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The cognitive radio (CR) have been proposed to improve spectral efficiency and to meet growing demands for higher data rates in mobile communications and satellite communications. In this paper, we propose a blind estimation algorithm for a secondary user to estimate transmission parameters of the primary signal in an OFDM overlay system, using only the available fast Fourier transform (FFT) component...
This paper considers estimating the trajectory of a moving source on Earth using time difference of arrival (TDOA) and frequency difference of arrival (FDOA) measurements obtained over time at multiple satellites. The known satellite locations are subject to random errors. To cope with the source maneuver and/or temporal variations of the satellite location errors, a moving horizon estimation (MHE)-based...
Identifying the location of a target is a fundamental application in multistatic sonar. Numerous attempts have been made to improve the accuracy, computational efficiency and robustness of target positioning. Previous studies mostly use time delay and angle measurements for localization, or time delays and Doppler shifts if relative motions exist among the transmitters, target and receivers. This...
Matrix factorization is a key component of collaborative filtering-based recommendation systems because it allows us to complete sparse user-by-item ratings matrices under a low-rank assumption that encodes the belief that similar users give similar ratings and that similar items garner similar ratings. This paradigm has had immeasurable practical success, but it is not the complete story for understanding...
Reliability has emerged as an important design criterion due to shrinking device dimensions. Several reliability estimation techniques have been proposed which apply either fault injection or analytical methods. Among all such techniques, design diversity, which is initially proposed to protect system from common-mode failures using redundant copies of different implementation, has been applied to...
This paper presents a new time-frequency (TF) underdetermined blind source separation approach based on Wigner-Ville distribution (WVD) and Khatri-Rao product to separate non-stationary sources from mixtures. First, an improved method is proposed for estimating the mixing matrix, where the negative value of the auto WVD of the sources is fully considered. Then after extracting all the auto-term...
Expert finding is the task of identifying persons with expertise on a given topic. Existing methods try to model the dependencies between candidates and terms with distance measure or sequential measure, which have been proven to be effective. However, to the best of our knowledge, no work has been conducted on the combination of the two dependencies. In this paper, we propose a language model based...
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