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Wireless networks such as WiFi suffer communication performance issues in addition to those seen on wired networks due to the characteristics of the radio communication channel used by their Physical Layers (PHY). Understanding these issues is a complex but necessary task given the importance of wireless networks for the transfer of wide ranging packet steams including video as well as traditional...
The interference effects on voice over Internet protocol (VoIP) applications over wireless local area networks (WLANs) are here dealt with. In particular, attention is paid to the IEEE 802.11 g standard, with Bluetooth signals, additive white Gaussian noise (AWGN) and competitive data traffic acting as interferer. The analysis is conducted experimentally following a cross-layer approach and through...
The performance of video streaming applications over wireless local area network (WLANs), in presence of interference, are here dealt with. In particular, the IEEE 802.11g standard is considered and Bluetooth and WLAN competitive data traffic are analyzed as interferer. The analysis is conducted experimentally following a cross-layer approach and through the use of properly developed testbed within...
A new digital signal processing method capable of measuring signals typical parameters, such as channel power, channel bandwidth, and carrier frequency, is presented hereinafter. In particular, thanks to some attractive features of the exploited MUSIC algorithm, the method allows the measurement of typical parameters of wideband signals even though they occupy, fully or partially, the same frequency...
Researches and development efforts in wireless networking and systems are progressing at an incredible rate. Among them, measurement and analysis of performance achieved at network layer and perceived by end users is an important task. In particular, recent advances concerning IEEE 802.11b-based networks seem to be focused on the measurement of key parameters at different protocol levels in a cross-layered...
Coexistence issues between IEEE 802.11b (Wi-Fi) wireless communication networks and IEEE 802.15.4 wireless sensor networks (WSN), operating within the same 2.4 GHz ISM-band, are hereinafter assessed. In particular, meaningful experiments performed through a suitable testbed and a cross-layer measurement approach are presented. Such experiments are executed both at physical layer, through measurements...
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