Title :
Optimal Channel and Relay Assignment in OFDM-Based Multi-Relay Multi-Pair Two-Way Communication Networks
Author :
Liu, Yuan ; Tao, Meixia
Author_Institution :
Dept. of Electron. Eng., Shanghai Jiao Tong Univ., Shanghai, China
fDate :
2/1/2012 12:00:00 AM
Abstract :
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.
Keywords :
OFDM modulation; channel allocation; combinatorial mathematics; optimisation; radio networks; OFDM-based multirelay multipair two-way communication networks; bidirectional communications; combinatorial optimization problem; maximum weighted bipartite matching problem; multiple user pairs; optimal channel assignment; orthogonal frequency-division multiplexing transmission; radio resource utilization; relay assignment; relay nodes; relay selection; subcarrier allocation; subcarrier pairing; throughput maximization; wireless relay network; Fading; Joints; OFDM; Optimization; Relays; Resource management; Throughput; Two-way relaying; graph theory; maximum weighted bipartite matching (MWBM); orthogonal frequency-division multiplexing (OFDM); subcarrier pairing;
Journal_Title :
Communications, IEEE Transactions on
DOI :
10.1109/TCOMM.2011.102011.100277
