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This paper is concerned with the simultaneous stabilization of a collection of battery-powered networked control systems (NCSs). A new model is presented to capture the bandwidth and transmission energy constraints effects on the NCSs. By using average dwell time techniques, sufficient conditions for the exponential mean square stability of a single plant are derived at first. Then based on the scheduling...
It was reported for specific bats, that they use a certain scheme to shift the frequencies of their echo location calls to counteract interferences with conspecifics. As in road traffic, an increasing number of cars is equipped with radar sensors, there is also the problem of mutual interference. The available frequency bands are limited, so a randomized frequency hopping will not be the best solution...
Traditional healthcare solutions oblige patients to stay in hospital; bio-signal monitoring and treatment dosing require the presence of specialized personnel. In turn, this scenario implies high-cost, especially for chronic diseases or fragile people surveillance. Wearable sensor-based healthcare solutions may be an effective approach for lowering costs, since they offer good performance and can...
A switched capacitor interface is presented in this paper for a ±50g capacitive micro-accelerometer. In order to suppress the flicker noise of the frontend, a switched capacitor proportional-integral controller combined with a charge sensitive amplifier using correlated double sampling is proposed. The controller has a simple structure with minimized number of switches and cancels the offset of both...
Analog transmission of an Alltop digital sequence has been investigated. Three approaches to generate the continuous version of the Alltop sequence were studied — linear interpolation, Fourier transform (FT) expansion and direct over-sampling. The feasibility of the transmission using the three methods was investigated through simulations and waveform synthesis in an actual waveform-agile radar system...
Partial discharge (PD) is one of the predominant factors to be controlled to ensure reliability and undisrupted functions of power generators, motors, Gas Insulated Switchgear (GIS) and grid connected power distribution equipment, especially in the future smart grid. The emergence of wireless technology has provided numerous opportunities to optimise remote monitoring and control facilities that can...
Technologies for millimeter wave (mmWave) communication are at the forefront of investigations in both industry and academia, as the mmWave band offers the promise of orders of magnitude additional available bandwidths to what has already been allocated to cellular networks. The much larger number of antennas that can be supported in a small footprint at mmWave bands can be leveraged to harvest massive-MIMO...
Dynamic spectrum sensing and opportunistic access in cognitive communications enable secondary users to recognize and utilize the white spaces of the licensed bandwidth. Our prior work proposed a non-uniform scheme of bandwidth partition and traffic allocation with the aim of regularizing the primary user's (PU's) bandwidth occupancy pattern, which was able to improve the performance of the secondary...
This paper shall present the design and implementation of a MATLAB/Simulink Model for the sensorless control of a PMSM in a steer-by-wire application. Simulation results for position, speed and current loops in both open-loop and closed-loop sensorless modes are shown. The sensorless method is based on the tracking of saliencies by high frequency injection.
In an attempt to face the anticipated spectrum crunch and inspired by the possibility of extending LTE-A to the unlicensed spectrum (LTE-U), in this paper we devise an adaptive channel assignment scheme for video streaming over LTE-U small cells. The proposed scheme adaptively assigns video frames to a subset of monitored channels with the objective of reducing possible starvation instants at user...
Precise understanding of the sea bottom characteristics and accurate identification of objects on the seabed are critical in many underwater applications. The severe multi-path along with the time varying and random reflections from the surface and the bottom of shallow waters, present an interesting and complex signal processing problem. A thin line hydrophone array, deployed from small Autonomous...
One of the challenges faced by today's Internet of Things (IoT) is to efficiently support machine-to-machine communication, given that the remote sensors and the gateway devices are connected through low bandwidth, unreliable, or intermittent wireless communication links. In this paper, we quantitatively compare the performance of IoT protocols, namely MQTT (Message Queuing Telemetry Transport), CoAP...
The usage of autonomous vehicles is rapidly expanding on both the ground and air. With more autonomous vehicles in close proximity to humans, new and better sensors need to be developed to manage these relationships, both good and bad. This new age of autonomous activity will bring both new opportunity and new threats to people and property. One of these threats will be from cheap, very functional...
The 2.4 GHz ISM band is crowded with a wide variety of wireless devices operating under various protocols. For many reasons, medical device manufacturers are increasingly incorporating wireless technologies into their devices, many of which operate in the ISM band. Monitoring and characterizing wireless spectrum utilization is vital to better plan wireless network deployments and to assess the risk...
Due to insufficient network infrastructure, tactical networks suffer the imbalance between network resource supply and transmission demands generated by deployed sensing devices. On top of that, those sensing devices are in multiple modalities with the need of fusing diverse inputs into unified formats to provide answers to query tasks. We addressed issues under network resource constraints on exploiting...
The 2.4 GHz ISM band is crowded with a wide variety of wireless devices operating under various protocols. For many reasons, medical device manufacturers are increasingly incorporating wireless technologies into their devices, many of which operate in the ISM band. Monitoring and characterizing wireless spectrum utilization is vital to better plan wireless network deployments and to assess the risk...
This paper focuses on the quantization of soft decision based cooperative spectrum sensing (CSS). The soft data fusion CSS schemes in previous research works provide considerable enhancement in the probability of detection, but at the expense of increased bandwidth required for transmitting the sensing measurements to the Fusion Center (FC). In this paper, Maximum likelihood Estimation (MLE) statistics...
This paper highlights the benefits of IEEE 802.15.4's unslotted carrier sense multiple access collision avoidance (CSMA-CA) MAC layer acknowledgements (ACKs) in ad-hoc wireless networks. We performed different experimental studies to analyse the impact of enabling and disabling the ACKs on event detection ratio (EDR), available bandwidth estimator, and flow admission control algorithms. Comparison...
This paper presents a high accuracy and high bandwidth current sense circuit for digitally controlled DC-DC buck converters. The circuit uses lossless inductor DCR current sensing and a sigma delta modulator ADC to sense the average current in the inductor to high accuracy. These accurate but low bandwidth measurements are unsuitable for use in feedback control loops as their acquisition delay would...
Mobile Mapping is currently dominated by optical camera or laser based systems. Due to new semiconductor technologies, compact and light weight FMCW radar systems in the lower terahertz domain become applicable for such scenarios. With constant increasingly higher resolution capabilities in the subcentimeter domain such radar sensors could supplement existing sensor suites in challenging environments...
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