Results 91 to 100 of about 12,726 (203)

Controlling AoA Estimation Errors in Rician Fading via Measurement Quality Classification

IEEE Access
Angle of Arrival (AoA) estimation plays a crucial role in modern positioning systems but is often affected by errors in multipath channels. Existing methods typically lack a direct mechanism to assess the quality of the estimates, while full channel ...
Pedro Lemos, Glauber Brante, Ohara Kerusauskas Rayel, Richard Demo Souza   +3 more
doaj   +1 more source

Angle of Arrival Estimation Using Cholesky Decomposition

International Journal of Antennas and Propagation, 2012
An angle of arrival (AOA) estimator is presented. Many applications require accurate AOA estimates such as wireless positioning and signal enhancement using space-processing techniques. The proposed AOA estimator depends on the Cholesky decomposition of
Saleh O. Al-Jazzar
doaj   +1 more source

A Fuzzy-Based Angle-of-Arrival Estimation System (AES) Using Radiation Pattern Reconfigurable (RPR) Antenna and Modified Gaussian Membership Function

IEEE Access, 2019
Angle-of-arrival (AOA) estimation is an important factor in various wireless sensing applications, especially localization systems. This paper proposes a new type of AOA estimation sensor node, known as AOA-estimation system (AES) where the received ...
Mohd Ilman Jais, Thennarasan Sabapathy, Muzammil Jusoh, R. Badlishah Ahmad, Mohd Haizal Jamaluddin, Muhammad Ramlee Kamarudin, Phaklen Ehkan, L. Murukesan Loganathan, Ping Jack Soh   +8 more
doaj   +1 more source

Reducing Bias for Closed‐Form TDOA Localization in Unified Near‐Field and Far‐Field Model

IET Signal Processing, Volume 2026, Issue 1, 2026.
Bias is a fundamental metric for evaluating the average error of an estimator, where lower bias indicates an estimator closer to the true value. Recent studies on time difference of arrival (TDOA) localization have introduced the modified polar representation (MPR) to unify near‐field and far‐field scenarios, enhancing robustness to the source range ...
Zhongwen Chen, Xinlei Wang, Yimao Sun, Beichuan Tang, Benjian Hao, Yanbing Yang, Liangyin Chen, Li Chai   +7 more
wiley   +1 more source

ns-3 Implementation of the 3GPP MIMO Channel Model for Frequency Spectrum above 6 GHz

, 2017
Communications at mmWave frequencies will be a key enabler of the next generation of cellular networks, due to the multi-Gbps rate that can be achieved.
Mezzavilla, Marco, Polese, Michele, Rangan, Sundeep, Zhang, Menglei, Zorzi, Michele   +4 more
core   +1 more source

Interannual Variability in Greenhouse Gas Emissions Challenges Post‐Restoration Net Sink Predictions in California Delta Wetlands

Global Change Biology, Volume 32, Issue 1, January 2026.
44 site‐years of eddy covariance measurements over restored California Delta wetlands show strong interannual variability in CO2 and CH4 fluxes. Vegetation establishment and water management drive whether sites act as greenhouse gas sources or sinks, challenging predictions of post‐restoration climate benefits. ABSTRACT Globally, wetlands can sequester
Kuno Kasak, Arman Ahmadi, Iryna Dronova, Ariane Arias‐Ortiz, Tianxin Wang, Alex C. Valach, Daphne Szutu, Joseph Verfaillie, Dennis D. Baldocchi   +8 more
wiley   +1 more source

Anomalous Radio-Wave Scattering from Interstellar Plasma Structures

, 2000
This paper considers scattering screens that have arbitrary spatial variations of scattering strength transverse to the line of sight, including screens that are spatially well confined, such as disks and filaments.
Ananthakrishnan S., Anantharamaiah K. R., Hankins T. H., J. M. Cordes, Kahn F., Kassim N. E., Krichbaum T. P., Lyne A. G., Marcaide J. M., T. Joseph W. Lazio, Wilkinson P. N., Williamson I. P., Williamson I. P., Williamson I. P.   +13 more
core   +1 more source

Beamspace Aware Adaptive Channel Estimation for Single-Carrier Time-varying Massive MIMO Channels

, 2017
In this paper, the problem of sequential beam construction and adaptive channel estimation based on reduced rank (RR) Kalman filtering for frequency-selective massive multiple-input multiple-output (MIMO) systems employing single-carrier (SC) in time ...
Ayanoglu, Ender, Guvensen, Gokhan M.
core   +1 more source

A Joint Decoherence-Based AOA and TDOA Positioning Approach for Interference Monitoring in Global Navigation Satellite System

Applied Sciences
Global navigation satellite system (GNSS) has been widely used in many fields due to their low cost and high positioning accuracy. Because of the open frequency of navigation signals, the low power of navigation signals, and the growing reliance of many ...
Wenjian Wang, Yinghong Wen, Yongxia Liu
doaj   +1 more source

Cooperative and Distributed Localization for Wireless Sensor Networks in Multipath Environments

, 2011
We consider the problem of sensor localization in a wireless network in a multipath environment, where time and angle of arrival information are available at each sensor.
Leng, Mei, Quek, Tony Q. S., Tay, Wee Peng   +2 more
core   +1 more source