Temat: IEEE 802.16 - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: A hybrid-mesh solution for coverage issues in WiMAX metropolitan area networks
Autorzy:: Gierłowski, K.
Wodniak, J.
Nowicki, K.
Powiązania:: https://bibliotekanauki.pl/articles/308513.pdf
Data publikacji:: 2008
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: IEEE 802.16
WiMAX
coverage
mesh
measurements
Opis:: The new WiMAX technology offers several advantages over the currently available (GSMor UMTS-based) solutions. It is a cost effective, evolving, and robust technology providing quality of service guarantees, high reliability, wide cov- erage and non-line-of-sight (NLOS) transmission capabilities. All these features make it particularly suitable for densely populated urban environments. In this paper we discuss the design and implementation difficulties concerning network coverage discovered in a test-bed implementation of WiMAX. We point out the presence of unexpected "white spots" in the coverage, which are not inherently characteristic of the WiMAX concept. As a possible remedy to this significant drawback of the otherwise very promising technology, we consider reconfigurable mesh organization of WiMAX base stations. We also suggest directions for further development of this kind of network operation, partly based on our practical experience. Despite the clear advantages of the mesh mode in WiMAX networks, its development is currently at an early stage, due to the high complexity of the necessary mechanisms. In this situation, we propose an original, much simpler solution: the so-called support-mesh mode.
Źródło:: Journal of Telecommunications and Information Technology; 2008, 1; 20-28
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Przetargi na częstotliwości WiMAX z zakresu 3,6-3,8 GHz
Auctions for WiMAX frequencies from the range 3,6-3,8 GHz
Autorzy:: Półtorak, M.
Powiązania:: https://bibliotekanauki.pl/articles/154219.pdf
Data publikacji:: 2009
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: IEEE 802.16
Internet
ADSL
WiMAX Forum
WiBro
WiMAX forum
Opis:: Tematem referatu jest problematyka dostępu do Internetu na obszarach o słabo rozbudowanej infrastrukturze teleinformatycznej oraz zasady organizacji przetargów i przydziałów częstotliwości wykorzystywanych dla budowy bezprzewodowych sieci dostępu do Internetu WiMAX budo-wanych z wykorzystaniem częstotliwości z zakresu 3,6-3,8 GHz. Na bazie zakończonych przetargów na obszarach przetargowych 08.1 i 08.2 położo-nych na obszarze województwa lubuskiego przedstawiono etapy realizacji zobowiązań zadeklarowanych w ofertach przetargowych. Przetargi te organizowane były przez Prezesa Urzędu Komunikacji Elektronicznej.
The subject of this paper is the access to the Internet on areas where telecommunication infrastructure is poor as well as the rules of organizing auctions on assignment of frequencies from 3,6-3.8 GHz range which can be used for building wireless broadband networks based on WiMAX technology. In the latest years the term "broadband networks" describes a new generation technology of high speed data transmission [2]. Such high speed data transmission is possible by using both wire and wireless networks (Section 2.) The WiMAX wireless technology can be widely used in Poland (Subsection 2.1.). Data from the European Union show that at the beginning of the year 2008 (Fig. 1) Poland was one of the countries which had the lowest index of access to the broadband services [6]. Poland can improve this situation by using frequencies from 3,6-3,8 GHz range to build wireless broadband networks. The President of the Office of Electronic Communications (UKE) offered these frequencies on auctions organized on 60 areas in Poland (Fig.2.), 2 of which were situated in Lubuskie Woivodeship (Subsection 4.2.). As a consequence, the assignment of frequencies on the auction area 08.1 went to Gorzów Wlkp., while on the auction area 08.2 to Zielona Góra. According to the auction documents both cities are obliged to carry out the network building in a committed term (Subsection 4.4.). On one hand, building broadband networks with broadband access to the Internet by using the WiMAX technology gives the unique opportunity to improve a situation on the area where telecommunication infrastructure is poor and, on the other hand, it gives possibility to exploit financial help from the European Union up to 85% of expenses.
Źródło:: Pomiary Automatyka Kontrola; 2009, R. 55, nr 7, 7; 544-547
0032-4140
Pojawia się w:: Pomiary Automatyka Kontrola
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Timing Synchronization and Frequency Offset Estimation for OFDMA/TDD Mode in Downlink of IEEE 802.16-2004
Autorzy:: Rahbari, F.
Bakhshi, H. R.
Powiązania:: https://bibliotekanauki.pl/articles/227132.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: timing synchronization
carrier frequency offset estimation
IEEE 802.16
AWGN channel
multipath fading channel
Opis:: Timing and frequency synchronization are the important task in receiver. This paper proposes a timing synchronization and carrier frequency offset (CFO) estimation algorithm for orthogonal frequency division multiple access (OFDMA) downlink in IEEE 802.16e standard. This method has high performance and estimates CFO. The proposed scheme utilizes the conjugate symmetry property of preamble structure. Simulations are conducted for AWGN and multipath channels to demonstrate the performance of the proposed timing metric. Our proposed method can achieve reasonable performance at low SNR.
Źródło:: International Journal of Electronics and Telecommunications; 2012, 58, 3; 261-266
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Wi-Fi networks in small and medium-sized businesses (SMB)
Autorzy:: Sojak, M.
Głowacki, S.
Powiązania:: https://bibliotekanauki.pl/articles/93013.pdf
Data publikacji:: 2009
Wydawca:: Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:: Wi-Fi
wireless network
small business
medium business
IEEE 802.11
IEEE 802.15
IEEE 802.16 standard
WLAN
wireless local area network
Opis:: Wi-Fi is quite a new technology on the market. This paper’s aim was to prove the justifiability and profitability of this technology use in the small and medium-sized businesses sector. Advantages and disadvantages of this kind of network were also shown. An issue connected with data and configuration elements security was also raised. Other wireless technologies were also presented.
Źródło:: Studia Informatica : systems and information technology; 2009, 1(12); 55-65
1731-2264
Pojawia się w:: Studia Informatica : systems and information technology
Dostawca treści:: Biblioteka Nauki

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