| 零相关区序列在准同步系统中的应用 |
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| 作者单位： | 天津市河北工业大学信息工程学院 天津300401 |
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| 摘 要： | 在准同步码分多址(QS-CDMA)中,影响系统性能的是零延时附近的部分扩频序列相关函数,而且奇相关函数和偶相关函数发挥同等重要的作用。文中对三种零相关区(ZCZ)序列的相关函数进行分析比较,并采用BPSK调制方式,在高斯白噪声(AWGN)信道下,对采用上述三种ZCZ序列的准同步系统进行仿真。仿真结果表明,相关函数特性好的序列具有较好的准正交性,更适用于QS-CDMA系统。仿真实验还验证了系统性能与序列零相关区长度之间的关系。
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| 关 键 词： | 准同步码分多址 扩频序列 零相关区序列 |
Application of ZCZ Sequences in QS-CDMA Systems |
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| Authors: | Jia Zhicheng Li Shufeng Jiang Wenjuan Chen Lei |
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| Institution: | Jia Zhicheng Li Shufeng Jiang Wenjuan Chen Lei |
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| Abstract: | In a quasi-synchronous code division multiple access (QS-CDMA) system,the correlation functions around the origin influence the system performance and the odd functions are as important as the even functions.In this paper,three kinds of zero correlation zone (ZCZ) sequences are used,and the correlation functions are analyzed and compared.BPSK simulations in the QS-CDMA system us- ing these three kinds of QS sequences as spreading codes on the additive white Gaussian noise (AWGN) channel show that these sequences are quasi-orthogonal.So they are suitable for the QS-CDMA system.The simulation results also prove the relation between the system per- formance and the zero correlation zone of the sequence. |
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| Keywords: | QS-CDMA Spreading sequence ZCZ sequence |
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