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In this paper, we study dynamic load-balancing spectrum decision for a cognitive radio network (CRN) that dynamically distributes packets from the secondary user (SU) to different available primary channels. We consider two different classes of services at the SU, i.e., delay sensitive (DS) and best effort (BE) services, and assign a higher priority to the DS services. We apply priority queuing model...
In this paper, we investigate the impact of channels that have a bursty nature in a cognitive radio network scenario. Our goal is to design a general statistical model that can handle bursty primary user (PU) channel usage. The proposed model describes idle periods with a discrete platoon arrival process (PAP) and describes busy periods with a discrete phase type (PH) distribution. This channel model...
A computer-PLC (Programmable Logic Controller) control solution was proposed for the artificial trough rainfall simulator. The rainfall process with continuous changing intensities was simulated automatically with the control strategy. Frequency-tunable pulse signal of specified duty ratio was generated precisely using pulse module of PLC to drive nozzles oscillating at required frequency. Thus, arbitrary...
In this paper, we focus on the polling mechanism adopted in IEEE 802.16 networks operating in PMP (Point-to- Multipoint) mode between the base station and the subscriber stations. We develop a queueing model for computing the performance of the polling service traffic, which takes into account the polling period amongst the various subscriber stations served by a single base station. Using our model,...
Most state-of-the-art LVCSR systems are based on continuous density HMMs, which are typically implemented using Gaussian mixture distributions. Such statistical modeling systems usually operate slower than real-time, largely because of the heavy computational overhead of the likelihood computation. The objective of our research is to investigate application of modern SIMD technology to speed up the...
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