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BLIND EQUALIZATION OF MIMO SYSTEMS BASED ON ORTHOGONAL CONSTANT MODULUS ALGORITHM 被引量:1
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作者 Shi Kun Zhang Xudong 《Journal of Electronics(China)》 2006年第2期181-183,共3页
This paper investigates adaptive blind source separation and equalization for Multiple Input Multiple Output (MIMO) systems. To effectively recover input signals, remove Inter-Symbol Interference (ISI) and suppress In... This paper investigates adaptive blind source separation and equalization for Multiple Input Multiple Output (MIMO) systems. To effectively recover input signals, remove Inter-Symbol Interference (ISI) and suppress Inter-User Interference (IUI), the array input is first transformed into the signal subspace, then with the derived orthogonality between weight vectors of different input signals, a new orthogonal Constant Modulus Algorithm (CMA) is proposed. Computer simulation results illustrate the promising performance of the proposed method. Without channel identification, the proposed method can recover all the system inputs simultaneously and can be adaptive to channel changes without prior knowledge about signals. 展开更多
关键词 Multiple Input Multiple Output (MIMO) system blind equalization constant modulus algorithm (cma ORTHOGONALITY
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Blind Equalization Algorithm Based on MCMA and DSE-CMA 被引量:2
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作者 GENG Nian XUE Ni RU Guobao 《Wuhan University Journal of Natural Sciences》 CAS 2008年第1期67-70,共4页
A new blind equalization algorithm based on the modified constant modulus algorithm (MCMA) and dithered signederror constant modulus algorithm (DSE-CMA) is proposed. This dithered signed-error MCMA (DSE-MCMA) ca... A new blind equalization algorithm based on the modified constant modulus algorithm (MCMA) and dithered signederror constant modulus algorithm (DSE-CMA) is proposed. This dithered signed-error MCMA (DSE-MCMA) can not only reduce the computational complexity, but also recover the phase rotation in the complex channel. Simulation results have verified the analysis and indicated the good property of DSE-MCMA. 展开更多
关键词 blind equalization modified constant modulus algorithm (Mcma) intersymbol interference
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Widely linear UKF constant modulus algorithm for blind adaptive beamforming
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作者 Huaming Qian Ke Liu +2 位作者 Long Li Linchen Qian Junda Ma 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2017年第3期413-423,共11页
Based on a uniform linear array, a new widely linear unscented Kalman filter-based constant modulus algorithm (WL-UKF-CMA) for blind adaptive beamforming is proposed. The new algorithm is designed according to the con... Based on a uniform linear array, a new widely linear unscented Kalman filter-based constant modulus algorithm (WL-UKF-CMA) for blind adaptive beamforming is proposed. The new algorithm is designed according to the constant modulus criterion and takes full advantage of the noncircular property of the signal of interest (SOI), significantly increasing the output signal-to interference-plus-noise ratio (SINR), enhancing the convergence speed and decreasing the steady-state misadjustment. Since it requires no known training data, the proposed algorithm saves a large amount of the available spectrum. Theoretical analysis and simulation results are presented to demonstrate its superiority over the conventional linear least mean square-based CMA (L-LMS-CMA), the conventional linear recursive least square-based CMA (L-RLS-CMA), WL-LMS-CMA, WL-RLS-CMA and L-UKF-CMA. 展开更多
关键词 widely linear filtering blind beamforming noncircular signals constant modulus algorithm unscented Kalman filtering
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ADAPTIVE STEP-SIZE CONSTANT MODULUS ALGORITHM FOR BLIND MULTIUSER DETECTION IN DS-CDMA SYSTEMS
