Downlink Subchannel and Power Allocation in Multi-Cell OFDMA Cognitive Radio Networks

作者：Choi Kae Won^*; Hossain Ekram; Kim Dong In

来源：IEEE Transactions on Wireless Communications, 2011, 10(7): 2259-2271.

DOI：10.1109/TWC.2011.051311.101191

• Cognitive radio (CR)
• opportunistic spectrum access
• orthogonal frequency-division multiple access (OFDMA)
• multi-cell systems
• subchannel allocation
• optimization
• dual decomposition

We propose a novel subchannel and transmission power allocation scheme for multi-cell orthogonal frequency-division multiple access (OFDMA) networks with cognitive radio (CR) functionality. The multi-cell CR-OFDMA network not only has to control the interference to the primary users (PUs) but also has to coordinate inter-cell interference in itself. The proposed scheme allocates the subchannels to the cells in a way to maximize the system capacity, while at the same time limiting the transmission power on the subchannels on which the PUs are active. We formulate this joint subchannel and transmission power allocation problem as an optimization problem. To efficiently solve the problem, we divide it into multiple subproblems by using the dual decomposition method, and present the algorithms to solve these subproblems. The resulting scheme efficiently allocates the subchannels and the transmission power in a distributed way. The simulation results show that the proposed scheme provides significant improvement over the traditional fixed subchannel allocation scheme in terms of system throughput.

• 出版日期2011-7