A V-shaped cationic dye for nonlinear optical bioimaging

Packet-based clock synchronization protocols, such as IEEE 1588, depend on the quality of the timestamps taken at the reception and transmission of packets. As software-based timestamping generates large non-deterministic delays, Ethernet synchronization implementations have moved the timestamping closer to the physical layer. However, most wireless synchronization approaches are restricted to software timestamping due to the lack of hardware timestamping features. This paper1 presents a physical layer timestamping approach for IEEE 802.11b, which is able to generate timestamps with sub-100 picosecond accuracy. When synchronizing the clocks of two WLAN devices with the proposed approach, the measurements show that the system can reach synchronization accuracies below 1 ns even with standard crystal oscillators.

Clock synchronization in IEEE 802.11 wireless LANs using physical layer timestamps

Introducing the new paradigm of Social Dispersed Computing: Applications, Technologies and Challenges

Accurate smartphone indoor positioning using a WSN infrastructure and non-invasive audio for TDoA estimation

“Fly-By-Wireless” paradigm based on wireless connectivity in aircraft has the potential to improve efficiency and flexibility, while reducing weight, fuel consumption and maintenance costs. In this paper, first, the opportunities and challenges for wireless technologies in safety-critical avionics context are discussed. Then, the assessment of such technologies versus avionics requirements is provided in order to select the most appropriate one for a wireless aircraft application. As a result, the design of a Wireless Avionics Network based on Ultra WideBand technology is investigated, considering the issues of determinism, reliability and security.

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Fly-By-Wireless for next generation aircraft: Challenges and potential solutions

Wireless sensor networks are evolving from relatively undemanding applications to applications which have stronger requirements. The coordination of distributed entities and events requires time synchronization. Although a number of methods have been studied for WSNs, some applications require high precision time synchronization. Precision time synchronization enables a variety of extensions of applications. The IEEE 1588 precision time protocol (PTP) provides a standard method to synchronize devices in a network with sub-microsecond precision. This paper deals with precision time synchronization using IEEE 1588 over wireless sensor networks. Precision time synchronization using IEEE 1588 provides compatibility between heterogeneous systems in WSNs. This paper also presents experiments and performance evaluation of precision time synchronization in WSNs. Our result established a method for nodes in a network to maintain their clocks to within a 200 nanosecond offset from the reference clock of a master node.

Precision Time Synchronization Using IEEE 1588 for Wireless Sensor Networks

Two-photon absorption properties of 1,4-bis{4′-[N,N-bis(6′′-trimethylammoniumhexyl)amino]styryl}benzene tetrabromide (C1) and its inclusion complexes (ICs) with cyclodextrins (CDs) have been studie

Bong Rae Cho

Papers

Precision Time Synchronization Using IEEE 1588 for Wireless Sensor Networks

Two-photon absorption properties of cationic 1,4-bis(styryl)benzene derivative and its inclusion complexes with cyclodextrins.