The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this contribution, a cyclic-TDOA methodology is simulated. The simulation is a preliminary study that would allow to design and to implement an indoor optical-positioning system relaxing the synchronization requirements among receivers. The synchronism requirement relaxations are carried out by the modification of the structure of the positioning system considering an emitter beacon formed with...
In a network-on-chip (NoC) based system, the NoC is a shared resource among multiple processor cores. Network requests generated by different applications running on different cores can interfere with each other, leading to a slowdown in performance of each application. The degree of slowdown introduced by this interference varies for each application, as it depends on (1) the sensitivity of the application...
In amplify-and forward (AF) cooperative systems, accurate channel state information (CSI) for both the cascaded and individual links is essential for coherent combining to achieve spatial diversity. The combined superimposed training strategy(TM+ST) is proposed, where the time-multiplexed (TM) training scheme is employed at source node (SN) to estimate the cascaded channel(S-R-D) while relay-assisted...
The minimum variance distortionless response (MVDR) beamformer is known to be sensitive to steering vector error, especially when the desired signal is present in the training snapshots. The robust capon beamformer (RCB) can deal with this problem, but is computational expensive. A modification of RCB is presented utilizing the low-rank property of the steering matrix which consists of the steering...
We proposed a new method for timing estimation in cognitive radio systems under a fractional bandwidth (FBW) scenario. A conventional timing estimation based on autocorrelation suffering performance reduction caused by interference and multipath channel distortion. The proposed method is developed based on normalized 4-th order moment for symmetric correlator. Based on these 4-th order moment, a binary...
In this paper, we consider bandwidth efficient design and channel estimation over time-varying frequency-selective environments, where the basis expansion model (BEM) is used to describe the time-varying channel. Superimposed training based channel estimation based affine precoding model is designed, where the data interference is eliminated from received data prior to performing channel estimation,...
Many multiple narrow-band source detection and DOA methods have been proposed. In the past, we have used an Approximate Maximum-Likelihood (AML) method needing considerable computational complexity for the detection and 3D DOA estimation of multiple broad-band sources. Now, we propose a novel eigen system-based array detection and DOA estimation of multiple broad-band sources with significantly reduced...
In this paper a vehicle self-localization approach in an urban traffic intersection scenario is proposed. A sensor data fusion of azimuth angle of arrival (AOA) and estimated distance measurements with speed and heading information using an Extended Kalman Filter (EKF) is carried out to track the vehicle location. Furthermore, a concept for cooperative localization (CL) is introduced based on device-to-device...
A new robust adaptive beamforming based on phase extraction is proposed in this paper. The steering vector (SV) is firstly estimated by iterative procedure, and then the angle sector of the desired signal can be determined by using the phase information of the estimated SV. By using the estimated angle sector, the interference-plus-noise covariance matrix can be calculated by Capon spectral integration...
Estimation of potential accuracy of the measurement of informative signal parameters on background of non-Gaussian additive noise was obtained. Engineering estimations of the informative signal parameters on the background of additive non-Gaussian noise, with correlated nature were found.
Impulse-radio wireless sensor network is a recently proposed concept of a wireless sensor network that aims sensing with high spatial resolution. Extremely simple architecture of the network is expected to largely reduce power consumption and maintenance cost, which enables installing huge number of sensors to observation area. Here, we propose a novel localization method for the impulse-radio wireless...
A source localization based on sparse spectral fitting and spatial matrix filtering is proposed in this paper to localize the multiple targets which are closely spaced in the strong interference environment. Comparing with the traditional methods, the properties of interference suppression and high resolution of localization are verified by simulation and experimental results.
Filter bank multi-carrier with offset QAM(FBMC/OQAM) is a multi-carrier modulation technique that can be an alternative to conventional orthogonal frequency division multiplexing(OFDM) with cyclic prefix (CP) in wireless network. FBMC has a higher spectrum efficiency and effective emission power without CP. Because the orthogonality only exists in real domain, the channel estimation in FBMC/OQAM system...
Crawling Wave Sonoelastography (CWS) provides quantitative information of tissue stiffness by the application of two mechanical vibrations into the tissue. However, most of the shear wave speed (SWS) estimators for CWS report lateral artifacts that could undermine the detection accuracy of lesion by increasing the false-positive rate. In previous works, a low-cost estimator (WAVE) based on the crawling...
Underlay cognitive networks should follow strict interference thresholds to operate in parallel with primary networks. This constraint limits their transmission power and eventually the coverage area. Therefore, in this paper, we first design a new approach for asynchronous narrow-band interference (NBI) estimation and mitigation in orthogonal frequency-division multiplexing cognitive radio networks...
In cognitive radio networks, the location information of the primary receiver is critical for underlay spectrum sharing. However, positioning the primary receiver in frequency division duplex (FDD) systems is very challenging. In this paper, we propose a novel method to position the primary receiver using the full-duplex amplified-and-forward (AF) relay technique. Simulation results indicate that...
Fixed, portable and mobile terminals use Random Access (RA) to transfer data or request more spectrally efficient dedicated resources. This paper describes a new multiple access scheme, A- SCMA, that operates with unsynchronized transmission and low power, making it particularly suitable to small machine-to-machine communications in satellite or terrestrial applications. A multicarrier version operates...
We develop a framework to estimate the Quality of Transmission (QoT) of unestablished lightpaths considering interference effects. Accurate estimations combined with lightpath provisioning close to current network state can yield significant savings in regenerators.
Heart rate (HR) monitoring is necessary for daily healthcare. Wrist-type photoplethsmography (PPG) is a convenient and non-invasive technique for HR monitoring. However, motion artifacts (MA) caused by subjects' movements can extremely interfere the results of HR monitoring. In this paper, we propose a high accuracy method using motion decision, singular spectrum analysis (SSA) and spectral peak searching...
In order to remove desired signal component from the sample covariance matrix, a novel robust adaptive beamformer is proposed based on desired signal covariance matrix estimation. The desired signal direction is first calculated based on the first-order Taylor series approximation, and then the desired signal's steering vector and power are estimated by using iterative robust minimum variance beamforming,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.