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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...
Wireless communication networks based on non-scheduled random medium access methods, such as carrier sense multiple access with collision avoidance (CSMA/CA), can be affected by in- channel interference at two different levels: at physical (PHY) layer, in terms of data packet collisions, and at medium access control (MAC) layer, in terms of channel occupation. The separate knowledge of such interference...
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...
Detection and evaluation of impairments in the baseband section (I/Q impairments) of orthogonal frequency-division multiplexing digital transmitters are dealt with. A new measurement method is, in particular, proposed with the aim of overcoming key limitations exhibited by already-available approaches, which are generally designed for traditional digital transmitters and based on I/Q diagram analysis...
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