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We are motivated to exploit the broadcast nature of a radio medium in combating its unreliable and time-varying characteristics. This leads to cooperative transmission where a neighbor node keeps a copy of an overheard packet and helps in retransmitting the overheard packet to its intended destination when the original transmission fails. Cooperative transmission improve wireless network performance...
Interference management is a crucial point in cognitive radio. To deal with the interference, systems are used to consider the interference power and its spectral occupation. The negative effects of such interference are often estimated considering that the interference is Gaussian. Ultra Wide Band (UWB) systems are typical systems to be considered in a cognitive radio framework; their huge spectral...
This paper presents the impact of antenna design over the capacity of a IR-UWB system in a multi-user interference environment. A new antenna design is proposed and it is showed using a new performance criterion that for this design, the communication capacity given by the Sholtz's pulse might be outperformed by using some other types of pulses. More than that, the proposed criterion might be used...
This paper develops an ultra wide band antenna and a new performance criterion: the communication capacity (achievable bit rate) in presence of the MUI model in a pulse shape fashion by the antenna. The development of this study would lead to the investigation of more UWB antennas and pulse shapes optimizations.
A possibility to classify the valuable documents is represented by their color. As far as the banknotes are concerned, one predominant color is generally associated to a certain value. This fact represent one of the essential criteria for the automatic recognition of the authenticity of banknotes. A camera CCD - RH 1100-DuncanTech. (Redlake) and a board of image acquisition National Instruments N11424...
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