直接扩频序列信号的参数估计 |
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| 引用本文： | 詹亚锋,曹志刚,马正新.直接扩频序列信号的参数估计[J].系统工程与电子技术,2004,26(9):1176-1178. |
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| 作者姓名： | 詹亚锋 曹志刚 马正新 |
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| 作者单位： | 1. 清华大学电子工程系微波与数字通信国家重点实验室,北京,100084;清华大学宇航技术研究中心,北京,100084
2. 清华大学电子工程系微波与数字通信国家重点实验室,北京,100084 |
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| 摘 要： | 在频谱监测、电子侦听等非协作通信中,接收机要对直接扩频序列信号进行侦收,必须要首先估计信号的参数,包括波特率、码片速率和载波频率等。由于噪声功率电平远高于接收到的信号功率电平,常规的基于能量和谱的参数估计方法在此并不适用。针对这些问题提出了一种估计算法,该算法首先对接收信号的自相关函数进行累积以消除噪声的影响,然后在此基础上估计信号的波特率、码片速率和载波频率。所有这些算法都不需要知道DSSS信号的具体调制类型。计算机仿真结果表明了这些算法的有效性。
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| 关 键 词： | 直接扩频序列信号 参数估计 波特率 chip率 载波频率 |
| 文章编号： | 1001-506X(2004)09-1176-03 |
| 修稿时间： | 2003年7月6日 |
Parameter estimation for direct spread spectrum sequence signals |
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| ZHAN Ya-feng,CAO Zhi-gang,MA Zheng-xin.Parameter estimation for direct spread spectrum sequence signals[J].System Engineering and Electronics,2004,26(9):1176-1178. |
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| Authors: | ZHAN Ya-feng CAO Zhi-gang MA Zheng-xin |
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| Institution: | ZHAN Ya-feng,CAO Zhi-gang,MA Zheng-xinDepartment of Electronic Engineering,Tsinghua University,Beijing 100084,China, 2. Space Center,Tsinghua University,Beijing 100084,China) |
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| Abstract: | In non-cooperative communication systems such as spectrum surveillance and electronic interception, the receiver must estimate the parameters of direct spread spectrum sequence (DSSS) signal, including baud rate, chip rate and carrier frequency for demodulation. Because the noise power is much higher than the power of the intercepted signal, the ordinary method based on the power spectrum is not available. An estimation algorithm is proposed. The algorithm eliminates the effect of noise based on the cumulation of the self-correlation functions of the received signal, then estimates the values of baud rate, chip rate and carrier frequency. In the algorithm, it is not necessary to know the modulation type. Computer simulations verify the effectiveness of the algorithm. |
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| Keywords: | direct spread spectrum sequence parameter estimation baud rate chip rate carrier frequency |
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