| 核空间的LMS自适应多用户检测技术 |
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| 引用本文： | 李文元,解明辉.核空间的LMS自适应多用户检测技术[J].数据采集与处理,2012,27(2):225-150. |
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| 作者姓名： | 李文元 解明辉 |
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| 作者单位： | 1. 西安通信学院通信指挥系,西安,710106
2. 西安通信学院基础部,西安,710106 |
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| 基金项目： | 国家自然科学基金(50323005)资助项目 |
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| 摘 要： | 提出一种核空间的LMS(KLMS)多用户检测算法,将直接序列扩频码分多址(Direct-sequence code division multiple access,DS-CDMA)接收机收到的信号通过高斯核函数映射到高维特征空间(核空间),再进行线性检测.由于采用了核技巧,所有的计算都在原空间进行,避免了特征空间的复杂运算.KLMS本质是对原空间的信号进行非线性检测,性能更接近最优检测算法.在高斯信道下,仿真结果表明,通过选择合适的核参数,在获得较好稳态误差的同时,KLMS算法具有比其他变步长LMS算法更快的收敛速度.
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| 关 键 词： | 多用户检测 核空间 LMS |
| 收稿时间： | 2011/5/30 0:00:00 |
| 修稿时间： | 2011/10/24 0:00:00 |
Kernel Space-Based LMS Multi-user Detection Technology |
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| liwenyuan.Kernel Space-Based LMS Multi-user Detection Technology[J].Journal of Data Acquisition & Processing,2012,27(2):225-150. |
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| Authors: | liwenyuan |
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| Affiliation: | 1.Communications Command Department,Xi′an Communications Institute,Xi′an,710106,China;2.Basic Department,Xi′an Communications Institute,Xi′an,710106,China) |
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| Abstract: | A kernel-based LMS(KLMS) multi-user detection method is presented.The KLMS detection projects the received signal of direct-sequence code division multiple access(DS-CDMA) system to high-dimensional character space by a Gaussian kernel function,and then uses linear detection.By using the kernel technique,all calculation is in the low-dimensional space,thus avoiding complex calculation in high-dimensional space.It is a nonlinear multi-user detector for original space data.And the performance is closer to that of the optimum detector.Simulation results show that by choosing a suitable kernel parameter,KLMS can provide faster convergency with the same stable error,compared with other LMS of variable step sizes. |
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| Keywords: | multi-user detection kernel space LMS |
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