共查询到19条相似文献,搜索用时 78 毫秒
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一种用于CDMA系统的新型智能天线 总被引:1,自引:0,他引:1
本文提出了一种用于CDMA繁华诉新型智能天线。这种智能天线采用近似等旁瓣方向图,加权矢量无需预先预测、校正,可由累加、平均算法获得,具有良好的工程实现性。本文提出的智能天线与自适应智能天线具有相似的扩容能力,但它无需迭代、响应速度快、鲁棒性也更好。 相似文献
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作为一种发展较快的技术,智能天线技术在移动通信领域中引起了广泛关注,它能够根据所处的电磁环境,智能的调节自身参数,抑制干扰,提高天线增益,增加频谱利用率,从而改善移动通信系统的性能。介绍了智能天线的工作原理、性能和特点,讨论了在CDMA系统中采用智能天线后系统信噪比性能和容量的改善情况。 相似文献
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In this paper, we investigate array calibration algorithms to derive a further improved version for correcting antenna array errors and RF transceiver errors in CDMA smart antenna systems. The structure of a multi‐channel RF transceiver with a digital calibration apparatus and its calibration techniques are presented, where we propose a new RF receiver calibration scheme to minimize interference of the calibration signal on the user signals. The calibration signal is injected into a multichannel receiver through a calibration signal injector whose array response vector is controlled in order to have a low correlation with the antenna response vector of the receive signals. We suggest a model‐based antenna array calibration to remove the antenna array errors including mutual coupling errors or to predict the element patterns from the array manifold measured at a small number of angles. Computer simulations and experiment results are shown to verify the calibration algorithms. 相似文献
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针对阵列通道不一致性引起的幅相误差校正问题,基于多级维纳滤波器(MSWF),该文提出幅相误差快速校正的简化的多级维纳滤波器(SMSWF)算法。SMSWF算法利用校正源的方位和波形信息对阵列幅相参数进行估计,无需估计协方差矩阵和进行特征值分解,大大地减小了计算量,且具有与特征分解方法相同的幅相参数估计性能。研究发现,单个信源入射到阵列且信源波形已知时,SMSWF算法获得的信号子空间等价于特征分解法得到的信号子空间,这表明SMSWF算法能够替代特征分解法,从而极大减小基于特征分解法的信号处理方法的计算量。大量计算机仿真和消声水池试验验证了SMSWF算法的优越性能。 相似文献
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Papathanassiou Apostolos Furió Ignasi Blanz Josef Johannes Baier Paul Walter 《Wireless Personal Communications》1999,11(1):89-108
Smart antennas for base stations of cellular mobile radio systems offer the potential of system performance enhancement by taking advantage of the directionally inhomogeneous signal reception at the receiver. In this paper, two-dimensional array configurations employed at the uplink receiver of a joint detection CDMA (JD-CDMA) mobile radio system are investigated. This smart antenna concept can be split up into a novel channel estimator and data detector which incorporate explicitely the information of the direction-of-arrival (DOA) of signals emerging from users assigned to the considered base station. Proceeding from channel models that model the directional inhomogeneity of the mobile radio channel with single DOAs, the link level performance of a JD-CDMA mobile radio system using this smart antenna concept is evaluated for the rural propagation environment. The performance evaluation is based on Monte Carlo simulations of data transmission and average bit error rates versus the average signal to noise ratio per net information bit are presented for different array configurations. Although these results should be considered as upper bounds for the link level performance, they reveal the advantages of implementing two-dimensional array configurations at the uplink receiver of a JD-CDMA mobile radio system. 相似文献
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根据子空间的基本原理,提出一种新的阵列天线幅相误差校正算法,该方法利用粗略已知的校正源方位角信息进行优化,使用迭代的方法逼近幅相误差的真实值.由于不需要其他的迭代初始值,从而保证该方法能收敛到最优解.计算机仿真实验证明了该方法的有效性. 相似文献
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为满足5G 移动通信系统对信道容量的要求,提出了一种应用于5G 移动终端的双频多输入多输出(MIMO)天线系统。它由沿移动终端两个长边垂直放置的八个天线单元组成。该天线系统可以覆盖中国工业和信息化部(MIIT)所规划的3.3 ~ 3.6 GHz 和4.8 ~ 5 GHz 两个频段,且低频段和高频段的天线效率分别高于61% 和50%。通过优化各天线的相对位置和放置方向,使得各端口之间的隔离度优于15 dB。为更好评估天线系统性能,计算了MIMO天线的包络相关系数(ECC)和信道容量(CC)。所得该MIMO 天线系统在工作频段内ECC均小于0.1,且信道容量峰值可以达到36.8 bps/ Hz。同时,制作并测量了MIMO 天线样品,测试结果与仿真结果表现出良好的一致性。 相似文献