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We investigate the tradeoff between energy efficiency (EE) and spectrum efficiency (SE) in the heterogeneous network composed of a macro base station (BS), several pico BSs, and device-to-device (D2D) communication pairs during the uplink transmission. A utility function of the tradeoff between EE and SE is defined first. Then, we formulate the tradeoff utility maximization problem as a joint channel...
Femtocells and the device-to-device (D2D) communication can improve the system capacity in heterogeneous networks. To mitigate the interference caused by users in femtocells and improve the uplink capacity of femtocells, we investigate the users' uplink capacity maximization problem in D2D-enabled femtocells with channel allocation, mode selection and power control. Considering the rate requirement...
Channel allocation in cognitive radio networks completely determines the realizability and efficiency of cognitive radio since it is the final step before the cognitive subscribers can use the spectrum holes. In this paper, we consider channel allocation in cognitive radio networks as a resource allocation problem under the circumstance that the allocation of transmission rate, link and transmission...
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