Electrical & Electronics Engineering

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Electrical & Electronics Engineering

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Author: search.filters.author.Yinusa Ademola AdediranSubject: search.filters.subject.QoS

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    Queue Behavior of Statistical Multiplexers
    (The IUP Journal of Information Technology, 2013-03-01) Ajiboye, Johnson Adegbenga; Yinusa Ademola Adediran; Mary Adebola Ajiboye
    In a statistical multiplexer, packets are assumed to be arriving at the multiplexer with the inter arrival times being Independent and Identically Distributed (IID). The service time is also IID. The inter arrival times are generated from the corresponding probability distribution. When a packet arrives to an empty or idle system, the packet is immediately served; otherwise, it is queued. In this paper, the queue behaviors in the multiplexer's buffer were examined. The results show that the average number of packets in the multiplexer queue increases in an exponential form with increase in utilization; and at high utilization, there is a dramatic increase in the number of packets in the multiplexer queue which may lead to packet loss when there is no sufficient buffering. Comparison of the simulation and analytical results for the mean number of packets in an M/M/I Multiplexer Queue reveals that results are within ±23% for offered load of up to 90%.
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    Dynamic Spectrum Access (DSA) in Wireless Cognitive Radio Networks (WCRN)
    (2013-02-01) Ajiboye, Johnson Adegbenga; Yinusa Ademola Adediran; Mary Adebola Ajiboye
    Dynamic Spectrum Access (DSA) is a technology that senses the unused 'free' but allocated portion of the radio frequency spectrum on a non-interfering basis. These unused bands are also known as 'holes' or 'white spaces'. DSA also refers to the time-varying, flexible usage of parts of the radio spectrum under consideration of regulatory and technical restrictions. This type of spectrum access is due to the dynamic behavior that the Secondary User (SU) must employ in order to access the spectrum, while avoiding interfering with a Primary User (PU). Intelligent or Cognitive Radio (CR) is a platform on which the DSA can be implemented. CRs are radio systems that autonomously coordinate the usage of spectrum. They utilize radio spectrum when it is not being used by incumbent (primary) radio systems. Underutilized spectrum can be exploited with the concepts of DSA and CR. This paper reviews the techniques that can be deployed for DSA reliably in a Wireless Cognitive Radio Network (WCRN) and models of network architecture-based DSA in Cognitive Radio Networks (CRN).