Title page for etd-0728109-164749


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URN etd-0728109-164749
Author Kuan-chou Lee
Author's Email Address No Public.
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Department Communications Engineering
Year 2008
Semester 2
Degree Master
Type of Document
Language English
Title Subcarrier Power Allocation for OFDM-Based Dual-Hop Systems with AF Relaying
Date of Defense 2009-07-24
Page Count 57
Keyword
  • amplify-and-forward
  • dual-hop
  • power allocation
  • OFDM
  • Abstract This thesis studies the subcarrier power allocation for the relayed signal in Orthogonal Frequency-Division Multiplexing (OFDM) based dual-hop system where the relay node operated in amplify-and-forward (AF) scheme. The investigated system assumes that each subcarrier at the source node transmits the signal with uniform power distribution.
    Considering the separated sum power constraints which the power constraint at source and relay node are uncorrelated, the conventional iterative water-filling algorithm can maximize the system capacity. However, it requires high computational complexity and the performance improvement is limited when the source node transmits the signal with uniform power distribution, subcarrier power allocation at relay node for capacity maximization is impractical.
    To further enhance the system performance, a novel subcarrier power allocation method is derived into a closed-form for the relayed signal to minimize the summation of equivalent noise power of the destination node. Comparing with the existing schemes, simulation results demonstrate that the proposed power scaling scheme significantly improves system average bit error rate (ABER).
    Advisory Committee
  • Chin-Liang Wang - chair
  • Chao-Kai Wen - co-chair
  • Char-Dir Chung - co-chair
  • Shyue-Win Wei - co-chair
  • Chih-Peng Li - advisor
  • Files
  • etd-0728109-164749.pdf
  • indicate accessible in a year
    Date of Submission 2009-07-28

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