Journal
IEEE COMMUNICATIONS LETTERS
Volume 17, Issue 3, Pages 471-474Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LCOMM.2013.012313.122159
Keywords
Cooperative communication; resource allocation; decode and forward; OFDM; energy efficiency; convex optimization
Categories
Funding
- The Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- IAP project BESTCOM
- ARC SCOOP
- NEWCOM#
- NSF China [61271213]
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This paper develops a sum-power minimized resource allocation (RA) algorithm subject to a sum-rate constraint for cooperative orthogonal frequency division modulation (OFDM) transmission with subcarrier-pair based opportunistic decode-and-forward (DF) relaying. The improved DF protocol first proposed in [1] is used with optimized subcarrier pairing. Instrumental to the RA algorithm design is appropriate definition of variables to represent source/relay power allocation, subcarrier pairing and transmission-mode selection elegantly, so that after continuous relaxation, the dual method and the Hungarian algorithm can be used to find an (at least approximately) optimum RA with polynomial complexity. Moreover, the bisection method is used to speed up the search of the optimum Lagrange multiplier for the dual method. Numerical results are shown to illustrate the power-reduction benefit of the improved DF protocol with optimized subcarrier pairing.
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