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作者 SunLiping HuGuangrui 《Journal of Electronics(China)》 2004年第1期10-15,共6页
Blind Adaptive Step-size Constant Modulus Algorithm (AS-CMA) for multiuser detection in DS-CDMA systems is presented. It combines the CMA and the concept of variable step-size, uses a second LMS algorithm for the step... Blind Adaptive Step-size Constant Modulus Algorithm (AS-CMA) for multiuser detection in DS-CDMA systems is presented. It combines the CMA and the concept of variable step-size, uses a second LMS algorithm for the step size. It adjusts the step-size according to the minimum output-energy principle within a specified range, thus overcomes the problems of bad effect of fixed step-size LMS algorithm. Compared with Adaptive Step-size LMS (AS-LMS) algoritilrn, through simulations, this algorithm can adapt the changes of the environment, suppress multiple access interference in the dynamic environment and the stability of Signal to Interference Ratio (SIR) is superior to that of AS-LMS. 展开更多
关键词 CDMA constant modulus algorithm blind interference suppression
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Constant modulus semi-blind space-time equalizer based on structure risk minimum criterion
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作者 毛忠阳 王红星 +1 位作者 宋恒 李军 《Journal of Beijing Institute of Technology》 EI CAS 2013年第4期536-543,共8页
A new adaptive filtering principle based on capability control and semi-blind method is presented. A new semi-blind space-time equalizer based on constant modulus characteristic and structure risk minimum (SRM) crit... A new adaptive filtering principle based on capability control and semi-blind method is presented. A new semi-blind space-time equalizer based on constant modulus characteristic and structure risk minimum (SRM) criterion is also proposed. The equalizer sufficiently exploits the learning information of communication signals by using the structure information of filter itself through capability control technique. Namely, it maximizes the amount of learning information to im- prove filter tracking performance. Simulations are carried out and the result is compared with that of typical recursive least squares space-time equalizer (RLS-STE) and constant modulus semi-blind space-time equalizer ( CM-SB-STE ). The results show that, even if with insufficient training data, the SRM constant modulus semi-blind space-time equalizer (SCM-SB-STE) keeps good tracking per- formance, showing promises in mobile wireless communications. 展开更多
关键词 equalization space-time filter capability control SEMI-blind constant modulus
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WIDELY LINEAR RLS CONSTANT MODULUS ALGORITHM FOR COMPLEX-VALUED NONCIRCULAR SIGNALS 被引量:1
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作者 Zhang Ting Wang Bin Liu Shigang 《Journal of Electronics(China)》 2014年第5期416-426,共11页
Based on the constant modulus criterion, a new Widely Linear(WL) blind equalizer and a novel widely linear recursive least square constant modulus algorithm are proposed to improve the blind equalization performance f... Based on the constant modulus criterion, a new Widely Linear(WL) blind equalizer and a novel widely linear recursive least square constant modulus algorithm are proposed to improve the blind equalization performance for complex-valued noncircular signals. The new algorithm takes advantage of the WL filtering theory by taking full use of second-order statistical information of the complex-valued noncircular signals. Therefore, the weight vector contains the complete second-order information of the real and imaginary parts to decrease the residual inter-symbol interference effectively. Theoretical analysis and simulation results show that the proposed scheme can significantly improve the equalization performance for complex-valued noncircular signals compared with traditional blind equalization algorithms. 展开更多
