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Analyzing the Energy Consumption of Error Control Mechanisms in Wireless Sensor Networks

Khodadoustan, Safieh | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 40294 (52)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Beigy, Hamid
  7. Abstract:
  8. Nowadays wireless technology is widespread all over the world, because of extensive and successful application of low cost, low power, multifunctional tiny sensor nodes that can be grouped to make up of a wireless sensor network (WSN). Some of Wireless sensor network technologies include Zigbee, EnOcean, Personal area network, Ultra-Wideband and Bluetooth which this thesis focuses on the last one. Scalability, mobility, reliability and energy efficiency are some of the requirements and challenges of WSNs, which among them reliability and reducing energy consumption are two important objectives in wireless sensor networks. Since each sensor node has limited energy to consume, overcoming the energy constraints is the most significant challenge in sensor networks. Due to the vulnerability of data transmission over a wireless media and the importance of the correctness of packets, error control schemes are necessary. Although high bit error rates are common aspects of a wireless channel, some techniques such as automatic repeat request (ARQ) and forward error correction (FEC) can be employed to improve the reliability of data transmission. Nevertheless, the energy consumed by these coded schemes cause to increase the energy consumption due to the transmission of redundant bits. Although Reliability and energy consumption are the most important concerns for emerging technologies, unfortunately it has been observed that they have contra-variant relationship- an application that requires more reliability consumes more energy. Indeed, these two concerns are at odds so that there is a trade –off between them. In fact, this thesis focuses on the trade-off between these two concerns for Bluetooth packets. We aim to analyze some custom error control mechanisms in terms of energy efficiency to have a comparison between them. For this purpose an analytical model is developed to evaluate the energy efficiency in Rayleigh fading channels. For this objective, a literature review is conducted, a detailed comparative analysis of error-control schemes is provided and a new approach which is involved with computation of residual error probability is presented. It is also worth noting that none of the previous works on Bluetooth sensor networks consider residual error probability in their computations so far. For the simulation purpose we have developed some MATLAB and Java codes. Performance results are obtained taking into consideration different number of hops and average received signal to noise ratio (SNR), and the future works are mentioned. We believe such a comparative analysis presents information that help network designers to choose suitable error control mechanisms and packet type depending on network situation.
  9. Keywords:
  10. Wireless Sensor Network ; Reliability ; Bluetooth Thechnology ; Energy Efficiency ; Error Control Scheme

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