Zobrazeno 1 - 10
of 31
pro vyhledávání: '"Wolfhard J. Vogel"'
Publikováno v:
IEEE Transactions on Antennas and Propagation. 49:1695-1702
In wireless communications, the performance of a smart antenna system depends heavily upon vector channels describing channel propagation between an antenna array and a mobile subscriber. The smart antennas perform quite well in stationary mobile env
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6c5c971ff410666e7b4552fa23572da9
https://doi.org/10.1109/8.982448
https://doi.org/10.1109/8.982448
Publikováno v:
IEEE Transactions on Microwave Theory and Techniques. 48:930-937
In wireless communications, smart antenna systems that employ antenna arrays coupled with adaptive signal-processing techniques at the basestation improve capacity, coverage, and trunking efficiency. However, design and performance analysis of smart
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::50502b5eca242b7bcdf29f72eb57b318
https://doi.org/10.1109/22.846719
https://doi.org/10.1109/22.846719
Publikováno v:
IEEE Transactions on Antennas and Propagation. 46:953-962
A spatial signature is the response vector of a base-station antenna array to a mobile unit at a certain location. Mobile subscribers at different locations exhibit different spatial signatures. The exploitation of spatial diversity (or the differenc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3b0cb00ef995121bc0e6ba4243e7b42e
https://doi.org/10.1109/8.704796
https://doi.org/10.1109/8.704796
Autor:
R. Akturan, Wolfhard J. Vogel
Publikováno v:
IEEE Transactions on Antennas and Propagation. 45:1107-1116
A new method for analyzing the propagation aspects of mobile satellite systems is introduced. It consists of: (1) taking fisheye lens images at potential user locations; (2) extracting path state information (clear, shadowed, or blocked) as a functio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5b55b2a9096715e4db967e04ca3b1805
https://doi.org/10.1109/8.596901
https://doi.org/10.1109/8.596901
Publikováno v:
Wireless Networks. 3:299-308
In this paper, we present a system that models the land-mobile satellite communication channel with a Markov chain approach supported by images of the mobile Earth station's (MES) environment. Our method employs a video camera with a fish-eye lens ca
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::126e800d91404e1d62016b0bee357b3b
https://doi.org/10.1023/a:1019173721318
https://doi.org/10.1023/a:1019173721318
Publikováno v:
IEEE Transactions on Antennas and Propagation. 43:713-719
This paper presents results from simultaneous L- and S-band slant-path fade measurements through a pecan, a cottonwood, and a pine tree employing a tower-mounted transmitter and dual-frequency receiver. A single circularly polarized antenna was used
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9e34afd9214f2db68db02bdf369c3c2e
https://doi.org/10.1109/8.391143
https://doi.org/10.1109/8.391143
Publikováno v:
Journal of Spacecraft and Rockets. 29:123-128
Attenuation measurements were implemented at L-band (1.5 GHz) in southeastern Australia during an 11-day period in October 1988 as part of a continuing examination of the propagation effects due to roadside trees and terrain for mobile-satellite serv
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::88d27f93c2b0129060a396bc4bf9fae2
https://doi.org/10.2514/3.26323
https://doi.org/10.2514/3.26323
Publikováno v:
RAWCON 99. 1999 IEEE Radio and Wireless Conference (Cat. No.99EX292).
This paper presents measurement and modeling results of the statistical characteristics of narrowband vector channel (spatial signature) variations at different wireless scenarios in a suburban environment. The measurements were performed using a rea
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2c60d13739da6739a49a3c4a8cb45db9
https://doi.org/10.1109/rawcon.1999.810957
https://doi.org/10.1109/rawcon.1999.810957
Publikováno v:
Proceedings of ICC/SUPERCOMM '96 - International Conference on Communications.
We present a system that uses a Markov chain approach to model the communication channels using videos of the environments in land mobile satellite (LMS) personal communication systems (PCS). Our method is based on capturing fish-eye lens images of t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ab83721df4c0686b4f362a7685a096ac
https://doi.org/10.1109/icc.1996.535303
https://doi.org/10.1109/icc.1996.535303
Publikováno v:
Proceedings of Vehicular Technology Conference - VTC.
We present a system that substitutes video image processing for propagation measurements and permits flexible fade simulation of land mobile satellite communication (LMSC) systems. Our method is based on deriving environmental characteristics from fi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3f79e98c68e25b7701f3eccac0e8558a
https://doi.org/10.1109/vetec.1996.501465
https://doi.org/10.1109/vetec.1996.501465