| 基于Fast-ICA同、异步系统短码CDMA信号扩频序列与信息序列盲估计 |
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| 引用本文： | 任啸天,徐晖,黄知涛,陆凤波.基于Fast-ICA同、异步系统短码CDMA信号扩频序列与信息序列盲估计[J].电子学报,2011,39(12):2726-2732. |
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| 作者姓名： | 任啸天 徐晖 黄知涛 陆凤波 |
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| 作者单位： | 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： | 本文通过分析短码CDMA信号特性,将接收信号以间隔2倍扩频周期、重叠1倍扩频周期的时间窗进行分割,建模CDMA系统与线性混合的盲源分离模型一致,使建立的CDMA模型同时适用于同、异步系统.利用盲源分离方法,实现了同步系统、异步系统失步时间未知和已知条件下,各用户等功率或非等功率时,扩频序列与信息序列的盲估计.理论分析和...
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| 关 键 词： | 短码扩频码分多址 扩频序列盲估计 信息序列盲估计 盲源分量 独立分量分析 |
| 收稿时间： | 2011-01-21 |
Fast-ICA Based Blind Estimation of Spreading and Information Sequences of Short-Code CDMA Signals in Synchronous and Asynchronous Systems |
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| REN Xiao-tian,XU Hui,HUANG Zhi-tao,LU Feng-bo.Fast-ICA Based Blind Estimation of Spreading and Information Sequences of Short-Code CDMA Signals in Synchronous and Asynchronous Systems[J].Acta Electronica Sinica,2011,39(12):2726-2732. |
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| Authors: | REN Xiao-tian XU Hui HUANG Zhi-tao LU Feng-bo |
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| Affiliation: | School of Electronic Science and Engineering,National University of Defense Technology,Changsha,Hunan 410073,China |
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| Abstract: | The characteristic of the Code Division Multiple Access (CDMA) signal is analyzed in this paper.And the CDMA system is modeled as the blind source separation pattern,with the received signal is divided into two-spreading-period-length temporal vectors overlapped by one spreading period.The model is applicable for both the synchronous and asynchronous systems.In the new method,the blind source separation algorithm is used to estimate the spreading sequences and information sequences blindly in synchronous and asynchronous systems,no matter the desynchronization time is known or not,and with the users' power are equally or not.At last,mathematical analysis and simulation results demonstrate the validity of the new method. |
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| Keywords: | short-code CDMA blind estimation of the spreading sequence blind estimation of the information sequence blind source separation(BSS) independent component analysis(ICA) |
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