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检索条件"主题词=Constant modulus algorithm"

共 249 条记录，以下是211-220 订阅

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Space-Time Blind Equalization Under α-Stable Noise Environment

Space-Time Blind Equalization Under α-Stable Noise Environm...

引用

5th International Conference on Wireless Communications, Networking and Mobile Computing

作者： Li Sen Dalian Maritime Univ Coll Informat Sci Technol Dalian Peoples R China

ISBN: (纸本)9781424436927

The presence of non-Gaussian impulsive noise in wireless system can degrade the performance of existing equalizers and signal detectors. In this paper, the problem of blind source separation and equalization for Multiple Input/Multiple Output systems in heavy-tailed impulsive noise is studied. A generalized multi-user constant modulus cost function by employing the fractional lower-order constant modulus proper", of the equalizer input signals as well as the fractional lower-order cross-correlations between them is proposed. The associated adaptive blind equalization algorithm based on a stochastic gradient descent method is defined as fractional lower-order multi-user constant modulus algorithm (FLOS_MU_CMA). Computer simulations are presented to illustrate the performance of the new algorithm.

关键词： alpha-stable distribution constant modulus algorithm fractional lower-order statistics MIMO equalization

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Blind Equalization for Single Carrier Frequency Domain Equalization with Low Complexity

Blind Equalization for Single Carrier Frequency Domain Equal...

引用

China-Japan Joint Microwave Conference

作者： Wang, Xin Nanjing Univ Posts & Telecommun Coll Telecommun & Informat Engn Nanjing Peoples R China

ISBN: (纸本)9781424438211

A novel approach of blind constant modulus algorithm (CMA) for single carrier frequency domain equalization is proposed to solve the application of CMA implemented in frequency domain, based on the constant modulus property from frequency domain to time domain. It is illustrated that this method has lower complexity than time-domain subspace algorithm has in broad wireless systems. And compared with the frequency-domain algorithm in (5), the complexity of the new idea is greatly reduced as well. In this research, the transformation of constant modulus algorithm from time domain to frequency domain is obtained under the assumption that the source signal amplitude remains 1. Therefore, the validity of equation (8) results in the conclusion that the performance of symbol error of the method would not be influenced by the transformation from time domain to frequency domain. Simulation results demonstrate it.

关键词： Single carrier frequency domain equalization constant modulus algorithm complexity discrete Fourier transform

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MIMO Equalization of 16-QAM Signal Blocks using an FFT-based Alphabet-Matched CMA 51

MIMO Equalization of 16-QAM Signal Blocks using an FFT-based...

引用

51st Annual Conference on Information Sciences and Systems (CISS)

作者： Taiwo, Peter O. Cole-Rhodes, Arlene Morgan State Univ Elect & Comp Engn Dept Baltimore MD 21251 USA

ISBN: (纸本)9781509047802

In this work we investigate the blind equalization of signal blocks of data, which have been transmitted over a multiple-input/multiple-output channel using 16-QAM modulation. We apply the Fast Fourier Transform (FFT) in order to improve the efficiency of the blind equalizer update. Our equalizer is based on a cost function, which is specified as the sum of the constant modulus algorithm (CMA) and the alphabet-matched algorithm (AMA). The equalization is done using a block processing multistage approach as was introduced in [3], but with an FFT implementation. In this work, a 3-input/7-output MIMO communication system is considered, and the performance of the MIMO equalizer is analyzed using Monte Carlo simulations. Performance is measured based on the average symbol error rate (SER) and the total number of equalized cases. In addition, initial comparative results are provided for a fixed number of transmit antennas, but with varying numbers of receive antennas.

关键词： Blind equalization constant modulus algorithm Alphabet matched algorithm FFT Channel estimation MIMO Communication system

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Joint channel estimation and decoding of space-time block codes

Joint channel estimation and decoding of space-time block co...

