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An innovative design for capacitive wide bandwidth vibration sensor is proposed and verified by experiments in this work. Three-dimensional and high-g vibration motions can be individually detected by the proposed vibration sensor such that the other-axis effect can be reduced and the sensitivity can be enhanced. The shock absorb mechanisms, i.e., fixed-fixed beam stopper and cantilever beam stopper,...
With emerging synchronized phasor measurement technology, estimating dynamic state in real time (post fault) for the grid operation become feasible. However, PMU measurements undergo random errors and bad data unavoidably caused by the sensor errors, disturbances, etc. The traditional centralized state estimation methods for power system static state are not applicable for the electro-mechanical transient...
Spectrum sensing is an essential functionality of cognitive radio networks. In this paper, a noncooperative game framework is proposed for studying the interactions between multiple secondary strategic users in spectrum sensing. The licensed spectrum of single primary user is divided into K sub-bands, each secondary user operates exclusively in one sub-band. In each time interval, secondary users...
Wireless Sensor Network (WSN) is still a hottest research topic which can be applied to a lot of new research field such as robotic and smart grid. Its not only used for detecting the new environment but also monitoring any situation which has dynamic variation. However, the sensor node is relied on the battery energy that limited the lifetime of entire network. In this paper, we proposed a novel...
A chip-package co-design method is presented for high frequency mixed SoC. Based on the analysis of simulation result of package and chip, a RC circuit which is composed of resistor and capacitor is designed on chip to suppress the affect of Simultaneous Switch Noise(SSN). Consequently, chip-package co-simulation achieves a good agreement with measurement as the co-design method is used to predict...
High data availability is an important feature of P2P storage system. Erasure coding is a common method employed to support the property. But the technique requires an original file to produce redundant data. On the contrary regenerating code, without maintaining the original file, solves the problem through collecting encoded information in a distributed way. However, there is a drawback in this...
This paper firstly introduces the mesh structure of IEEE 802.16, explains the three-way handshaking mechanism under the mesh structure, then questions the conflict problem existing in the previous protocols, and proposes a method to improve the three-way handshaking mechanism. According to simulation results, it performs well, not only shorten end to end delay, but also increase throughput.
For cellular mobile telecommunication, cell identification is an indispensable initial process to establish a communication link. Cell identification requires high computational complexity and accuracy in a short time, especially during the handover process. To achieve high-performance cell identification with low-complexity for the orthogonal frequency division multiplexing (OFDM) systems, this work...
A novel 50% duty-cycle corrector (DCC) of digital signal processing (DSP) systems, designed with a purely digital phase-blending technique, is presented in this paper. The novel features of the proposed DCC includes a higher reliability against process, voltage and temperature variation due to the use of the synchronous mirror delay (SMD) technique, no-skew output clock, and a much faster duty-cycle...
The clock is a periodic synchronization signal used as a time reference for data transfers in synchronous digital systems. However, the clock skew constrains the improvement of clock frequencies and affects the reliability of systems. One skew reduction technique is the use of clock deskew circuits. They can be classified into two methods: delay-locked loop (DLL) deskewing and synchronous mirror delay...
This paper presents a distributed fermat-point range estimation strategy, which is important in the moving sensor localization applications. The fermat-point is defined as a point which minimizes the sum of distances from three sensors inside a triangle. This point is indeed at the trianglepsilas center of gravity. We solve the problems of large errors and poor performance in the bounding box algorithm...
Sink mobility has become an increasingly important requirement of various sensor network applications. Handling such mobile sink conditions brings new challenges to large-scale sensor networking. This investigation proposed a hybrid-structure routing protocol (HSRP) that combines the benefits of grid-based and cluster-based structures. Grid-based structure is designed to solve the cluster head selection...
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