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This contribution is aimed at presenting the scenario of the expected atmospheric impairments suffered by a radio link operating in the W band, as derived by the present theoretical and experimental knowledge. The contributions to signal fade due to gases, clouds, scintillation and rain (with emphasis also on the impact of the hydrometeor size distribution), as well as the melting layer characteristics...
In TLC satellite systems operating in the Ka-band, the dynamic control of the on-board antenna pattern is recognized as an effective countermeasure against the atmospheric attenuations due to rain, water vapour, etc. The on-board available power is better exploited when distributed on the service area by privileging the sub-regions requiring, at a given time, more power to counteract the local attenuation...
In this study a wireless multiple-input multiple-output (MIMO) communication system operating over a fading channel is considered. Data packets are stored in a finite size buffer before being released into the time-varying MIMO wireless channel. The main objective of this work is to satisfy a specific quality of service (QoS) requirement, i.e. the probability of data loss because of both erroneous...
The self-organizational ability of ad-hoc Wireless Sensor Networks (WSNs) have led them to be the most popular choice in ubiquitous computing. Clustering sensor nodes and organizing them hierarchically have proven to be an effective method to provide better data aggregation and scalability for the sensor network while conserving limited energy. In this paper we provide a comprehensive analysis of...
In multiple antenna wireless systems (MIMO), the channel capacity can be modeled as a Gaussian random process under certain conditions. Channel capacity outages introduce a probability of data loss at the physical layer. Accounting for such effects on the network design requires a cross-layer approach, which involves joint consideration of physical (PHY) and upper layer performances (i.e. Medium Access...
Accurate and sparse representation of a moderately fast fading channel using bases functions is achievable when both channel and bases bands align. If a mismatch exists, usually a larger number of bases functions is needed to achieve the same accuracy. In this paper, we propose a novel approach for channel estimation based on frames, which preserves sparsity and improves estimation accuracy. Members...
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