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Energy efficiency (EE) is a key metric in future green wireless networks. In this paper, we study the secure simultaneous wireless information and power transfer (SWIPT) in a downlink multiple-input-single-output (MISO) system, where the energy efficiency (EE) of the system is guaranteed. By jointly designing the transmit beamforming (BF), artificial noise (AN) and power splitting (PS) ratio, the...
Beamforming has the potential to improve the efficiency of simultaneous wireless information and power transfer (SWIPT) systems. Existing beamforming techniques have been focused on the downlink of SWIPT systems. In this paper, we optimize the beamformers and transmit duration to maximize the weighted sum rate of both the downlink and uplink in a multiuser multiple-input multiple-output (MIMO) SWIPT...
This paper studies energy efficient power and subchannel allocation in dense small cell networks. After giving the subchannel allocation algorithm, we transform the fractional energy efficient problem into an equivalent iterative optimization problem which has a subtractive form. With the developed utility function of the equivalent problem, we introduce a non-cooperative game to optimize power allocation...
In macro and Closed Subscriber Group (CSG) femtocells co-channel deployment, femtocells and Macrocell User Equipments (MUEs) suffer strong interference from neighboring femtocells. The interference seriously degrades MUEs' throughput performance or even causes outage. To solve this issue, we provide a centralized component carrier selection scheme. By globally optimizing femtocells' and MUEs' component...
In co-channel deployment of macrocell and indoor femtocells, almost blank subframe (ABS) is considered as an effective enhanced inter-cell interference coordination strategy for mitigating downlink cross-tier interference. In this paper, a novel distributed dynamic ABS ratio setting scheme is proposed for dense residential femtocell deployment with closed subscriber group configuration. Both the overall...
The discontinuous reception (DRX) mechanism is adopted by the Third Generation Partner Project (3GPP) Long Term Evolution (LTE) as a promising technology to extend the user equipment's (UE's) battery lifetime. From our simulation, it can be found that the decrease in power consumption resulted from LTE DRX is always at the price of deteriorated system utility. Thus, this paper focuses on the design...
A new cross-layer urgent bit first (CLUBF) scheduling mechanism is proposed and analyzed in the paper. The proposed algorithm focuses on cross-layer resource allocation scheme for heterogeneous services in orthogonal frequency division multiplexing access (OFDMA) downlink systems. And the CLUBF scheduling mechanism is operated over four steps: (1) traffic mapping: dividing traffic into UB (urgent...
Long-term evolution (LTE) of the UMTS terrestrial radio access and radio access network is considered to ensure the competitiveness of 3GPP radio-access technology in a longer time frame. To minimize/optimize the user equipment (UE) power consumption, and further to support various services and large amount of data transmissions, a discontinuous reception (DRX) mechanism with adjustable DRX cycles...
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