Journal
IEEE COMMUNICATIONS LETTERS
Volume 17, Issue 10, Pages 1944-1947Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LCOMM.2013.082613.131487
Keywords
Cooperative network; energy-efficiency; subcarrier allocation; power allocation
Categories
Funding
- National Natural Science Foundation of China [61171105]
- Program for New Century Excellent Talents in University [NCET-11-0598]
- National Science and Technology Major Project of the Ministry of Science and Technology [2012ZX03001030-004]
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This letter addresses the joint subcarrier and power allocation problem in downlink multiuser OFDM cooperative networks. The sum of the logarithmic per user time-averaged bits-per-Joule is maximized. The optimization problem is decomposed into two subproblems. First, the solution for the subcarrier allocation considering the proportional fairness is obtained. Second, an alternating power allocation (PA) scheme with separate transmit power constraints at the source and relays is derived under frequency selective fading channels. Then the complexity of the proposed scheme is analyzed. Finally, numerical results present the convergence, energy efficiency and outage probability performance of the proposed scheme.
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