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In this paper we consider the issue of localization in the context of underwater sensor networks which contain anchor nodes with perfect knowledge of their position, but asynchronous clocks. By taking advantage of a sequential broadcasting protocol the entire network can be localized simultaneously with minimal overhead. Additionally, it can be initiated by any node at any time. Through extensive...
The measuring of elastic modulus based on ultrasonic is the key to improve the propagation time measurement accuracy. In addition to the use of advanced equipment and software algorithms, the error of measurement time caused by the acoustic coupler interface can be completely avoided by use of step-axis specimen. Using time interval between primary and secondary pulses can effectively eliminate the...
We present results of a polarization diverse LCoS wavelength processor. Applications include impairment simulation of broadband, channelized and intra-band PMD and PDL for detailed experimental sensitivity analysis in dual-polarization coherent transmission.
Real-time applications such as multimedia applications have high requirements on bandwidth, delay, jitter etc, which requires WMN (Wireless Mesh Networks) to support QoS. QoS routing is crucial to provide QoS. This paper focuses on QoS routing with bandwidth constraint in multi-radio multi-channel WMN, and proposes a new multi-metric and a QoS routing protocol MMQR. The routing metric has two advantages...
In multihop wireless networks each node is equipped with multiple radio interfaces, and multiple channels are available for communication. One of the major problems in such networks is the capacity reduction due to the interference among multiple simultaneous transmissions. In order to effectively minimize interference, this paper proposes a QoS routing protocol CATR based on channel assignment and...
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