Results 241 to 250 of about 123,433 (286)
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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.
Xu, Changjiang +2 more
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Modulus-Type Inner Outer Iteration Methods for Nonnegative Constrained Least Squares Problems
SIAM Journal on Matrix Analysis and Applications, 2016Summary: For the solution of large sparse nonnegative constrained linear least squares (NNLS) problems, a new iterative method is proposed which uses the CGLS method for the inner iterations and the modulus iterative method for the outer iterations to solve the linear complementarity problem resulting from the Karush-Kuhn-Tucker conditions of the NNLS ...
Zheng, Ning, Hayami, Ken, Yin, Jun-Feng
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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.
Dong, Jun-Liang +3 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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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 Constrained Least Square Constant Modulus Algorithm
2009 Third International Symposium on Intelligent Information Technology Application, 2009In practical problems, the constrained least square constant modulus algorithm (LSCMA) can suffer significant performance degradation in the presence of the slight mismatches between the actual and presumed array responses to the desired signal. In this paper, a novel robust constrained LSCMA is proposed based on explicit modeling of uncertainties in ...
Xin Song, Jinkuan Wang, Bin Wang
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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,
A, Samani, J, Bishop, D B, Plewes
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Power-constrained constant modulus algorithm for synchronous CDMA
Ninth IEEE Signal Processing Workshop on Statistical Signal and Array Processing (Cat. No.98TH8381), 2002An adaptive algorithm based on the power-constrained constant modulus algorithm (PC-CMA) is proposed for the the detection of synchronous CDMA signals without knowing the spreading codes. The domain of attraction (DOA) for each user is completely characterized for the orthogonal and the general two-dimensional cases.
M. Gu, L. Tong
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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 +4 more
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Robust Constrained Constant Modulus Algorithm
2012In practical applications, the performance of the linearly constrained constant modulus algorithm (CMA) is known to degrade severely in the presence of even slight signal steering vector mismatches. To account for the mismatches, a novel robust CMA algorithm based on double constraints is proposed via the oblique projection of signal steering vector ...
Xin Song +3 more
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