引用

56th IEEE Vehicular Technology Conference

作者： Xu, CJ Le-Ngoc, T McGill Univ Dept ECE Montreal PQ H3A 2A7 Canada

ISBN: (纸本)0780374673

The channel estimation of space-time (ST) block coding transmission using the constant modulus algorithm (CMA) is investigated. The ST block coding transmission is represented by an orthogonal vector-channel model. Based on this orthogonal model, a general expression of linear decoding decision rules for ST block codes and the sufficient and necessary conditions for convergence of the CMA are derived. It is shown that the CMA directly converges to a vector-channel under the orthogonal condition. A channel estimation method using the convergence value of the CMA is proposed for ST block coding transmission systems and is suitable for 1-D signaling or 2-D signaling using a square constellation. Illustrative results show that the proposed scheme provides a better accuracy than the cross-correlated method.

关键词： transmit diversity space-time block coding channel estimation constant modulus algorithm wireless communication

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Orthogonal Wavelet Transform Based Sign Decision Dual-mode Blind Equalization algorithm

Orthogonal Wavelet Transform Based Sign Decision Dual-mode B...

引用

9th International Conference on Signal Processing

作者： Guo, Ye-cai Han, Ying-ge Yang, Chao Nanjing Univ Informat Sci & Technol Nanjing 210044 Peoples R China Anhui Univ Sci & Technol Huainan 232001 Peoples R China

ISBN: (纸本)9781424421787

Aiming at the slow convergence rate and the high mean square error of constant modulus algorithm(CMA), a new orthogonal Wavelet Transform based Sign Decision Dual-mode blind equalization algorithm(WT-SDDA) is proposed. In the proposed algorithm, orthogonal Wavelet Transform based constant modulus algorithm (WT-CMA) is integrated with orthogonal Wavelet Transform based Stop-and-Go Changeable modulus blind equalization algorithm (WT-SG-CMA), and the switch process is decided by the sign decision. Simulation tests with underwater acoustic channel shows that the proposed WT-SDDA algorithm outperforms the CMA and the WT-CMA in the convergence rates and residual mean square error and that it has the faster convergence rate than the WT-SG-CMA under condition of the same residual error.

关键词： constant modulus algorithm wavelet transform dual-mode under-water acoustic channel convergence rate

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Multi-modulus algorithms using hyperbolic and givens rotations for blind deconvolution of MIMO systems 40

Multi-Modulus algorithms using hyperbolic and givens rotatio...

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40th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2015

作者： Shah, Syed Awais W. Abed-Meraim, Karim Al-Naffouri, Tareq Y. Saudi Arabia Polytech'Orleans PRISME Laboratory 12 Rue de Blois Orleans France Saudi Arabia

ISBN: (纸本)9781467369978

The issue of blind Multiple-Input and Multiple-Output (MIMO) deconvolution of communication system is addressed. Two new iterative Blind Source Separation (BSS) algorithms are presented, based on the minimization of Multi-modulus (MM) criterion. A pre-whitening filter is utilized to transform the problem into finding a unitary beamformer matrix. Then, applying iterative Givens and Hyperbolic rotations results in Givens Multi-modulus algorithm (G-MMA) and Hyperbolic G-MMA (HG-MMA), respectively. Proposed algorithms are compared with several BSS algorithms in terms of Signal to Interference and Noise Ratio (SINR) and Symbol Error Rate (SER) and it was shown to outperform them. © 2015 IEEE.

关键词： blind source separation constant modulus algorithm Givens and Hyperbolic rotations multi-modulus algorithm

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Improvement in dynamic equalization performance of a coherent receiver by CMA gain adaptation

Improvement in dynamic equalization performance of a coheren...

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2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference, IMOC 2011

作者： Ribeiro, V.B. Diniz, J.C.M. Rosa, E.S. Juriollo, A.A. De Oliveira, J.C.R.F. Bordonalli, A.C. Reconfigurable Optical Systems Laboratory - LASOR CPqD Campinas Brazil Microwave and Optics Department University of Campinas Campinas Brazil

ISBN: (纸本)9781457716621

The constant modulus algorithm has a relatively slow convergence speed in digital coherent receivers when compared to other algorithms, such as the least mean square. This paper proposes and experimentally demonstrates a simple gain adaptation method that improves the convergence of the dynamic equalizer in an 112 Gb/s PM-QPSK transmission receiver. © 2011 IEEE.

