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Nowadays, most of the geographical areas are covered by multiple heterogeneous networks. Moving terminals within these areas usually switch from a network to another for different motivations, such as enhancing quality of service, improving throughput, reducing monetary cost, etc. Terminal switching, aka handover, may occur to a spectrum band where the terminal is unlicensed as implied in the cognitive...
This paper proposes a new cognitive anti-jamming stochastic game model for multi-agent environments in which each wideband autonomous cognitive radio (WACR) attempts to predict and evade the transmissions of other radios as well as a dynamic jammer signal. The cognitive framework is divided into two operations: sensing and transmission. Each is helped by its own learning algorithm based on Q-learning...
Unmanned aerial vehicles (UAVs) are rapidly increasing in popularity. Despite attempts at regulation, stopping small, Class 1 (typically hobby-grade) UAVs from entering protected or sensitive airspace is an unsolved problem. Many companies and researchers offer a piece of a solution, but as of this writing, there is no publicly available, feasible, end-to-end solution. Ultimately, what is needed is...
To optimize the classic design trade-off between EMI noise and power efficiency in GaN power drivers at 10MHz and beyond, a closed-loop adaptive Miller Plateau sensing (AMPS) technique is proposed. In order to mitigate long delays and low accuracy issues in conventional Miller Plateau (MP) sensing approaches, an emulated MP tracking (EMPT) technique is adopted to achieve instant MP start point sensing...
In this study, we propose an offset cancellation technique with the spin-torque memristors where are unpredictable threshold voltage changes of transistors that results in the input referred random offset (IRRO) of amplifiers. Motivated by this fact, this study focuses on the IRRO cancellation in sense amplifiers with the aid of the spin-torque memristor technology. The spin-torque memristors in series...
Node buffer size has a big influence on performance of Mobile Opportunistic Networks (MONs). This is mainlybecause each node should temporarily cache packets to deal with the intermittently connected links. In this paper, we study fundamental bounds on node buffer size below which the network system can not achieve the expected performance. Given the condition that each link has the same probability...
The use of UWB system front-end matching with the antenna from the VCO side adjustment, the key in the vicinity of the VCO circuit matching adjustment; because eight antennas, each antenna will have some slight differences in matching, resulting in the received DC value is not Will be in the same level, and the switch circuit in the switch antenna, it will allow a peak level (about 100ms), and switch...
The article considers algorithms of operating the multiphase unit for balancing main load based on selection of load phase connection to electric network phases with retaining an original order of load phases interlace. The influence of the operating algorithms on the load asymmetry coefficients of zero and negative sequences at the electrical point is analyzed based on computer modeling the treed...
A low power integrating mixer successive approximation register (SAR) prototype chip for spectrum sensing is fabricated for portable transceivers targeting IEEE 802.22 cognitive radio applications. The integrating mixer SAR combines mixing, current-domain windowing, and integration to implement the short-time Fourier transform. Integration with programmable time constant is incorporated within the...
A switched capacitor low-side current sensing signal conditioning circuit with high dynamic range is demonstrated in AMS 0.35 μm, 3.3 V CMOS process. The design incorporates a Switched Capacitor Programmable Gain Amplifier (SC-PGA) and multi-bit second order ΔΣ-ADC. The switched capacitor eliminates the need for explicit level-shifting and chopping circuits thus facilitating sensing of input signal...
Position sensorless control of switched reluctance motors reduces the system cost and increases the drives overall reliability. The flux-linkage method is a commonly applied technique when sensorless control of switched reluctance motors is pursued. The sensing quality, though being sensitive to model errors and further effects, can be sufficient for a number of applications. However, sophisticated...
Circuit breaker is the essential electrical equipment of power plants and substations in distribution equipment. It shoulders the dual task of control and protection in Power System. Breaker as the power system is an important switching equipment, the merits of its motion feature has an important impact on the safety of the grid. Due to the motion characteristics of a conventional circuit breaker...
This paper proposed a new wide-bandwidth hybrid supply modulator for LTE-A power amplifier. The proposed wide-bandwidth hybrid supply modulator is for long term evolution (LTE)-advanced power amplifier. This proposed modulator uses simple linear amplifier structure to achieve 100MHz tracking speed. This proposed modulator proposes a bandwidth control to improve the efficiency of the supply modulator...
Street lighting is an essential community service, but current implementations are not energy efficient and and require municipalities to spend up to 40% of their allocated budget. In this paper, we propose heuristics and devise a comparison methodology for new smart lighting solutions in next generation smart cities. The proposed smart lighting techniques make use of Internet of Things (IoT) augmented...
This paper presents the design, implementation and experimental results of an energy harvesting system to extract energy from power transmission lines. The energy is extracted from a high permeability core clamped on a high alternative current cable. A coil wound on the magnetic core can harvest energy effectively from the power line when the core is operating at the non-saturation region. Little...
In recent years, wireless sensor network technique develops rapidly, but its operation life is still limited by the energy storage element. Thus, if ambient energy can be harvested to supply the sensors, the operation life can be increased and the cost can be reduced. A boost converter for indoor photovoltaic energy harvesting with low power consumption is proposed in this work. For harvesting energy...
In a cognitive radio network (CRN), a premise for two nodes to communicate is having a rendezvous which means that they switch to the same channel simultaneously. Most existing channel hopping solutions for the rendezvous problem is for a homogeneous CRN where nodes have the same type of cognitive radio and thus can sense the same spectrum. In reality, nodes have different types of cognitive radios...
In this paper we propose a novel mission control strategy for a group of agents to locate an unknown source, represented as maximum of a scalar field, and to track a specified level curve. We propose a distributed control scheme based on hierarchy formation and reduced topology. Without prior knowledge of the field, the agents, equipped with local sensors, navigate in ℝp using an estimated gradient...
Smart home is a house that uses Internet of Things(IoT) to monitor the environment, control the electric appliances and communicate with the outer world. Smart home is a complex technology, but a developing one. A smart home automation system has been developed primarily because in today's time and world, everybody's in a surge and wishes to screen and get to everything without being there physically...
The need for skilled arthroscopic surgeons is increasing due to the large number of arthroscopic interventions performed annually. Surgical simulators are beneficial training platforms for practicing those difficult to learn surgical tasks. In this study, a sensorized physical shoulder simulator was developed. This simulator incorporates switch sensors for objective assessment of probing tasks and...
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