Subcarrier Allocation for OFDMA Relay Networks with Proportional Fair Constraint

This paper considers subcarrier allocation for the multihop orthogonal frequency division multiple-access (OFDMA) broadcast networks consisting of one source, multiple destinations, and one amplify-and-forward (AF) relay. In this paper, proportional fair (PF) based subcarrier allocation is discussed to get a tradeoff between the system transmission rate and fairness. First, the problem is formulated as an optimization problem with prohibitive complexity. Second, by analyzing the optimal solution for the subcarrier allocation problem without PF constraint, two suboptimal schemes are proposed. The simulation results indicate that with the same fairness performance, the proposed schemes achieve considerable capacity gain compared with the conventional PF scheduling method which is extended simply from the single-hop system.

[1]  Shuyuan Yang,et al.  Optimally Joint Subcarrier Matching and Power Allocation in OFDM Multihop System , 2008, EURASIP J. Adv. Signal Process..

[2]  Wei Yu,et al.  Joint Optimization of Relay Strategies and Resource Allocations in Cooperative Cellular Networks , 2006 .

[3]  Guoqing Li,et al.  On the capacity of broadband relay networks , 2004, Conference Record of the Thirty-Eighth Asilomar Conference on Signals, Systems and Computers, 2004..

[4]  W. Mohr,et al.  Data rate estimates, range calculations and spectrum demand for new elements of systems beyond IMT-2000 , 2002, The 5th International Symposium on Wireless Personal Multimedia Communications.

[5]  Hui Liu,et al.  Resource Allocation for OFDMA Relay Networks With Fairness Constraints , 2006, IEEE Journal on Selected Areas in Communications.

[6]  Dong-Ho Cho,et al.  Fairness-Aware Adaptive Resource Allocation Scheme in Multihop OFDMA Systems , 2007, IEEE Communications Letters.

[7]  Wei Yu,et al.  Joint optimization of relay strategies and resource allocations in cooperative cellular networks , 2006, IEEE Journal on Selected Areas in Communications.

[8]  H. Vincent Poor,et al.  Resource Allocation for Wireless Fading Relay Channels: Max-Min Solution , 2007, IEEE Transactions on Information Theory.

[9]  Hoon Kim,et al.  A proportional fair scheduling for multicarrier transmission systems , 2004 .

[10]  Markus Herdin.  A Chunk Based OFDM Amplify-and-Forward Relaying Scheme for 4G Mobile Radio Systems , 2006, 2006 IEEE International Conference on Communications.

[11]  Gregory W. Wornell,et al.  Cooperative diversity in wireless networks: Efficient protocols and outage behavior , 2004, IEEE Transactions on Information Theory.