Mahmoud Abdullahi

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The study presents the behaviour of wood ash / OPC concrete. Chemical analysis of wood ash, bulk density, sieve analysis and specific gravity of wood ash and aggregates, consistency, setting time and slump test of the fresh paste were conducted to determine the suitability of the materials for concrete making. Mix ratio of 1:2:4 and percentage replacement(More)
In this paper, we will examine the effects of Carrier Frequency Offset (CFO) on the OFDM signals. We will also show the deterioration in Bit Error Rate (BER) as well as the loss in Signal to Noise Ratio (SNR) due to the CFO for an OFDM system. The paper also presents comparative analysis between three different CFO estimation methods namely: Cyclic Prefix(More)
The challenges associated with the determination of detection threshold due to uncertainty was addressed in this paper. The technique of Cooperative Sensing Spectrum (CSS) was used to model the functional subsystems that made up the Cognitive Radio System. The model developed utilizes channel centre frequencies. Also, implemented and threshold actualized(More)
Cognitive Radio threshold optimization has been an on-going research concern. With mature energy detector algorithms, the CR implemented in this work uses an energy detector as the primary sensing module for the primary user signal. In order to achieve this detection in an efficient way, various techniques have been proposed in literature for optimization(More)
Switching off network links/nodes for energy efficiency is no longer a new thing to the Internet community but the important thing is its dynamic deployment. Up until now, the normal paradigm in energy aware traffic engineering is to deploy a pruned network topology based on historic traffic matrices or to manipulate, on the fly, the traffic routings based(More)
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