关键词 Complex-valued noncircular signals blind equalization Widely Linear(WL) filtering constant modulus
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Joint receiving mechanism based on blind equalization with variable step size for M-QAM modulation
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作者 卢继华 Abdallah Elhirtsia AHMED +1 位作者 王晓华 Kheddar BOUDJEMAA 《Journal of Beijing Institute of Technology》 EI CAS 2015年第3期381-386,共6页
The problem of inter symbol interference( ISI) in wireless communication systems caused by multipath propagation when using high order modulation like M-Q AMis solved. Since the wireless receiver doesn't require a ... The problem of inter symbol interference( ISI) in wireless communication systems caused by multipath propagation when using high order modulation like M-Q AMis solved. Since the wireless receiver doesn't require a training sequence,a blind equalization channel is implemented in the receiver to increase the throughput of the system. To improve the performances of both the blind equalizer and the system,a joint receiving mechanismincluding variable step size( VSS) modified constant modulus algorithms( MC-MA) and modified decision directed modulus algorithms( MD DMA) is proposed to ameliorate the convergence speed and mean square error( MSE) performance and combat the phase error when using high order QAM modulation. The VSS scheme is based on the selection of step size according to the distance between the output of the equalizer and the desired output in the constellation plane. Analysis and simulations showthat the performance of the proposed VSS-MCMA-MD DMA mechanismis better than that of algorithms with a fixed step size. In addition,the MCMA-MDDMA with VSS can performthe phase recovery by itself. 展开更多
关键词 inter symbol interference(ISI) modified constant modulus algorithm(Mcma) modified decision directed modulus algorithm(MDDMA) variable step size blind equalization phase rotation
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Single-User Blind Channel Equalization Using Modified Constant Modulus Algorithm 被引量:1
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作者 孙守宇 郑君里 +1 位作者 吴里江 张琪 《Tsinghua Science and Technology》 SCIE EI CAS 2004年第1期38-44,共7页
A modified constant modulus algorithm (MCMA) for blind channel equalization is proposed by modifying the constant modulus error function. The MCMA is compared with the conventional constant modulus algorithm (CMA) for... A modified constant modulus algorithm (MCMA) for blind channel equalization is proposed by modifying the constant modulus error function. The MCMA is compared with the conventional constant modulus algorithm (CMA) for symbol-spaced equalization of 4PSK signals. The result shows that the performance of the MCMA is superior to that of the CMA in both convergence rate and intersymbol interference for frequency selective channels in noisy environments. Simulation results using 8PSK signals also demonstrate that a fractionally spaced equalizer can preserve performance over variations in symbol-timing phase, whereas a baud-rate equalizer cannot. 展开更多
关键词 blind channel equalization constant modulus algorithm (cma) modified constant modulus algorithm (Mcma) symbol spaced equalization fractionally spaced equalization (FSE)
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Blind equalization of underwater acoustic channel using a combined constant modulus algorithm
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作者 WANG Feng ZHAO Junwei LI Hongsheng (Institute of Acoustic Engineering, Northwestern Polytechnical University Xi’an 710072) 《Chinese Journal of Acoustics》 2003年第3期268-273,共6页
A kind of Combined Constant Modulus Algorithm (CCMA) is presented to compensate the defects of the Constant Modulus Algorithm (CMA) and the Sign Error CMA (SECMA). And CCMA is applied to the equalization of the underw... A kind of Combined Constant Modulus Algorithm (CCMA) is presented to compensate the defects of the Constant Modulus Algorithm (CMA) and the Sign Error CMA (SECMA). And CCMA is applied to the equalization of the underwater acoustic channel (UWAC). Based on the decision of the equalizer’s output, its iteration process switches between 展开更多
