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In this paper, energy efficient transmit antenna selection in underlay cognitive radio (CR) multiple-input multiple-output (MIMO) systems from a cross layer perspective, is investigated. Conventional energy efficient antenna selection optimizes an energy efficiency (EE) metric defined in terms of the system capacity and energy consumption, making it a physical layer criterion. In this work, we propose...
Spectrum efficiency (SE) and energy efficiency (EE) are two key targets in wireless communication networks. Applying energy harvesting technology to cognitive radio networks (CRNs), which is called RF-powered CRNs, provides an effective method to improve both SE and EE of CRNs. In conventional RF-powered CRNs, secondary transmitters (STs) equipped with RF energy harvesting capability opportunistically...
Spectrum scarcity together with high capacity demands make the use of millimeter wave (mmWave) frequencies an interesting alternative for next generation, i.e., fifth generation (5G), networks. Although mmWave is expected to play a key role for both access network and backhaul (BH), its initial use in the BH network seems more straight-forward. This stems from the fact that, in the BH case, its deployment...
Nowadays telecommunication systems consume a huge amount of energy. While energy efficiency methods have already been studied for linear antennas, this paper focuses on 2D antenna arrays. An antenna array with many elements gives the network operator a high degree of flexibility in network optimization, which can be used not only for improving the quality of service, but also for increasing the energy...
This paper has proposed an adaptive antenna selection technique in multiple input multiple output (MIMO) system that optimizes the system energy efficiency to achieve maximum throughput. Though throughput increases with the dimension of MIMO system, the energy consumed per RF module is a major concern. The antenna selection technique exploits the channel state information (CSI) at transmitting end...
In this paper, we analyze the performance of a dense small cell network with multi-antenna Base Station (BS)s employing spatial Poisson Point Process (PPP) model. In this model, the BSs and User Equipment (UE)s are distributed as two independent PPPs which are well appropriate for upcoming small cells in the next generation of wireless systems. We consider the scenario in which the small cell BSs...
In this paper, we propose a hybrid cellular network structure where co-frequency vertical coverage embedded on the cell edge, to improve the performance in the cell edge, using the cell interference depth as the interference threshold. Based on this proposed structure, three key performance metrics, i.e., the spectral efficiency, the cell throughput and the energy efficiency, are analyzed. The results...
Energy consumption in mobile networks, e.g. 3G networks, may be a substantial part of an operator's expenses. A large part of the total energy of the network is consumed by the radio access network. Today operators are saving energy by turning off carriers or cells during periods with low traffic by manually configuring on-off periods. At the same time, operators are seeking to increase cost efficiency...
Feedback information provides a leverage for improving the system performance of wireless communication systems. This paper investigates the effects that feedback information in terms of Channel Quality Information (CQI), Precoding Matrix Indicator (PMI) and Rank Indicator (RI) have on the energy efficiency of two popular Multiple Input Multiple Output (MIMO) transmission modes; Open Loop Spatial...
The demand for higher data rates in wireless communication systems has become inevitable with the availability of diverse range of multimedia applications in mobile communications today. Multiple Input Multiple Output (MIMO) antennas is one of the technologies utilized to support the required higher data rates in wireless communications. However, energy efficiency in cellular communications has generated...
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