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This paper proposes an energy-efficient multicast scheme for downlink orthogonal frequency division multiplexing (OFDM) system in which the base station (BS) is equipped with multiple antennas. We employ the multiple description coding multicast (MDCM) model and beamforming technique to maximize the energy efficiency (EE) with the constraint on total transmit power. In MDCM, the transmission rate...
This paper investigates the energy efficient resource allocation strategy for OFDM-based cognitive radio (CR) networks with imperfect spectrum sensing. The interference model taking the sensing errors into account is formulated at first. And the objective is to maximize the energy efficiency of the multiuser CR system subject to the total transmission power budget and each primary user's (PU) interference...
In this paper, the problem of resource allocation in heterogeneous cognitive radio networks is investigated under the constraints of interference temperature limit. The resource allocation problem is formulated as a mixed-integer programming problem and solved by Lagrangian dual method based on which a centralized subgradient update algorithm is proposed. The approximate optimality of this algorithm...
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