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检索条件"主题词=constant modulus algorithm"

共 249 条记录，以下是181-190 订阅

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Invasive Weed Optimization Method Based Blind Multiuser Detection for MC-CDMA Interference Suppression over Multipath Fading Channel

Invasive Weed Optimization Method Based Blind Multiuser Dete...

引用

IEEE International Conference on Systems, Man and Cybernetics

作者： Hung, Ho-Lung Chao, Chien-Chi Cheng, Chia-Hsin Huang, Yung-Fa Department of Electrical Engineering Chien-Kuo Technology University Changhua County Taiwan Department of Electrical Engineering National Formosa University Yunlin County Taiwan Department of Information and Communication Engineering Chaoyang University of Technology Township Taichung County Taiwan

ISBN: (纸本)9781424465880

The paper presents a novel constrained constant modulus (CMA) approach for the blind suppression of multiuser interference in multi-carrier code division multiple access (MC-CDMA) systems. In this paper, we put forward a novel receiver, which combines CMA blind adaptive multiuser detection with Invasive weed optimization (IWO) for MC-CDMA interference suppression over multipath fading channel. To work around potentially computational intractability, the proposed scheme exploits heuristics in consideration of both global and local exploration the step size of the CMA. The computer simulation results show that compared with the various CMA developed previously, the proposed IWO method obtains the most desirable bit error rate performance with low computational complexity.

关键词： Invasive weed optimization constant modulus algorithm Blind Multiuser Detection Multi-carrier Code Division Multiple Access component formatting

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Performance Evaluation of Multi-beam Massive MIMO Using Multi-level Modulation 21

Performance Evaluation of Multi-beam Massive MIMO Using Mult...

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21st International Symposium on Antennas and Propagation (ISAP)

作者： Taniguchi, Ryotaro Nishimori, Kentaro Kameyama, Kohei Makino, Hideo Niigata Univ Grad Sch Sci & Technol Nishi Ku Ikarashi 2 Nocho 8050 Niigata 9502181 Japan

ISBN: (纸本)9784885523137

Massive MIMO transmission has been attracted much attention as one of key technologies in next-generation mobile communication system, because it enables improvement in service area and interference mitigation by simple signal processing. Multi-beam massive MIMO configuration has proposed that utilizes the beam selection with high power in analog part and blind algorithm such as constant modulus algorithm (CMA) which does not need channel sate information (CSI) is applied in digital part. In this paper, in order to achieve the further higher transmission rate, the amplitude and phase compensation scheme is proposed when using the CMA with amplitude and phase modulation scheme.

关键词： Massive MIMO Multi-beam constant modulus algorithm quadrature amplitude and phase modulation

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Decision Feedback Blind Equalization algorithm Based on Equal Gain Combining Time Diversity

Decision Feedback Blind Equalization Algorithm Based on Equa...

引用

2nd International Symposium on Test Automation and Instrumentation

作者： Guo Yecai He Long-qing Zhu Jie Anhui Univ Sci & Technol Huainan 232001 Peoples R China

Inter-Symbol Interference (ISI), caused by the multi-path and fading channels at the receiver, affects communication quality seriously. In order to improve the communication system performance and to decrease Bit Error Rate(BER), modified constant modulus algorithm and Decision Feedback blind Equalization based on Equal Gain Combining time diversity is proposed in order to analyse the performances of time diversity and decision feedback equalizer. The proposed algorithm employs the time diversity for reducing the effect of fading channel on communication quality and utilizes decision feedback equalizer to eliminate ISI, uses Modified constant modulus algorithm (MCMA) to overcome phase rotations. Accordingly, the proposed algorithm has faster convergence speed and smaller mean square error, and its validity is verified by computer simulation with multi-path underwater acoustic channel.

关键词： Decision feedback blind equalization equal gain combining time diversity constant modulus algorithm multi-path underwater acoustic channel

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A Variable Step Size Technique for CMA Blind Equalization in Filter Bank Based Multicarrier Systems

A Variable Step Size Technique for CMA Blind Equalization in...

