1,401 research outputs found
Simulation Platform for Wireless Sensor Networks Based on Impulse Radio Ultra Wide Band
Impulse Radio Ultra Wide Band (IR-UWB) is a promising technology to address
Wireless Sensor Network (WSN) constraints. However, existing network simulation
tools do not provide a complete WSN simulation architecture, with the IR-UWB
specificities at the PHYsical (PHY) and the Medium Access Control (MAC) layers.
In this paper, we propose a WSN simulation architecture based on the IR-UWB
technique. At the PHY layer, we take into account the pulse collision by
dealing with the pulse propagation delay. We also modelled MAC protocols
specific to IRUWB, for WSN applications. To completely fit the WSN simulation
requirements, we propose a generic and reusable sensor and sensing channel
model. Most of the WSN application performances can be evaluated thanks to the
proposed simulation architecture. The proposed models are implemented on a
scalable and well known network simulator: Global Mobile Information System
Simulator (GloMoSim). However, they can be reused for all other packet based
simulation platforms
Medium Access Control for Wireless Sensor Networks based on Impulse Radio Ultra Wideband
This paper describes a detailed performance evaluation of distributed Medium
Access Control (MAC) protocols for Wireless Sensor Networks based on Impulse
Radio Ultra Wideband (IR-UWB) Physical layer (PHY). Two main classes of Medium
Access Control protocol have been considered: Slotted and UnSlotted with
reliability. The reliability is based on Automatic Repeat ReQuest (ARQ). The
performance evaluation is performed using a complete Wireless Sensor Networks
(WSN) simulator built on the Global Mobile Information System Simulator
(GloMoSim). The optimal operating parameters are first discussed for IR-UWB in
terms of slot size, retransmission delay and the number of retransmission, then
a comparison between IR-UWB and other transmission techniques in terms of
reliability latency and power efficiency
BCB Based Packaging for Low Actuation Voltage RF MEMS Devices
This paper outlines the issues related to RF MEMS packaging and low actuation
voltage. An original approach is presented concerning the modeling of
capacitive contacts using multiphysics simulation and advanced
characterization. A similar approach is used concerning packaging development
where multi-physics simulations are used to optimize the process. A devoted
package architecture is proposed featuring very low loss at microwave range
Channel Capacity Limitations versus Hardware Implementation for UWB Impulse Radio Communications
Starting from the Shannon channel capacity, we propose an IR-UWB channel
capacity based on the delay spread for multipath time variant channels. This
IR-UWB channel capacity is obtained from the no ISI (Inter Symbol Interference)
assumption and for binary modulations. The impact of the kind of implementation
is considered on the IR-UWB channel capacity. This study is lead for mixed and
mostly digital implementation. The key parameters and theirs impacts on the
channel capacity are exposed in each case: the data converters for mostly
digital implementations and the pulse generator capabilities for mixed
implementations. Finally, these two implementations are compared from a data
rate point of view. Their behaviors regarding an increase of the operating
frequency are also studied
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