Results 261 to 270 of about 186,581 (309)
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Light detection in a 'blind' mammal
Nature Neuroscience, 1998There has been considerable debate whether the opsin genes of several 'blind' animals code for functional photopigments, and if so, what physiological responses these photopigments may mediate1. We report the first isolation and in vitro expression of a functional cone-like photopigment from the highly degenerate eye of a visually blind fossorial ...
David-Gray, Z.K. +4 more
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Novelty detection in blind steganalysis
Proceedings of the 10th ACM workshop on Multimedia and security, 2008It is generally believed that a blind steganalyzer trained on sufficiently many diverse steganographic algorithms will become universal in the sense that it will generalize to previously unseen (novel) stego methods. While this is a partially correct statement if the embedding mechanism of the novel method resembles some of the methods on which the ...
Tomás Pevný, Jessica J. Fridrich
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Blind adaptive multiuser detection
IEEE Transactions on Information Theory, 1995This paper introduces an adaptive multiuser detector which converges (for any initialization) to the minimum mean-square error detector without requiring training sequences. This blind multiuser detector requires no more knowledge than does the conventional single-user receiver: the desired user's signature waveform and its timing.
Michael L. Honig +2 more
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Blind adaptive multiuser detection
GLOBECOM '05. IEEE Global Telecommunications Conference, 2005., 2005We propose a new blind multiuser signal model and detection framework for solving the near-far problem in synchronous CDMA in this paper. Compared with existing blind detectors, the proposed framework requires a minimum number of previously received signals, which is about the number of interfering users, and no sub-space separation or sequence ...
Shu Wang +7 more
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Blind and group-blind multiuser detection in colored noise
WCNC. 1999 IEEE Wireless Communications and Networking Conference (Cat. No.99TH8466), 2003The problem of adaptive suppression of both multiple-access interference (MAI) and intersymbol interference (ISI) in a dispersive CDMA channel is considered. A subspace-based group-blind technique for this purpose is developed, which blindly suppresses the interfering signals from other cells, while jointly detects the signals within the cell of ...
Xiaodong Wang 0001, Anders Høst-Madsen
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Blind multiuser detection: a subspace approach
IEEE Transactions on Information Theory, 1998Summary: A new multiuser detection scheme based on signal subspace estimation is proposed. It is shown that under this scheme, both the decorrelating detector and the linear minimum mean-square-error (MMSE) detector can be obtained blindly, i.e., they can be estimated from the received signal with the prior knowledge of only the signature waveform and ...
Xiaodong Wang 0001, H. Vincent Poor
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Adaptive transmitter optimization for blind and group-blind multiuser detection
IEEE Transactions on Signal Processing, 2003The linear subspace-based blind and group-blind multiuser detectors recently developed represent a robust and efficient adaptive multiuser detection technique for code-division multiple-access (CDMA) systems. In this paper, we consider adaptive transmitter optimization strategies for CDMA systems operating in fading multipath environments in which ...
Daryl Reynolds, Xiaodong Wang 0001
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Asymptotic Analysis of Blind Multiuser Detection with Blind Channel Estimation
IEEE Transactions on Signal Processing, 2004The analytical performance of the subspace-based blind linear minimum mean-square error (MMSE) multiuser detection algorithm in general multipath multi-antenna code-division multiple-access (CDMA) systems is investigated. In blind multiuser detection, the linear MMSE detector of a given user is estimated from the received signals, based on the ...
Anders Høst-Madsen +2 more
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Auditory gap detection in the early blind
Hearing Research, 2006For blind individuals, audition provides critical information for interacting with the environment. Individuals blinded early in life (EB) typically show enhanced auditory abilities relative to sighted controls as measured by tasks requiring complex discrimination, attention and memory.
Kurt E, Weaver, Alexander A, Stevens
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Nonlinear group-blind multiuser detection
IEEE Transactions on Communications, 2001Summary: A nonlinear group-blind technique is developed for joint detection of some given users' data in a CDMA uplink environment with the presence of unknown interference. This method performs the so-called ``slowest-descent search'' over a likelihood function of the desired users, starting from the estimate closest to the unconstrained maximizer of ...
Predrag Spasojevic +2 more
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