Title page for etd-0807115-104934


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URN etd-0807115-104934
Author Jian-Xing Zhu
Author's Email Address No Public.
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Department Electrical Engineering
Year 2015
Semester 1
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Reducing Identification Time Using Dynamic Power Adjustment in RFID Systems
Date of Defense 2015-09-02
Page Count 81
Keyword
  • RFID
  • DPA
  • Abstract In a RFID system, how to avoid collisions among tags is an important factor to reduce reader’s identification time. From the survey of recent control methods, none of them could make reader amplify or reduce power to avoid the collisions. To solve the collision problem, we propose a Dynamic Power Adjustment (DPA) scheme for reader. The proposed DPA can reduce identification time by raising or lowering the transmission power of a reader. DPA uses TDMA frames to read tag’s identification code. There are three cases in a TDMA slot; the state of successfully reading identification number, the state of collision, and the state of idle. We calculate the factors of adjusting power based on the three states, and then compute the power differences from the factors to adjust power. Computing the power differences considers two aspects: one is if the number of idle state in a frame far exceeds the number of collision state, reader will be increased power to read more tags, another one is if the number of idle state in a frame is much smaller than the number of collision state, reader will be cut power to reduce the number of tag’s reading. Finally, we use NS-2 to simulate the proposed DPA. In the simulation. We design three different topologies which place tags in three distributions, even, random, and hot-spot, respectively. From the simulation results, we validate the proposed DPA by demonstrating that it takes much less time in completing the identification of all tags, particularly when tags are placed in hot-spot distribution.
    Key Words:RFID, Reader, Tag, DPA, TDMA, Frame, Slot, NS-2
    Advisory Committee
  • Chungnan Lee - chair
  • Zi-Tsan Chou - co-chair
  • Tsang-ling Sheu - advisor
  • Files
  • etd-0807115-104934.pdf
  • Indicate in-campus at 2 year and off-campus access at 4 year.
    Date of Submission 2015-09-07

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