引用

International Conference on Control Communication and Computing (ICCC)

作者： Gopan, Neethu Radha Sheeba, V. S. Govt Engg Coll ECE Dept Trichur Kerala India

ISBN: (纸本)9781479905751;9781479905737

The filter bank based multicarrier modulation (FBMC) is a transmission technique better suited for new concepts such as dynamic access spectrum management (DASM) and cognitive radio. Filter bank-based transmultiplexer systems have certain advantages compared with existing OFDM/DFT-based multicarrier systems and they are promising candidates for high rate data transmission. However, efficient channel equalization techniques for such systems are still an active area of development. In this paper we first implement the FBMC system using cosine-modulated filter banks and the prototype filter for this system is designed using the Kaiser window approach. Then, we perform blind equalization using constant modulus algorithm (CMA). However, due to fixed step size, CMA suffers from a trade off between convergence rate and steady-state error. The choice of step size for updating the tap weights is very critical for CMA. Hence we introduce enhanced variable step size CMA (VSS-CMA) which utilizes a nonlinear function of the remainder error to control the step size. Simulation results show that the proposed algorithm provides better performance in terms of error convergence and bit error rate than the existing method.

关键词： Variable Step Size non linear function remainder error constant modulus algorithm Blind Equalization Cosine Modulated Filter Banks

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On blind adaptive decision feedback equalization for block QAM signals

On blind adaptive decision feedback equalization for block Q...

引用

41st Annual Conference on Information Sciences and Systems (CISS 2007)

作者： Cole-Rhodes, Arlene Beasley, Antoinette Morgan State Univ Baltimore MD 21251 USA

ISBN: (纸本)9781424410361

A two phase decision feedback equalizer (DFE) has been proposed for block QAM signals. This equalizer operates initially in blind mode, and then switches to a decision feedback mode once the error level in the equalizer output is determined to be low enough for successful equalization. In this work an automatic condition for switching between these two modes is introduced, which is based on a threshold test of a simple easily computed measure called the' block average variance'. The blind CMA+AMA equalizer [3] is used to initialize the DFE scheme, and performance evaluation results are presented for a random channel. Performance is evaluated using average symbol error rate (SER). Application of this equalizer to the case of a SIMO channel is discussed.

关键词： blind equalizers constant modulus algorithm DFE block QAM transmission SIMO channel

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IMPROVED algorithm FOR BLIND CHANNEL EQUALIZATION

IMPROVED ALGORITHM FOR BLIND CHANNEL EQUALIZATION

引用

10th IEEE International Computer Conference on Wavelet Active Media Technology and Information Processing (ICCWAMTIP)

作者： Tang, Pan-Shi Li, Jian-Ping Yang, Fan Univ Elect Sci & Technol China Sch Comp Sci & Engn Chengdu 611731 Peoples R China

ISBN: (纸本)9781479924455;9781479924448

This paper describes the blind channel equalization for constant modulus algorithm mathematical model and principle. Focusing on the CMA blind equalization slow convergence and convergence error, the paper analyzes and simulates recent years constant modulus algorithm and improved algorithm based on residual error and leak CMA nonlinear transformation algorithm. The results show that, compared with the constant modulus algorithm improved algorithm can improve the convergence speed.

关键词： constant modulus algorithm blind equalization leakage CMA algorithm

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The CMA adaptive array for CDMA cellular communication systems 2

The CMA adaptive array for CDMA cellular communication syste...

引用

2nd Asia-Pacific Conference on Environmental Electromagnetics (CEEM 2000)

作者： Zhou, ZM Qi, LF Huazhong Univ Sci & Technol Dept Elect & Informat Engn Wuhan 430074 Peoples R China

The use of a CMA adaptive antenna array at the base-station site to suppress interference and increase the user capacity of a CDMA cellular system is proposed. The improvement in performance is quantified by compariso... 详细信息

ISBN: (纸本)7563504206

关键词： Cellular radio Radiofrequency interference Adaptive antenna arrays Code division multiple access Antenna theory Interference suppression constant modulus algorithm CMA adaptive antenna array base-station interference suppression CDMA cellular communication systems user capacity improvement performance improvement omnidirectional antenna system

