Wyniki wyszukiwania - BazTech

1

Interferencje w bezprzewodowych sieciach typu ad-hoc z wielodostępem kodowym

Jackowski S., Kocot B.

Logistyka

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2009

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nr 6

CD-CD

PL

W referacie przedstawiono wyniki obliczeń poziomu interferencji w bezprzewodowych sieciach typu ad-hoc o przyjętej strukturze i funkcjonujących w oparciu o wybrane standardy organizacji IEEE oraz ETSI. Zaprezentowano również wyniki symulacji wymiany danych celem porównania w określonych warunkach propagacyjnych najnowszych rodzajów struktur sygnałowych (FHSS, DSSS, OFDM), które zostały zastosowane w standardach pakietowych sieci bezprzewodowych.

EN

In this report there were discussed a results of interference level calculations in wireless ad-hoc networks with assumption architecture working based on selected IEEE and ETSI standards. There were presented a results of data exchange simulations in order to compare in specific propagation conditions modern signal structure's (FHSS, DSSS, OFDM) which were implemented in standards of wireless packet networks.

2

A comparison of Bluetooth scatternet formation algorithms with reference to interference issues

Klajbor T.

Poznan University of Technology Academic Journals. Electrical Engineering

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2007

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No 54

65-72

EN

Standard Bluctooth does nut precisely determine the rules of forming Bluctooth scalternets. So far many interesting scatternel forming algorithms have been proposed. This publication tries to assess selected Bluctooth networks forming algorithms taking into account a few key parameters. In particular, the aspect of impact of topology created in a given way, has been researched taking into account potential interferences inside the scatternet (interferences between piconcts) and on other technologies working in ISM band (that is IEEE 802. Mb).

3

Effectiveness of Bluetooth scatternet coexisting with IEEE 802.11b

Klajbor T.

Journal of Applied Computer Science

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2006

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Vol. 14, nr 1

97-106

EN

ISM band is made use of by many various wireless transmission technologies. Thereby, problems related with ensuring a specific efficiency for these networks occur. This Article analyses an example of interference coming from IEEE 802.11b transmitters (colloquially named Wi-Fi) and other Bluetooth (BT) piconets that have influence on transmission in Bluetooth scatternet and proposes a method for determining a packet error rate (PER) for a given Bluetooth piconet.

4

Seamless roaming between UMTS and IEEE 802.11 networks

Matusz P., Machań P., Woźniak J.

Journal of Telecommunications and Information Technology

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2004

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nr 4

21-27

EN

Mobile Internet access is currently available mainly using 2G/3G cellular telecommunication networks and wireless local area networks. WLANs are perceived as a local complement to slower, but widely available cellular networks, such as existing GSM/GPRS or future UMTS networks. To benefit from the advantages offered by both radio access networks, a mobile user should be able to seamlessly roam between them without the need to terminate already established Internet connections. The goal of this paper is to present an overview of the profitability of performing vertical handovers between UMTS and IEEE 802.11b using Mobile IP. Several simulations have been carried out using NS-2, which prove that handovers from IEEE 802.11b to UMTS can, under certain circumstances, be profitable not only when there is no more IEEE 802.11b coverage. Simulation results show that a mobile user should be able to roam between these networks depending on the current available channel bandwidth and quality, generated traffic type and number of users in both of them.