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We consider a heterogeneous network (HetNet) containing primary users (PUs) and secondary users (SUs). Ordinary cellular users are characterized as PUs, while SUs are the unlicensed users, sensors, or some other Internet of Things equipments. The PUs occupy all the channels in the HetNet and the SUs try to reuse the channels of PUs. We consider two transmission modes for SUs, i.e., the SU can associate...
Energy-efficient resource allocation is investigated for multi-pair massive MIMO amplify-and-forward relay systems, where a dedicated relay assists pairwise information exchange among many pieces of single-antenna user equipment (UE). The system energy efficiency (EE) is theoretically analyzed by employing large system analysis and random matrix theory. This analytical result provides excellent approximation...
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