Mahmoud Ayesh Alayesh

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Power control is a major concern in cognitive radio networks. Here secondary users compete in an opportunistic way to access idle spectrum of primary users. However, most existing studies have only looked at the interactions between secondary users, without considering the impact of primary user behaviors. In this study a novel realistic primary-secondary(More)
Power control is a crucial concern in cognitive radio networks where secondary users compete to access spectrum of primary users. However, most existing studies in this space have only looked at the interactions between secondary users, without considering the impact of primary user behaviors. Along these lines, this study proposes a novel realistic(More)
Power control is an important resource management concern in wireless cognitive radio networks. In particular, the transmit powers of base stations and handsets must be carefully adjusted to help reduce interference between users and also improve cell capacity. Indeed, large gains can be achieved by taking into account primary user's behaviors and allowing(More)
In cognitive radio networks, power control is considered to be a very important concern where secondary users, which are equipped with cognitive radios, try to access the unused spectrum of licensed primary users in an opportunistic way. Cognitive radios enable the secondary users to sense the presence of primary users and tune the channel (spectrum band)(More)
—A reconfigurable stacked Microstrip Patch Antenna (MSA) of operating frequencies in the range of (2-5) GHz is proposed for wireless applications. The new antenna is composed of two layers, the bottom layer is a patch with two slots designed on each side that can be controlled via switches. By adjusting the status of the switches, the resonance frequencies(More)
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