Results 211 to 220 of about 18,960 (263)
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A modified constrained constant modulus approach to blind adaptive multiuser detection
IEEE Transactions on Communications, 2001Summary: An alternative blind adaptive multiuser detection is investigated based on a modified constrained constant modulus (CM) criterion. It has been shown that the performance of a CM-based receiver is limited by the received power of the desired user.
Changjiang Xu +2 more
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Adaptive Constrained Constant Modulus Algorithm Based on Auxiliary Vector Filtering for Beamforming
IEEE Transactions on Signal Processing, 2010A constrained constant modulus (CCM) algorithm with the auxiliary vector filtering (AVF) technique is introduced for robust adaptive beamforming. The proposed scheme decomposes the adaptive filter into constrained (reference vector filters) and unconstrained (auxiliary vector filters) components. The weight vector is iterated by subtracting the scaling
Rodrigo C De Lamare
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Modulus Methods for Nonnegatively Constrained Image Restoration
SIAM Journal on Imaging Sciences, 2016Summary: In image restoration problems, it is reasonable to add nonnegative constraints because of the physical meaning of images. In general, this problem can be expressed as a quadratic programming problem with nonnegative constraints, which results in a linear complementary problem from the Karush-Kuhn-Tucker optimization conditions.
Jun-Liang Dong +3 more
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A constrained modulus reconstruction technique for breast cancer assessment
IEEE Transactions on Medical Imaging, 2001A reconstruction technique for breast tissue elasticity modulus is described. This technique assumes that the geometry of normal and suspicious tissues is available from a contrast-enhanced magnetic resonance image. Furthermore, it is assumed that the modulus is constant throughout each tissue volume. The technique, which uses quasi-static strain data,
Abbas Samani +2 more
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On the Design of Multi-Spectrally Constrained Constant Modulus Radar Signals
IEEE Transactions on Signal Processing, 2020This paper deals with the synthesis of constant modulus waveforms that optimize radar performance while satisfying multiple spectral compatibility constraints. For each shared band, a precise control is imposed on the injected interference energy. Furthermore, the compliance with amplifiers operating in saturation is ensured at the design stage where ...
Aubry A. +3 more
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A Subspace Constrained Constant Modulus Algorithm for Blind Array
2005 IEEE International Symposium on Circuits and Systems, 2005It is known that the stochastic gradient descent (SGD)-based constant modulus algorithm (CMA) has the drawback of slow convergence rate. It is also known that under some weak conditions, all local minima of CMA are identical to that of a CMA which is constrained in signal subspace.
Y. X. Chen +2 more
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A modulus iteration method for non-negatively constrained TV image restoration
Computers & Mathematics with Applications, 2023zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Jianjun Zhang, Xi Zhang
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Constrained constant modulus algorithm in multiuser detection
Fifth Asia-Pacific Conference on ... and Fourth Optoelectronics and Communications Conference on Communications,, 1999A novel blind adaptive algorithm, constrained constant modulus algorithm (C-CMA) for multiuser detection is proposed in the paper. We analyze the convergence behavior of C-CMA in the noiseless case, from which an approximate relation between the constant in C-CMA and the power of the desired user, which guarantees the algorithm converges to the desired
null Wang Yi +2 more
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Robust algorithm for linearly constrained constant modulus
2010 International Conference On Computer Design and Applications, 2010Linearly constrained constant modulus algorithm (CMA) is an effective blind adaptive beamforming. However, the constrained CMA suffers from severe performance degradation even if there is a small mismatch in the desired signal. In this paper, we propose a new approach to linearly constrained CMA that provides increased robustness against the mismatch ...
null Xin Song +3 more
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Iterative Constrained Least Squares for Robust Constant Modulus Beamforming
IEEE Transactions on Aerospace and Electronic Systems, 2017This paper addresses robust beamforming in the presence of model uncertainty for constant modulus (CM) signals that are frequently encountered in radar and communication systems. Instead of employing the commonly used minimum variance approach, we utilize a CM criterion that is different from the conventional techniques for blind equalization.
Xue Jiang 0001 +4 more
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