Cooperative relay to improve diversity in cognitive radio networks
IEEE Communications Magazine
Cooperative diversity in wireless networks: Efficient protocols and outage behavior
IEEE Transactions on Information Theory
Spectrum pooling: an innovative strategy for the enhancement of spectrum efficiency
IEEE Communications Magazine
Cognitive radio: brain-empowered wireless communications
IEEE Journal on Selected Areas in Communications
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A cognitive OFDM-based relay network is considered in this paper. Communication between any node pair occurs on a spectrum pool of OFDM subcarriers where the subcarriers are not used by primary users. Therefore, the available spectrum for different transmitter-receiver pairs is distinct due to their location difference and so on. To satisfy different traffic demand and improve system performance, an adaptive unbalanced spectrum usage scheme is proposed. Moreover, to obtain the system maximum throughput, the optimal power allocation problem is formulated under the total power constraint based on the presented spectrum usage scheme. Simulation results show the proposed scheme is very effective.