| 多径CDMA信道中一种改进的MMSE空时多用户检测算法 |
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| 引用本文： | 梅绍彬,刘志文,徐友根. 多径CDMA信道中一种改进的MMSE空时多用户检测算法[J]. 北京理工大学学报, 2003, 23(3): 350-353 |
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| 作者姓名： | 梅绍彬 刘志文 徐友根 |
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| 作者单位： | 北京理工大学,信息科学技术学院电子工程系,北京,100081;北京理工大学,信息科学技术学院电子工程系,北京,100081;北京理工大学,信息科学技术学院电子工程系,北京,100081 |
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| 基金项目： | 国家自然科学基金;60272025; |
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| 摘 要： | 分析在多径CDMA信道中空时多用户检测的信道模型,从理论上推导出信道脉冲响应矩阵必须满足的条件．重新定义多个用户的均方误差,利用最陡下降方法求解空时多用户检测的最优权因子,并通过估计迭代表达式中的相关系数,提出一种在多径CDMA信道下低复杂度的空日寸多用户检测算法．该算法不需要求解矩阵的逆,只需求解复杂度较低的迭代系数,与经典的线性最小均方误差(MMSE)算法相比,显著降低了计算复杂度．仿真结果表明,该算法具有稳定的收敛性和良好的检测性能．
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| 关 键 词： | 阵列天线 空时多用户检测 波达方向 最小均方误差 |
| 文章编号： | 1001-0645(2003)03-0350-04 |
| 收稿时间： | 2002-08-27 |
| 修稿时间： | 2002-08-27 |
Improved MMSE Space-Time Multiuser Detection Algorithm in Multipath CDMA Channels |
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| MEI Shao bin,LIU Zhi wen and XU You gen. Improved MMSE Space-Time Multiuser Detection Algorithm in Multipath CDMA Channels[J]. Journal of Beijing Institute of Technology(Natural Science Edition), 2003, 23(3): 350-353 |
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| Authors: | MEI Shao bin LIU Zhi wen XU You gen |
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| Affiliation: | Department of Electronic Engineering, School of Information Science and Technology, Beijing Institute of Technology, Beijing100081, China;Department of Electronic Engineering, School of Information Science and Technology, Beijing Institute of Technology, Beijing100081, China;Department of Electronic Engineering, School of Information Science and Technology, Beijing Institute of Technology, Beijing100081, China |
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| Abstract: | Analysing the channel model of space time multiuser detection in multipath CDMA channels, this paper confirms to the condition of channel impulse response matrix. The users' mean square error is defined in a new form,and the optimal factor is achieved by using a steepest descent algorithm. Estimating the related parameter of iterative formula, this paper presents a less complex space time multiuser detection algorithm in multipath CDMA channels. The algorithm does not require to solve for the matrix's inverse, save for a much less complex iterative parameter. The new algorithm reduces the complexity remarkably compared with the classical linear MMSE algorithm. Simulation results illustrate that the new algorithm can offer stable convergence and good detection performance. |
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| Keywords: | array antenna space-time multiuser detection direction of arrival minimum mean square error |
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