Results 121 to 130 of about 163,354 (244)

Results of 1987 MSS helicopter propagation experiment at UHF and L band in Central Maryland [PDF]

This effort emphasizes several important results pertaining to a mobile satellite system propagation experiment performed in Central Maryland during June 1987.
Goldhirsh, Julius, Vogel, Wolfhard J.
core   +1 more source

Comparison of MIMO channels from multipath parameter extraction and direct channel measurements [PDF]

, 2004
This work presents a MIMO throughput performance analysis of dynamic wideband double-directional channel measurements that were recently obtained by the University of Bristol. Identical 16-element uniform circular arrays (UCAs) were employed at both ends
Beach, MA, Pal, A, Tan, CM
core  

Elevation Angle Estimation in a Multipath Environment Using MIMO-OFDM Signals

Remote Sensing
It is challenging to estimate the elevation angle of low-altitude targets due to the multipath effect. Various signal processing techniques have been proposed to mitigate these effects, including the use of multi-frequency signals as opposed to single ...
Yeo-Sun Yoon
doaj   +1 more source

Slow Frequency-Hopping Multicarrier DS-CDMA for Transmission over Nakagami Multipath Fading Channels

, 2001
A novel multiple access scheme based on slow frequency hopping multicarrier direct-sequence code division multiple access (SFH/MC DS-CDMA) is proposed and investigated, which can be rendered compatible with the existing second-generation narrowband CDMA ...
Hanzo, L., Yang, L-L.
core  

Vertically Moving Target Localization Based on Interference Feature Matching Using a Single Hydrophone

Journal of Marine Science and Engineering
To address the performance degradation of traditional underwater target localization algorithms in high-speed motion scenarios, this paper proposes a vertically moving localization method based on interference feature matching using a single hydrophone ...
Chunpeng Zhao, Guolong Liang, Longhao Qiu, Jinjin Wang, Wenfeng Dong   +4 more
doaj   +1 more source

Analysis of Multi-GNSS Multipath for Parameter-Unified Autocorrelation-Based Mitigation and the Impact of Constellation Shifts

Remote Sensing
Multipath effects can significantly reduce the accuracy of GNSS precise positioning. Traditional methods, such as sidereal filtering and grid-based approaches, attempt to model and mitigate these errors by leveraging the spatial autocorrelation of ...
Wenhao Xiong, Yumiao Tian, Xiaolei Dai, Qichao Zhang, Yibing Liang, Xiongwei Ruan   +5 more
doaj   +1 more source

Assessing the Quality of GNSS Observations for Permanent Stations in Mexico (2020–2023)

Geomatics
A quality assessment of Global Navigation Satellite System (GNSS) observations was conducted for 95 Continuously Operating Reference Stations (CORSs) across Mexico over the period 2020–2023 using the ANUBIS software package.
Rosendo Romero-Andrade, Karan Nayak, Rafaela Mirasol Llanes-Hernández, Norberto Alcántar-Elizondo, Tiojari Dagoberto Guzmán-Galindo, Yedid Guadalupe Zambrano-Medina   +5 more
doaj   +1 more source

Ghost Removal from Forward-Scan Sonar Views near the Sea Surface for Image Enhancement and 3-D Object Modeling

Remote Sensing
Underwater sonar is the primary remote sensing and imaging modality within turbid environments with poor visibility. The two-dimensional (2-D) images of a target near the air–sea interface (or resting on a hard seabed), acquired by forward-scan sonar ...
Yuhan Liu, Shahriar Negahdaripour
doaj   +1 more source

Secure and Efficient Multicast Content Distribution

IEEE Access
This paper proposes a multicast content distribution method over quantum key distribution (QKD) networks that improves delivery latency and resilience to link bandwidth limitations through mesh network design, while also contributing to reduced key ...
Masahide Sasaki, Kazuhisa Matsuzono, Masaru Fukushima, Mikio Fujiwara   +3 more
doaj   +1 more source

A Statistical Model for Indoor Multipath Propagation

IEEE J. Sel. Areas Commun., 1987
A. Saleh, R. Valenzuela
semanticscholar   +1 more source