关键词 Ccma in IT of blind equalization of underwater acoustic channel using a combined constant modulus algorithm IS LENGTH SWC MSE
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Improved DSE-CMA Error Function for Blind Multiuser Interference Suppression in DS/CDMA Systems
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作者 赵海波 胡光锐 朱丽平 《Journal of Shanghai University(English Edition)》 CAS 2005年第5期429-431,共3页
This paper presents an improved error function of dithered signed-error constant modulus algorithm (IDSE-CMA) for blind multiuser interference suppression in DS/CDMA systems. It uses a different error function to re... This paper presents an improved error function of dithered signed-error constant modulus algorithm (IDSE-CMA) for blind multiuser interference suppression in DS/CDMA systems. It uses a different error function to replace the former one in sign operation of the DSE-CMA and compares their performance in multiple access interference (MAI) suppression ability. Simulations indicate that the new algorithm has better performance than the similar CMA in terms of convergence speed and steady-state performance: 展开更多
关键词 interference suppression constant modulus algorithm(cma CDMA.
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ADAPTIVE BLIND ESTIMATION ALGORITHM FOR OFDM-MIMO RADIO SYSTEMS OVER MULTIPATH CHANNELS
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作者 DuJiang PengQicong 《Journal of Electronics(China)》 2004年第6期441-448,共8页
This paper investigates the blind algorithm for channel estimation of Orthogonal Frequency Division Multiplexing-Multiple Input Multiple Output (OFDM-MIMO) wireless communication system using the subspace decompositio... This paper investigates the blind algorithm for channel estimation of Orthogonal Frequency Division Multiplexing-Multiple Input Multiple Output (OFDM-MIMO) wireless communication system using the subspace decomposition of the channel received complex baseband signals and proposes a new two-stage blind algorithm. Exploited the second-order cyclostationarity inherent in OFDM with cyclic prefix and the characteristics of the phased antenna, the practical HIPERLAN/2 standard based OFDM-MIMO simulator is established with the sufficient consideration of statistical correlations between the multiple antenna channels under wireless wideband multipath fading environment, and a new two-stage blind algorithm is formulated using rank reduced subspace channel matrix approximation and adaptive Constant Modulus (CM)criterion. Simulation results confirm the theoretical analysis and illustrate that the proposed algorithm is capable of tracking matrix channel variations with fast convergence rate and improving acceptable overall system performance over various common wireless and mobile communication links. 展开更多
关键词 Orthogonal Frequency Division Multiplexing-Multiple Input Multiple Output(OFDM-MIMO) system HIPERLAN/2 Two-stage blind algorithm constant modulus algorithm (cma) Matrix channel estimation CONVERGENCE
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基于CMA算法的双模式盲均衡算法 被引量:16
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作者 徐金标 葛建华 王育民 《通信学报》 EI CSCD 北大核心 1997年第2期65-69,共5页
常数模算法(CMA)的收敛速度非常缓慢。为了加快收敛过程,一旦误码率降低到足够低,该算法必须切换到DD算法。为了克服这些缺点,本文利用QAM信号分布在几个已知半径的圆上的特点,提出了两类多模盲均衡算法。在此基础上又提... 常数模算法(CMA)的收敛速度非常缓慢。为了加快收敛过程,一旦误码率降低到足够低,该算法必须切换到DD算法。为了克服这些缺点,本文利用QAM信号分布在几个已知半径的圆上的特点,提出了两类多模盲均衡算法。在此基础上又提出一种双模式均衡方案:多模算法模式和常数模算法模式。研究表明,两类多模算法及双模式均衡方案收敛快。 展开更多
关键词 常数模算法 双模式 盲均衡 均衡器
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基于Dual-Mode MCMA+DD双模式盲均衡算法研究 被引量:5
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作者 郭元术 岳蕾 姚博彬 《光子学报》 EI CAS CSCD 北大核心 2009年第10期2702-2706,共5页
