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In this paper, we address the problem of energy-efficient power allocation for secure communications in wireless powered relaying systems. The advantages of a massive multiple-input multiple-output (M-MIMO) relay are explored to improve the energy efficiency of both wireless information and power transfer. We first give a detailed performance analysis, and obtain a closed-form expression of the secrecy...
In this paper, we consider a large scale multiple input multiple output (LS-MIMO) relaying system, where an information source sends the message to its intended destination aided by an LS-MIMO relay, while a passive eavesdropper tries to intercept the information forwarded by the relay. The advantage of a large scale antenna array is exploited to improve spectral efficiency and enhance wireless security...
In this paper, we address the problem of energy-efficient power allocation for secure communications in an amplify-and-forward (AF) large-scale multiple-input multiple-output (LS-MIMO) relaying system in presence of a passive eavesdropper. The benefits of an AF LS-MIMO relay are exploited to significantly improve the secrecy performance, especially the secrecy energy efficiency (bit per Joule). We...
As the wireless access technology evovles to wider and wider bandwidth, orthogonal frequency division multiplex (OFDM) becomes the fundamental technology component to provide efficient data transmission. However, compared to code division multiplex access (CDMA), OFDM has no capability to mitigate the intercell interference though it can provide orthogonality among the intracell users. To build a...
A new carbon nanotube antenna for terahertz application is proposed. The antenna properties such as electrical field distributions, scattering parameters, standing wave ratio and two dimension directivity patterns are discussed. The proposed antenna arrays operate from 9.3 THz to 10.2 THz range, and main resonant frequency is 9.7 THz. The simulation results could be useful for the generation of THz...
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