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A CMOS receiver for optical wireless communication is presented. A stable feedback transimpedance amplifier (TIA) is designed adopting a current-mode amplifier as its feedforward gain element. A band-pass limiting amplifier is employed to boost the outputs of the receiver front-end. Implemented in a 0.35 um CMOS, the optical wireless receiver achieves a maximum transimpedance gain of 95.9 dBΩ. The...
A sensor network consists of a large number of sensor nodes which have sensing functions and wireless communication functions, and a single sink node which is a base station node of the sensor network. Sensor nodes sense some environmental phenomena and send data packets about the phenomena to the sink node by multi-hop communications. Generally sensor nodes are battery-driven. Therefore shortening...
This paper demonstrates how micromechanical on-chip MEMS resonators can be used as higher-order mixer-filters in RF front-end WSN nodes. Vibrating FFSFRs (Free-free Square Frame Resonator) connected together can create 4th and 6th order mixer-filter responses. The output is further enhanced by an on-chip amplifier, thus reducing stray capacitances. These mixer-filters are fabricated utilizing a CMOS-MEMS...
The challenges associated with wireless vision sensor networks are low energy consumption, less bandwidth and limited processing capabilities. In order to meet these challenges different approaches are proposed. Research in wireless vision sensor networks has been focused on two different assumptions, first is sending all data to the central base station without local processing, second approach is...
Ultra-low power SRAM is a promising memory for the next-generation electronics that focus on green and power-aware computing. Unfortunately, ultra-low power SRAM encounters serious timing uncertainty. One of the major problems is that the conventional voltage-clamping circuits cannot work when the bitlines have serious with-in-die variations. The full swing, usually required on the bitline, causes...
Wireless Personal Area Networks (WPANs) are getting popular in a variety of fields such as home/office automation, e-healthcare, etc. In WPANs, most devices are considerably energy constrained, so the communication protocol should be energy efficient. The IEEE 802.15.4 is designed as a standard protocol for low power, low data rate, low complexity and short range connections in WPANs. The standard...
A robust distributed estimation scheme for fusion center in the presence of sensor faults via collaborative sensor fault detection (CSFD) was proposed in our previous research [9]. The scheme can identify the faulty nodes efficiently and improve the accuracy of the estimates significantly. It achieves very good performance at the expense of such extensive computations as logarithm and division in...
This paper presents a transmitter design for Ultra Wideband Impulse Radio (UWB-IR) communications. The design is targeted towards the implementation of passive Wireless Sensor Tags (WST) where micro-power consumption is required. The transmitter has been implemented in UMC 0.18μm CMOS and placed inside a QFN lead-less package. It complies with the FCC regulations for Pulse Rate Frequencies (PRF) up...
The development of a wireless handheld terminal for indoor gas concentration detection is presented in this paper. The major motivation for this work is to develop a distributed wireless measuring system suitable for metal-oxide semiconductor gas sensors, usually with a wide range resistance (e.g. 0~100 MΩ), for indoor gas concentration detection. The handheld data acquisition terminal is developed...
The article proposes a new type of short-range wireless information transmission equipment. It is mainly composed of a transmitter and a receiver. The transmitter and the receiver all use the high integrated and high performance single chip solution. The transmitter is only composed of pure hardware. It features simple structure, stable performance and simple debugging. The receiver not only has simple...
In view of low level of greenhouse automatic control system in China at present, this paper introduces a agriculture greenhouse environment monitoring system based on ZigBee technology, then gives the overall design of physical structure of system, network topology and its hardware and software designed of the composed modules. The PC software develop with Visual C++6.0 and SQL Server2000 that provides...
In order to balance power usage in heterogeneous sensor networks, the LBGC (Load balancing group clustering) strategy is proposed based on the clustering model. The LBGC protocol periodically selects cluster heads and implements dynamic route calculation according to the condition of energy distributing of network, which could make full use of the heterogeneous energy to realize load balance. Simulation...
Currently in China the level of coal mine roadway roof abscission layer monitoring is low, especially in the most coal mine the transmission and observation of the underground separation data are by manual labor or by cable transmission, there is a high cost for coal mine. This paper introduces a roof abscission layer monitoring system based on ZigBee which is adapting to environment of coal mine...
In this paper, taking mobile robot as the research object, the embedded control system is designed adopting PC/104 as host controller, which achieves the link among the expand boards, power module, motor driving module, perception modules, the HCI interface modules and so on; Wireless communication technology in mobile robots is investigated deeply, and then wireless remote control and wireless serial...
The recent interest in Wireless Sensor Networks has led to a number of clustering algorithms that use the limited energy available at sensors more efficiently. In this article, we present a heritable clustering algorithm based on HEED for low energy wireless sensor network. It brings in appointment mechanism to reduce the cluster head reelect overhead efficiently. In the cluster, TDMA communication...
This paper concerns a robot system fit for detecting mine disaster information on the basis of the working principle of detecting robot system. It introduces in details the structure of the system; the technologies of passing through obstacles, obstacles avoidance by using sensors; the collection of information and wireless transmission modules, including gas sensors, temperature sensors, network...
This paper studies the design of hardware system and implementation of program algorithm for emotion robot, then focuses on the specific of wireless communication subsystem and related key technique.
This paper mainly studies the application of synchronous lifting technology in the bridge lifting. The wireless sensor network is installed in the bridge to serve as low-cost alternatives to commercially available cable-based measuring and monitoring systems. Due to the unavoidable sensing noises and the uncertain perturbations in the hydraulic systems, Kalman filter is adopted to reduce the measuring...
In this paper we are proposing an efficient secure solution to the data centric routing protocol One Phase Pull diffusion which permit multi-hop routing of sensed data. SecOPP provides both Group and Pairwise key distribution with the possibility of rekeying as well as security services: integrity, authentication and confidentiality of exchanged messages. All these are obtained without using a key...
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