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We consider the energy efficiency-aware user association problem in heterogeneous networks (HetNets). Since there is a large disparity between the transmit power levels of the macro and small cell base stations, the traditional downlink received signal strength indicator (RSSI) based user association results in extreme load imbalance and high uplink interference, which degrades the spectrum efficiency...
In this paper, we consider beamformer design of access and backhaul links in downlink cloud-RANs. An optimization problem is formulated with the objective of maximizing the weighted sum rate (WSR) under the constraints of power consumption, backhaul rate, as well as user grouping, which assumes each user is served by only one SBS to reduce the traffic load over the backhaul links. To solve this intractable...
In this paper, we consider the multicast beamforming problem in a downlink wireless system. Then, an optimization problem is formulated to find the optimal user-group assignment scheme and beamforming weight vectors, such that the number of admitted users is maximized with the minimum transmit power under the quality of service (QoS) requirement constraints of each individual user. Unfortunately,...
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