为了兼顾误差性能和收敛速度,研究了将双模修正常量模算法和判决引导算法有机结合的双模式盲均衡算法.该算法在收敛初期采用双模修正常量模算法调整均衡器,然后根据判决条件自动切换到判决引导算法,最终实现信道的盲均衡.仿真结果表明:... 为了兼顾误差性能和收敛速度,研究了将双模修正常量模算法和判决引导算法有机结合的双模式盲均衡算法.该算法在收敛初期采用双模修正常量模算法调整均衡器,然后根据判决条件自动切换到判决引导算法,最终实现信道的盲均衡.仿真结果表明:此算法收敛速度快、稳态误差小,并能在去除码间干扰的同时纠正信道固有的相位旋转,具有很好的实用性. 展开更多
关键词 盲均衡 常量模算法 双模式盲均衡算法 修正常量模算法
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基于LCCMA的盲自适应多用户检测新算法 被引量:6
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作者 蒋笑冰 薛强 +1 位作者 王江 冯玉珉 《铁道学报》 EI CAS CSCD 北大核心 2004年第5期66-70,共5页
基于LCCMA(线性约束恒模算法)提出了一种新的盲自适应多用户检测算法。本文中提出的这种算法适用于多径衰落信道,能很好抵消多址干扰和克服多径衰落。仿真证明,这种算法的性能和基于子空间分解的多用户检测算法的性能相当,但运算复杂度... 基于LCCMA(线性约束恒模算法)提出了一种新的盲自适应多用户检测算法。本文中提出的这种算法适用于多径衰落信道,能很好抵消多址干扰和克服多径衰落。仿真证明,这种算法的性能和基于子空间分解的多用户检测算法的性能相当,但运算复杂度低于子空间算法。因此这种算法的总体性能优于基于子空间分解的多用户检测算法,是值得进一步研究的课题,并使之推广应用。 展开更多
关键词 码分多址 多用户检测 恒模算法 盲自适应
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MCMA盲均衡算法的FPGA高效实现 被引量:3
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作者 李淑婧 王蕾 +1 位作者 张东伟 张帆 《现代电子技术》 北大核心 2019年第1期9-13,18,共6页
修正恒模算法(MCMA)是一种有效的针对QPSK信号盲均衡算法。在Artix-7系列的XC7A200T-2SBG484芯片上,采用流水线结构,结合高时钟以及乘法器复用等方式,实现MCMA盲均衡算法;分析验证步长参数与算法性能的制约关系,选出最优化的步长参数。... 修正恒模算法(MCMA)是一种有效的针对QPSK信号盲均衡算法。在Artix-7系列的XC7A200T-2SBG484芯片上,采用流水线结构,结合高时钟以及乘法器复用等方式,实现MCMA盲均衡算法;分析验证步长参数与算法性能的制约关系,选出最优化的步长参数。在保证算法误码性能和收敛速度的前提下,有效降低了算法实现复杂度,使用较少的硬件资源达到了理想的均衡效果。在此基础上,应用试飞采集数据于均衡器,验证结果表明,该均衡器在占用较少硬件资源的条件下性能优良,接收端的解调信噪比降低4 dB。 展开更多
关键词 修正恒模算法 QPSK信号 高时钟 流水线结构 乘法器复用 盲均衡
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一种新的基于进化规划方法的盲CMA快速收敛算法 被引量:3
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作者 田俊霞 匡镜明 王华 《信号处理》 CSCD 北大核心 2006年第3期395-397,共3页
本文把改进的进化规划方法引进到解决均衡问题中,定义以代价函数为自变量的一种新的函数作为高斯随机化算子的标准差,来控制算法的收敛,提出了一种新的基于进化规划的CMA算法(QEPCMA),该方法应用进化规划来估计均衡器的系数,进一步提高... 本文把改进的进化规划方法引进到解决均衡问题中,定义以代价函数为自变量的一种新的函数作为高斯随机化算子的标准差,来控制算法的收敛,提出了一种新的基于进化规划的CMA算法(QEPCMA),该方法应用进化规划来估计均衡器的系数,进一步提高了文献[5]中改进的CMA算法的收敛速度。通过Monte—Carlo仿真,比较了这两种算法和标准 CMA算法的性能,验证了所提算法的有效性。 展开更多
关键词 进化规划 盲均衡 cma算法 快速收敛
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改进CMA盲均衡算法的研究与分析 被引量:5
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作者 高丽娟 赵洪利 钱磊 《装备指挥技术学院学报》 2006年第6期89-93,共5页
目前,常数模算法(constant modulus algorithm,CMA)应用非常广泛,但它存在收敛速度慢,剩余误差大的缺点。为加快收敛速度,一旦误码率降低到足够低,算法必须切换到DD(decision-directed)算法,针对其存在的缺点,提出了一种改... 目前,常数模算法(constant modulus algorithm,CMA)应用非常广泛,但它存在收敛速度慢,剩余误差大的缺点。为加快收敛速度,一旦误码率降低到足够低,算法必须切换到DD(decision-directed)算法,针对其存在的缺点,提出了一种改进的CMA算法,通过理论分析得出:该算法具有收敛速度快、剩余误差小的特点。通过利用Matlab对改进前、后2种算法的仿真,对算法的有效性进行了验证。 展开更多
关键词 盲均衡 常数模算法 剩余误差
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基于DD-LMS和MCMA的盲判决反馈均衡算法研究 被引量:5
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作者 朱行涛 赵翔 刘郁林 《微波学报》 CSCD 北大核心 2007年第2期67-70,共4页
文章对具有DFE结构的盲均衡算法作了研究,在一种修正常模算法(MCMA)代价函数中引入泄漏因子,并将常模算法(CMA)和直接判决-最小均方误差算法(DD-LMS)同时应用到盲判决反馈均衡器的抽头更新中,得到一种适用范围广?均衡特性好?变步长的DD-... 文章对具有DFE结构的盲均衡算法作了研究,在一种修正常模算法(MCMA)代价函数中引入泄漏因子,并将常模算法(CMA)和直接判决-最小均方误差算法(DD-LMS)同时应用到盲判决反馈均衡器的抽头更新中,得到一种适用范围广?均衡特性好?变步长的DD-LLMS+MCMBDFE算法。该算法在均衡的同时能自动补偿由信道引起的相位误差,收敛速度快,收敛后剩余误差小,同时还能克服当均衡器长期没有持续输入激励时,LMS算法产生的抽头系数漂移问题。仿真结果表明DD-LLMS+MCMBDFE算法是一种有效的盲判决反馈均衡算法。 展开更多
关键词 盲均衡 剩余误差 常模算法(cma) 判决反馈均衡算法(DFE) 直接判决-最小均方误差算法(DDLMS)
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多径衰落信道中一种新的基于CMA的盲多用户检测算法 被引量:2
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作者 蒋笑冰 薛强 冯玉珉 《电子与信息学报》 EI CSCD 北大核心 2003年第5期633-638,共6页
该文基于 CLSCMA算法提出了一种新的盲自适应多用户检测算法,这种算法适用于多径衰落信道。这种多用户检测算法能很好抵消多址干扰和克服多径衰落,算法的收敛性能和子空间自适应多用户检测算法相当,而稳态性能稍强于子空间多用户检测算... 该文基于 CLSCMA算法提出了一种新的盲自适应多用户检测算法,这种算法适用于多径衰落信道。这种多用户检测算法能很好抵消多址干扰和克服多径衰落,算法的收敛性能和子空间自适应多用户检测算法相当,而稳态性能稍强于子空间多用户检测算法。因而是一种优秀的盲自适应多用户检测算法,具有一定的应用和研究价值。 展开更多
关键词 多径衰落信道 cma 多用户检测算法 码分多址 恒模算法 盲自适应 CDMA
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一种新的CMA盲多用户检测算法 被引量:2
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作者 薛强 蒋笑冰 吴伟陵 《电子与信息学报》 EI CSCD 北大核心 2002年第9期1161-1166,共6页
该文提出了一种新的盲自适应多用户检测算法,这种算法的计算复杂度为O(NL),其中N为扩频因子,L为取样数据窗长度。仿真分析表明,该文提出的算法稳态性能好,收敛速度特别快,且能适应环境的变化,是一种较好的多用户检测算法。
关键词 码分多址 多用户检测 恒模算法 盲自适应 CDMA
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