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A ZigBee (802.15.4) lighting network is potentially vulnerable to interference by other wireless technologies that operate in the same Industrial, Scientific and Medical (ISM) frequency band, such as Wi-Fi (802.11). In order to minimize the effect of external interference, nodes can dynamically adapt radio parameters, based on monitoring information about the current spectrum usage and relevant performance...
The request-to-send (RTS)/clear-to-send (CTS) scheme uses a four-way handshake to ensure proper spatial and temporal reservation of the multiple-access wireless LAN channel. By considering the (interdependence of) successive capture probabilities for a cycle of an RTS, CTS, data packet and acknowledgement, we analyze the throughput of the RTS/CTS scheme in a new mathematical framework. We also propose...
Loop structures in software code may reveal essential information about implemented algorithms and their parameters, even if the observer has no knowledge about which instructions are executed. Regular patterns can for instance be observed in power consumption, instruction fetches in external memory, or radiated EM energy. This paper addresses the use of dummy operations to obscure the details of...
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