关键词： 100G coherent systems Convergence Heuristic algorithms Optical noise Q factor Receivers Signal processing algorithms Signal to noise ratio constant modulus algorithm gain adaptation

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The beamforming for an adaptive antenna system in multi-vehicles TT&C environment

The beamforming for an adaptive antenna system in multi-vehi...

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6th International Conference on Signal Processing

作者： Feng, WJ Zhong, YC Zhao, F Yang, SZ Chongqing Univ Chongqing 400044 Peoples R China

ISBN: (纸本)0780374886

In multi-vehicles environment, TT&C systems is realized through unified spread spectrum framework. Adaptive antenna digital beamforming technologies are used to track, measure and command objects. constant modulus array (CMA) and adaptive signal canceller estimate the direction of arrival (DOA) of every signal and use the optimum weighted vector to form the beams. The phase-weighted vectors estimated from DOA improve the processing gain as well as being utilized in the transmitting of tele-command signal to form the beam of specified object. Its processing performance is researched and simulated in this paper.

关键词： TT&C digital beamforming constant modulus algorithm

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A Novel QAM Technique for High Order QAM Signaling

A Novel QAM Technique for High Order QAM Signaling

引用

作者： Ozen, A. Brno University of Technology

The paper proposes a novel spread quadrature amplitude modulation (S-QAM) technique with high SNR improvement for high-order QAM channels. Simulated and experimental bit error rate (BER) performance analyses of the proposed technique in blind and non-blind equalizers are obtained by using single carrier (SC) WiMAX (IEEE 802.16-2004) radio. Instead of using any one particular type of channel profile, this study concentrates on true frequency selective Rayleigh fading channels in the real-time WiMAX radio environment around 3.5 GHz. The constant modulus algorithm (CMA) blind equalizer has been compared with the popular non-blind equalizers, Recursive Least Squares (RLS) and Least Mean Squares (LMS) algorithm, as benchmarks. It has been proven in experimental and simulated channels that CMA blind equalizer, using the proposed technique, can be considered as a low complexity, spectrum efficient and high performance time domain equalizations to be embedded in a transceiver for the next generation communications. Furthermore the proposed technique has also reduced approximately till 5 dB and 7.5 dB performance differences between non-blind and blind equalizers for 16-QAM and 64-QAM, respectively. The simulation results have demonstrated that the simulated and experimental studies of the proposed technique are compatible with each other and extremely satisfying.

关键词： Experimental BER adaptive blind training WiMAX (IEEE 802.16-2004) constant modulus algorithm S-QAM

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Performance Improvement of QPSK Signal Predetection EGC Diversity Receiver

Performance Improvement of QPSK Signal Predetection EGC Dive...

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作者： Nikolic, B. Brno University of Technology

This paper proposes a modification of quadrature phase-shift-keying (QPSK) signal diversity reception with predetection equal gain combiner (EGC). The EGC combining is realized by using the constant modulus algorithm (CMA). Carrier synchronization is performed by the phase locked loop (PLL). Comparative analysis of the modified and ordinary diversity receiver in the presence of carrier frequency offset in the additive white Gaussian noise (AWGN) channel, as well as in Rician fading channel is shown. The proposed diversity receiver allows significant frequency offset compared to the diversity receiver that uses only PLL, and the error probability of the proposed receiver is very close to the error probability of the receiver with only PLL and zero frequency offset. The functionality of the proposed diversity receiver, as well as its properties is experimentally verified on a system based on universal software radio peripheral (USRP) hardware. The performed comparison confirms the expected behavior of the system.

关键词： Equal gain combiner constant modulus algorithm phase locked loop adaptive filtering

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