Penn State College of Communications

About: Penn State College of Communications is a based out in . It is known for research contribution in the topics: Relay & Cognitive radio. The organization has 2106 authors who have published 2119 publications receiving 24693 citations.

Bandwidth enhanced dual-band patch-coupling microstrip antenna with omnidirectional CP and unidirectional CP characteristics

Abstract: Patch-coupling method is adopted to broaden the bandwidth of one dual-band dual-mode dual-circular polarisation (DBDMDCP) circular microstrip antenna in this paper. The function of dual-band dual-mode (DBDM) is excited by simplified metamaterial structure. Curved branches loaded on the ground plane and slots perturbation of radiating patches are used to excite the circular polarisation (CP) property for both n = 0 omnidirectional mode and n = 1 mode unidirectional mode, respectively. By loading four parasitical coplanar coupling patches on the top surface, the impedance of the patch mode is obviously broadened. Furthermore, methods of coplanar coupling and cascade coupling with circular patches are both adopted to broaden the axial ratio (AR) bandwidth maintaining the impedance matching condition. Considering the processing precision, the cascade coupling type is finally fabricated and compared with the probe-fed type for verification. Measurement results show that impedance bandwidths of 4% (centered at 4.52 GHz) and 17% (centered at 5.89 GHz) with maximum gain of 1.0 dBic and 7.1 dBic are realised for the dipole mode and patch mode, respectively. Furthermore, the 3 dB axial ratio (AR) bandwidth of the patch mode is 9.2% (520 MHz centered at 5.66 GHz). Compared with the former designs, this one owns simpler structure, considerable bandwidth besides of pattern and polarisation diversity.

3D Deployment of Multi-UAV for Energy-Saving: A Game-Based Learning Approach

Abstract: In this paper, we investigate the problem of three-dimensional (3D) coverage deployment of unmanned aerial vehicles (UAVs). The downlink scenario of air-to-ground communication networks is considered, where UAVs are supposed to maximize the coverage utility of mission area with minimal transmission power. We decompose the problem into two sub-problems, which are UAV deployment and power allocation, respectively. In the first sub-problem, we adjust the 3D locations of UAVs to maximize the coverage utility. In the second sub-problem, we adjust the transmission power to maximize the energy efficiency. By constructing marginal utility function, we prove that these two problems are exact potential games (EPG) and exist Nash equilibrium (NE) points. After that, an algorithm based on binary log-linear learning is proposed to achieve the NE point. The simulation results verify the efficiency of the algorithm and the stability of the model.

WiSal: Ubiquitous WiFi-Based Device-Free Passive Subarea Localization without Intensive Site-Survey

Abstract: WiFi-based device-free passive localization is an emerging technique and holds great potentials to ubiquitous location-based service and security-critical applications. Recently, channel state information (CSI) can be expediently extracted from commercial WiFi NICs, which offers a chance for fine-grained and high-accuracy device-free passive localization. Current device-free passive localization systems either rely on deploying specialized systems with dense transmitter-receiver links with high economic cost or elaborating intensive training process with high labor cost. In this study, we explore the possibility of a ubiquitous WiFi-based device-free passive subarea localization(WiSal) via physical-layer channel response features without intensive site-survey based on a single link at the expense of some localization accuracy. The location of human can be estimated by leveraging K-Nearest Neighbor(KNN) algorithm based on signal change features of different subareas that are achieved by a hierarchical clustering algorithm. WiSal can greatly reduce the cost of site survey on manpower and time, and meet requirements of numerous applications. Extensive experiments illustrate that our scheme can achieve great performance in terms of localization accuracy under a single link.

Fast automatic link establishment: A new metric and the value of spectrum prediction

Abstract: Automatic link establishment (ALE) is one of the important technologies in HF communication. One of the indicators to measure the performance of an ALE system is the linking time, which includes channel switching, spectrum sensing, and trying to call three periods. Asynchronous mode has been widely used for its simple operation. When establishing an link, the station sorts all the channels and selects the best available channel based on link quality analysis (LQA) matrix, which consists of scores of channels. The traditional LQA algorithm only considers a single factor, such as SNR. In this paper, a new LQA matrix combined with spectrum prediction is proposed to reduce the linking time. It is a new metric to evaluate channels. Spectrum prediction technology has been developed in order to solve the problem of time and energy consumption of spectrum sensing. Based on previous occupancy information, the statistical state parameters of each channel can be obtained. Compared with the traditional algorithm, the new algorithm balances channel state and quality parameters with multiplicative relation. The simulation results show that the linking time is reduced and the performance is improved using new algorithm, and the spectrum prediction can further reduce linking time.

Application of Solar Photovoltaic Power Generation System in Maritime Vessels and Development of Maritime Tourism

Abstract: Abstract The use of new energy generation technologies such as solar energy and electric propulsion technologies to form integrated power propulsion technology for ships has become one of the most concerned green technologies on ships. Based on the introduction of the principles and usage patterns of solar photovoltaic systems, the application characteristics of solar photovoltaic systems and their components in ships are analyzed. The important characteristics of the marine power grid based on solar photovoltaic systems are explored and summarized, providing a basis for future system design and application. Photovoltaic solar cells are made using semiconductor effects that convert solar radiation directly into electrical energy. Several such battery devices are packaged into photovoltaic solar cell modules, and several components are combined into a certain power photovoltaic array according to actual needs, and are matched with devices such as energy storage, measurement, and control to form a photovoltaic power generation system. This article refers to the basic principle and composition of the land-use solar photovoltaic system, and analyzes the difference between the operational mode and the land use of the large-scale ocean-going ship solar photovoltaic system. Specific analysis of large-scale ocean-going ship solar photovoltaic system complete set of technical route, for the construction of marine solar photovoltaic system to provide design ideas.