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The Application Technology Research in the Wireless Sensor Network

Author: RenXiaoFeng
Tutor: LiJianXin
School: PLA Information Engineering University
Course: Communication and Information System
Keywords: Wireless sensor networks Hardware system Low power consumption DCF
CLC: TN929.5
Type: Master's thesis
Year: 2008
Downloads: 112
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Abstract


The wireless sensor network is a new type of wireless network infrastructure, to form a multi-hop self-organizing network systems, real-time collaboration to perceive information and the acquisition of a variety of environmental or sensing object is composed of a large number of sensor nodes through wireless communication. and processed, and transmitted to the user in need of such information. Potentially significant value in the military and national defense, agricultural and industrial control, medical, environmental monitoring, home care and many other areas, causing widespread concern of national governments and research institutions. Wireless sensor hardware system constitutes a brief overview and in-depth analysis of each module of the node features and performance requirements, a detailed description of the general scheme of the node hardware platform design, circuit schematic and functional modules working principle, and shows a flowchart of the operation of the system software, and nRF2401 transceiver mode program design. Secondly, the sensor node application environment and the working characteristics of the sensor network node must be on the low-power design. This case, paper in System IC system low-power technology principle and design method based on the design of each module of the node low-power processing solutions and a quantitative analysis of the program. In addition, based on two-dimensional Markov chain model of IEEE 802.11 DCF in saturation delay characteristics, given the distributed coordination function (DCF) method of theoretical analysis in the packet transmission delay, and use NS2 simulation software simulation basic access and RTS / CTS way two transmission delay performance comparative analysis of simulation results further validate the effectiveness of the theoretical analysis method for the study of the transmission of real-time business in the wireless LAN provides a theoretical basis. Finally, in order to make efficient use of the wireless sensor network energy around the data link layer MAC protocol in wireless sensor networks to expand the design. For the S-MAC protocol for the heavy and dense nodes when performance is poor, transmission packet collision is high, an increase in the number of retransmission packet, the network consume more energy, resulting in wireless sensor network is not efficient energy use, so the author general S-MAC protocol backoff algorithm based on improvements proposed a new MAC protocol, the basic idea is adaptive backoff algorithm to the energy minimum guidelines to adjust the packet transmission probability p, simulation results show that the improved protocol has better The energy performance.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Mobile Communications
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