WiSeR Emulator: An Advanced Emulator for Sensor Network

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WiSeR Emulator An Advanced Emulator for Sensor
Network

• Rajat Khanda

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Outline

• Introduction
• Goal of the Project
• Motivation
• Approach
• Work Flow
• Implementation

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Introduction

• Application of Sensor Network
• Military
• Civil Structure Health Monitoring
• Inventory Management
• Wild Life Habitat Monitoring
• Simulator and Emulator

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Goal of the Project

• Design of an Emulator which is scalable, more
  accurate to domain specific applications
• Focus is on designing the platform for studying
  structural Health Related Problems(Location of
  the fault, sensor coverage of the structure)
• Can be further extended by adding other domain
  specific modules
• Can be configured for RSSI measurement related
  experiments
• GUI for configuring the experiment and display

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Motivation

• Emergence of Sensor Network and Design issues for
  the Network designer
• Emulators available for Wireless Networks(802.11)
  ( CMU Emulab, ONE) to develop and test
  applications but not for WSN
• WSN emulator Atemu (University of Maryland) and
  VMnet both emulate the mote but dont have a
  feature for emulating sensing experiment
• To bring together wireless and sensing part in
  Emulator

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Approach

• Use a model of wave propagation inside concrete
  structure
• Emulate the signal at the receiver using the
  model and input parameters from the user
• Regenerate the analog signal using a high speed
  multichannel Digital to Analog Converter
• Use the testbed motes for transmission and
  reception

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Work Flow

• User input (path property, location of the node,
  location of crack ) will be taken through GUI
• According to this input, samples for receiver
  signal will be generated using signal propagation
  model inside structures.
• For multi-node experiment the processed data for
  individual node will be sent to NI-9264 for
  generating analog signal in multichannel
  simultaneously
• These signals will be given to the analog input
  pin of the receiver nodes

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Work Flow

• The nodes will process the analog signal
  (digitize, compress, timestamp) and send it to a
  base station
• Base station will pass the necessary information
  to the PC via USB.
• Received data will be displayed using GUI

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Implementation

• Programmed the high speed Digital to Analog
  Converter (NI 9264) to generate analog signals
  simultaneously in 16 channels from stored
  digital data
• Implemented signal processing modules for
  threshold, quantization, wavelet and LZ77
  encoding on tinyos
• Fed the DAC generated signal to mote, used ADC
  module (Wiser Group Amit Pendharkar) to sample
  the data and transmitted the digital samples to a
  base station
• Base station transferred the received data to PC
  via USB and the acquired data is displayed using
  GUI

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Questions?
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Thank You