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New Concurrent Fractionally-Spaced Blind Equalization

New Concurrent Fractionally-Spaced Blind Equalization

引用

International Conference on Advanced Measurement and Test (AMT 2010)

作者： Rao, Wei Guo, Ye-cai Chen, Min Tan, Wen-qun Liu, Jian-bing Xia, Fei Fan, Li Xu, Hui-jun Nanchang Inst Technol Nanchang Peoples R China Nanjing Univ Informat Sci & Technol Nanjing Jiangsu Peoples R China Chinaunicom Jiangxi Branch Nanchang Jiangxi Peoples R China

ISBN: (纸本)9780878492695

The paper proposes a concurrent constant modulus algorithm (CMA) and decision-directed (DD) scheme for fractionally-spaced blind equalization. The proposed algorithm makes full use of the advantages of CMA and DD algorithm. A novel rule to control the adjustment of DD's tap weights vector is proposed which avoids the hard switch between CMA and DD in practice. Simulations with underwater acoustic channels are used to compare the proposed algorithm with the famous CMA. And the simulation results show that the proposed algorithm has faster convergence rate and lower steady state mean square error.

关键词： Concurrent deconvolution fractionally-spaced equalization constant modulus algorithm decision-directed algorithm underwater acoustic communication

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Design of Polynomial Function based Blind Equalizer using Particle Swarm Optimization 6

Design of Polynomial Function based Blind Equalizer using Pa...

引用

6th International Conference on Wireless Communications, Signal Processing and Networking (IEEE WiSPNET)

作者： Pydi, Sunil Kumar Majumder, Saikat Natl Inst Technol Dept Elect & Commun Raipur Madhya Pradesh India

ISBN: (纸本)9781665440868

In this paper, we propose a new particle swarm optimization (PSO) based training algorithm for the blind adaptive equalizer which uses polynomial cost function. The proposed blind equalizer with polynomial cost function trained with PSO (BEPC-PSO) is different from the conventional algorithm of constant modulus which is based on the modulus of symbols and is unable to recover the carrier phase. In contrast, BEPC-PSO can achieve automatic carrier phase recovery along with significantly improved performance. Simulations are performed to evaluate the performance of the BEPC-PSO on the finite impulse response (FIR) voice band channel. Compared with the other blind equalizers the BEPC-PSO produces a better convergence rate and a much lower inter-symbol interference (ISI) is achieved, resulting in a significant increase in the efficiency of equalization

关键词： Blind equalizer Polynomial cost constant modulus algorithm Particle swarm optimization Carrier phase recovery

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A Comparative Performance Analysis of Blind Equalization algorithms in Single Carrier Visible Light Communications 43

A Comparative Performance Analysis of Blind Equalization Alg...

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43rd International Conference on Telecommunications and Signal Processing (TSP)

作者： Yasar, Sabiha Sinop, Hayriye Tek, Yusuf Islam Tuna, Elif Busra Karaerik, Kudret Avci, Busra Aykiri, Gazihan Ozen, Ali Nub Naci Yazgan Univ HARGEM Dept Elect & Elect Engn Kayseri Turkey

ISBN: (纸本)9781728163765

It is very important to estimate and equalize the multipath optical channel blindly in visible light communication (VLC) systems. It is recommended that it is used constant modulus algorithm (CMA), modified CMA (M-CMA) and normalized CMA (N-CMA) algorithms, which are among the most commonly used blind equalization algorithms to eliminate inter-symbol interference (ISI) caused by a multipath optical channel in a closed environment in this paper. Computer simulations and comparative performance analysis of the algorithms mentioned above are performed over the Mean Square Error (MSE) and ISI performance metrics in stationary and non-stationary environment. It is observed that the best performances are obtained with M-CMA algorithm in MSE comparisons and the best performances are obtained with N-CMA algorithm in ISI comparisons from the computer simulation results.

关键词： visible light communications multipath optical channel blind equalization constant modulus algorithm channel tracking

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