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Priority queue-based techniques improve spectrum efficiency by allocating the underutilized spectral bands (holes) of primary users to secondary users in Cognitive Radio Networks (CRN). This article proposes a Distributed Precedence Queuing scheme for Efficient Spectrum Management (DPQESM) in CRNs. The proposed method classifies the available channels into periodic and aperiodic based on the state...
Networked control systems (NCS) have attracted considerable attention in recent years. While the stabilizability and optimal control of NCS for a given communication system has already been studied extensively, the design of the communication system for NCS has recently seen an increase in more thorough investigation. In this paper, we address an optimal scheduling problem for a set of NCS sharing...
The network selection problem in a heterogeneous network environment is studied in the paper. A 3-Param network selection algorithm for CR terminals is proposed. Both the factors that are sensed by the CR terminals and the factors that cannot be gained beforehand are taken into account in the algorithm. Through the evaluation of the primary networks integrating these factors, the algorithm will make...
In view of the numerous clock domain crossings found in modern systems-on-chip and multicore architectures precise metastability characterization is a fundamental task. We propose a conceptually novel approach for the experimental assessment of upset rate over resolution time that is usually employed to extract the relevant characteristics. Our method is based on connecting a time-to-digital converter...
We design a novel DRAM controller that bundles and executes memory requests of hard real-time applications in consecutive rounds based on their type to reduce read/write switching delay. At the same time, our controller provides a configurable, guaranteed bandwidth for soft real-time requests. We show that there is a fundamental trade-off between the latency guarantee for hard real-time requests and...
With the development of high-speed mixed-signal circuits, signal timing for the overall system have a crucial impact. Analog delay circuits are widely used in high-speed circuits. In this paper, a compact gm-c active delay is used, while a delay reference loop is used to adjust the delay time. The design and simulation are implemented by 0.13 um SiGe BiCMOS. The chip occupies 0.40 mm2 die area, consuming...
A 0.5–3GHz true-time delay (TTD) phase shifter circuit is implemented. Basing on active delay cells and active switches, the coarse delay is achieved. The LC artificial transmission line (ATL) provides continuous delay. The delay variation of the total delay is less than 2.4%. Using broadband matching and shunt peaking techniques, larger bandwidth and flatter group delay is obtained in phase shifter...
Modal dispersion severely limits data rates in multimode fiber (MMF) links. The use of principal modes (PMs) in lossless MMFs mitigates the impact of modal dispersion over a large bandwidth and permit effective multiplexing due to their orthogonal nature. However, in fibers with mode-dependent losses (MDL), the principal modes experience different losses and are no longer orthogonal. In this paper,...
Many real world networks are characterized by long delays, frequent path breaks, mobility, and lack of infrastructure. Class of networks which can cope up with such environments are called Delay Tolerant Networks (DTN). Architectures with a separate bundle layer, have been implemented in specific applications such as interplanetary networks (IPNs). However, the addition of bundle layer to existing...
Increased data rate requirements in short haul applications has enhanced the research on data transmission using graded-index multimode fibers (GI-MMF). Among the several optical launching techniques for exciting the fundamental mode in an MMF mode-field diameter matched twin-spot launching (MFDM-TSL) is a technique with much higher alignment tolerance. In this paper we study the influence of wavelength...
This paper proposes an application-aware multipath flow routing framework that integrates Machine Learning Techniques (MLT) in Software Defined Networks (SDN). Applications generated by the devices are diverse in nature, for each application bandwidth and delay requirements vary. The flows in the network compete for a constrained resource such as bandwidth or low latency path, an intelligent flow...
Software defined network with centralized control and flexibility of programming has been widely used. And congestion could occur easily in this kind of network owing to more elephant flows with increasing network requirements. To resolve the problem, this paper proposed an ant colony optimization algorithm based on flow scheduling system (TSACO). The system accurately detects elephant flows with...
Internet of Things (IoT) is combination of things and Internet. Things in IoT communicate via Internet. IoT has several heterogeneous devices and results to many issues. In this work we have proposed agent based job classification and resource allocation in IoT. In the proposed methodology agent uses the Fuzzy Interference System. Agents are defined in two hierarchicy namely at Local Processor Agency...
A phased array lens has limited bandwidth due to the phase shifters that collimate and scan the beam. A wideband signal requires time delay units in place of phase shifters. This paper investigates the feasibility of implementing time-delay units in array lens antennas. Time-delay compensation mechanisms for array lens antennas are outlined and investigations are carried to determine the required...
State-of-the-art DRAM cache employs a small Tag-Cache and its performance is dependent upon two important parameters namely bank-level-parallelism and Tag-Cache hit rate. These parameters depend upon the row buffer organization. Recently, it has been shown that a small row buffer organization delivers better performance via improved bank-level-parallelism than the traditional large row buffer organization...
Information Centric Networks(ICN) can employ per-node forwarding strategies to provide an optimal transport service. This paper describes the design of an ICN Forwarder that implements Application-Adaptive Forwarding(AAF): an optimized multipath forwarding strategy for differentiated services that can adapt dynamically to changing link characteristics and implement different operator policies with...
Supporting end-to-end quality of services for real-time interactive video applications such as videoconferencing and distance learning across the Internet requires a collection of independent networks or domains to work together to route packets between source and destination. Routing packets across the Internet using a feasible path - a path that meets the quality of service (QoS) attributes of video...
New developments in energy efficient wireless communications systems and indoor location and tracking algorithms have created a greater demand for accurate propagation models. In this paper a frequency domain full wave propagation model is used to produce accurate power delay profile information. The propagation model is based on the volume electric field integral equation (VEFIE). The VEFIE is solved...
In the present paper we analyse small-scale fading of reflections at 60 GHz using different antennas and bandwidths. The aim is to investigate the deterministic property of the channel in view of modelling and deployment of systems with larger bandwidths and higher directivity. We have investigated the scattering effect of a reflection on a wall emulating a beam-former in a NLOS condition. The results...
3×3 Split Ring resonators with inner ring rotation are etched at the back side of Circular microstrip antenna with elliptical rings. Rotation for multiple angles leads to an enhancement in impedance bandwidth. The selected UWB antenna has fabrication dimensions of 45 mm × 31mm × 1.27 mm. The rotation of the inner rings occur clockwise and counter clockwise for −47°, 33° and 10°. The preferable enhanced...
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