共查询到20条相似文献,搜索用时 15 毫秒
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该文提出了一种基于天线阵列的预处理判决反馈最小二乘恒模盲多用户检测算法,称为P-DFB-LSCMA算法。它是对天线阵列接收信号经预处理,采用判决反馈最小二乘恒模算法进行多用户检测。仿真结果表明,P-DFB-LSCMA算法比仅采用判决反馈最小二乘恒模算法(DFB-LSCMA)和传统的LSCMA算法性能要好,特别在低信噪比下性能仍优于后二者。 相似文献
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改进的GPS抗干扰自适应天线阵性能研究 总被引:2,自引:1,他引:1
文章提出了一种用于GPS接收机的新型抗干扰自适应天线阵,并给出了对其方向图和输出信干噪比的仿真过程.比较了在相同的信号环境时,该天线阵与常用的均匀直线阵、等间隔圆形阵的性能.结果表明,使用该自适应阵可以改善天线阵的方向图,提高输出信号干扰噪声比SINR,增强接收机的抗干扰能力. 相似文献
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部分并行软干扰消除迭代多用户检测算法研究 总被引:1,自引:1,他引:0
本文提出了一种基于部分并行干扰消除(PPIC)结构的迭代多用户检测算法,并对基于PPIC的迭代多用户检测器的迭代结构进行了改进.由于PPIC多用户检测器前一级输出的信息的准确度会影响到后一级的检测,所以为了提高基于PPIC的迭代多用户检测器的性能,对PPIC每一级的输出信息结合最大后验概率(MAP)信道译码器单独进行迭代处理,这样就提高了PPIC每一级输出的信息的准确性.该迭代结构可用于其他基于PIC型的迭代多用户检测算法. 相似文献
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基于恒模算法的天线阵多载波码分多址系统空频盲多用户检测 总被引:1,自引:0,他引:1
多载波码分多址(MC-CDMA)可以对抗频率选择性,天线阵可以提高系统的性能.本文首先提出一种基于恒模算法的天线阵MC-CDMA系统空频盲自适应多用户检测,该算法具有MN维权向量,结构相对复杂;进而提出一种空频联合约束恒模算法的盲自适应多用户检测,可以保证算法具有鲁棒性,收敛于期望用户,该算法具有M N权向量,结构简单.仿真表明,本文提出的算法比传统的基于波束成形的两步算法具有更好的误码率性能. 相似文献
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根据宽带码分多址( WCDMA) 系统的特点,提出并分析了一种导频符号辅助干扰删除多用户检测器(PSAIC),分析结果表明,该方法充分利用了WCDMA系统中的帧结构,在不增加物理信道的情况下,实现接收信号的相干解调,并与多址干扰删除器相连,可以大大提高系统的性能,增加系统的容量,当干扰删除器的级数为2 时,其性能有较大的改善,复杂度也不高 相似文献
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在码分多址通信系统中,由于许多用户占用同一信道进行通信,传统的单用户检测策略和最佳的多用户检测策略不是很实用。本文对直接序列-码分多址系统的多用户检测策略和次最优检测策略进行了分析和阐述,讨论了一种改进的多级并行干扰抵消接收策略,最后给出了几种模拟结果。 相似文献
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Parallel interference cancellation (PIC) based channel parameter estimators for frequency selective fading channels are proposed for the uplink in code-division multiple-access (CDMA) mobile communication systems. The performance of PIC based algorithms depends heavily on the quality of the multiple-access interference estimates, which can be improved by using adaptive channel estimation filters. The performance of two adaptive complex channel coefficient estimation filters has been verified in a fading channel by computer simulations. According to the results, the PIC based adaptive channel estimators outperform clearly conventional, successive interference cancellation, and decorrelation based adaptive channel estimators. The PIC method is also used in delay tracking. By using the principles of sample-correlate-choose-largest (SCCL) delay trackers, a robust algorithm for multiuser delay tracking in fading channels is obtained. 相似文献
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Fonollosa Javier R. Zvonar Zoran Fonollosa José A.R. Català Joan 《Wireless Personal Communications》1998,6(1-2):179-196
Cochannel interference is usually a major limitation to the performance of mobile wireless systems. Examples of different forms of cochannel interference include multi-access interference in CDMA systems and cochannel interference resulting from frequency reuse in TDMA systems. In order to mitigate the interference from other users we present a blind multiuser receiver which utilizes array observations and performs both spatial and temporal processing of the received signal. The presented technique is completely blind in the sense that no signature sequences, channel state or spatial location needs to be known a priori, nor use of a training sequences, channel state or spatial location needs to be known a priori, nor use of a training sequence is required for the adaptation. The diversity introduced by the array observations can be efficiently combined with the use of CDMA signature sequences. After initial convergence, a reliable estimate of the combined temporal and spatial signature for each user is provided that can be employed by a multiuser receiver of lower complexity. 相似文献
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在DS/CDMA系统中,采用多用户检测技术可以有效地克服多址干扰(MAI,MultipleaccessInterference)及远近效应。本文提出了一种自适应部分干扰抵消(APPIC,AdaptivePartialParallelInterferencecancellation)算法,根据匹配滤波器输出的判决统计对多址干扰进行选通抵消,以提高系统性能。同时本文给出了自适应部分干扰抵消接收机的非相干实现方案,并给出了仿真结果。 相似文献
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介绍了一种基于码片交织、重叠剪切(OC)法FDE以及频域中多用户干扰抵消的接收机结构,将接收数据变换到频域,在频域中进行联合均衡和干扰抵消,在保证较好接收效果的前提下,使系统整体运算量大大减小. 相似文献
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该文研究可变扩频长度(Variable Spreading Length, VSL) 多速率直接序列码分多址(Direct-Sequence Code-Division Multiple-Access, DS-CDMA) 系统中的自适应多用户接收机。利用到相交子空间的迭代投影估计得到包含信道信息的特征矢量,以此构造多用户接收机。借助于子空间跟踪算法的特殊形式,推导了特征矢量估计算法及多用户接收机的一种低复杂度的自适应实现。仿真实验证明,该算法有很好的数值稳定性,与传统算法BER性能相同的情况下,具有更低的计算复杂度。 相似文献
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In this paper, in order to reduce the computational complexity of the detector of vertical Bell Laboratories layered space-time
(V-BLAST) system over time-varying channels, an adaptive detection scheme is proposed based on parallel interference cancellation
(PIC). The presented scheme has three units, which are primary adaptive detector, detection ordering determiner, and adaptive
PIC detector. The proposed scheme can employ many of known adaptive algorithms for detection of V-BLAST system. In this paper,
we present computational complexity of the proposed scheme using LMS, RLS, APA and AMSER adaptive algorithms and evaluate
its performance with numerical simulations.
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