Adaptive resource allocation for multi-user multi-server power-line communication OFDM systems |
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Authors: | XU Zhi-qiang ZHAI Ming-yue CUI Xiang ZHAO Yu-ming |
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Affiliation: | (1) Department of Electrical Engineering, National Chiao Tung University, Hsinchu, 300, Taiwan, ROC |
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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. |
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Keywords: | power-line communications adaptive orthogonal frequency division multiplexing resource allocation user priority swap adjustment |
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