Journal
IEEE TRANSACTIONS ON COMMUNICATIONS
Volume 60, Issue 2, Pages 317-321Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCOMM.2011.102011.100277
Keywords
Two-way relaying; orthogonal frequency-division multiplexing (OFDM); subcarrier pairing; graph theory; maximum weighted bipartite matching (MWBM)
Funding
- National Natural Science Foundation of China [60902019, 61071079]
- Shanghai Municipal Education Commission [11ZZ19]
- Inter-Government Technology Collaborative Research Project of Shanghai [10220712000]
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Efficient utilization of radio resources in wireless networks is crucial and has been investigated extensively. This letter considers a wireless relay network where multiple user pairs conduct bidirectional communications via multiple relays based on orthogonal frequency-division multiplexing (OFDM) transmission. The joint optimization of channel and relay assignment, including subcarrier pairing, subcarrier allocation as well as relay selection, for total throughput maximization is formulated as a combinatorial optimization problem. Using a graph theoretical approach, we solve the problem optimally in polynomial time by transforming it into a maximum weighted bipartite matching (MWBM) problem. Simulation studies are carried out to evaluate the network total throughput versus transmit power per node and the number of relay nodes.
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