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中南大学学报(英文版)

Journal of Central South University

Vol. 18    No. 2    February 2011

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Adaptive resource allocation for multi-user multi-server power-line communication OFDM systems
XU Zhi-qiang(徐志强)1, ZHAI Ming-yue(翟明岳)2, CUI Xiang(崔翔)2, ZHAO Yu-ming(赵宇明)3

1. Hunan Electric Power Test and Research Institute, Changsha 410007, China;
2. Department of Electric and Electron Engineering, North China Electric Power University, Beijing 102206, China;
3. Technology Research Center of China Southern Power Grid, Guangzhou 510000, China

Abstract:The bits and power allocation model of adaptive power-rate mixture for multi-user multi-server power-line communication systems was analyzed with the restrictions of maximal total power, fixed rate for each real time (RT) user, minimal rate for each non-real time (NRT) user, maximal bits and power for each subcarrier in each orthogonal frequency division multiplexing (OFDM) symbol. An algorithm of resource dynamic allocation in the first OFDM symbol of each frame and resource optimal adjustment in the latter OFDM symbol of each frame was proposed. In the first OFDM symbol of every frame, resource is firstly assigned for RT users so as to minimize their total used power until satisfying their fixed rates; secondly the remainder resource of power and subcarriers are assigned for NRT users so as to minimize their total used power until satisfying their minimal rates also; lastly the remainder resource is again assigned for NRT users according to the proportional fairness strategy so as to maximize their total assigning rate. In the latter OFDM symbol of each frame, bits are swapped and power is adjusted for every user based on the resource allocation results of anterior OFDM symbol. The algorithm is tested in the typical power-line channel scenarios and the simulation results indicate that the proposed algorithm has better performances than the classical multi-user resource allocation algorithms and it realizes the multiple aims of multi-user multi-server resource allocation for power-line communication systems.

 

Key words: power-line communications; adaptive orthogonal frequency division multiplexing; resource allocation; user priority; swap adjustment

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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