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In this paper, we proposed a composite structure spiral antenna whose working band covers the entire Ku band. The design of the antenna is the composite of equiangular spiral and Archimedes spiral: The internal of antenna element is with equiangular spiral, and the external of is with Archimedes spiral. So the size of antenna plane is reduced effectively. Furthermore, in order to suppress the back...
Arbitrarily polarized microwave power transmission technologies including polarization auto-matching retrodirective transmitting method and arbitrarily polarized microwave rectenna are proposed in this paper. The polarization auto-matching retrodirective transmitting method using phase conjugating circuits and polarization rotators can receive any polarized pilot signal and generate predictable polarized...
The intrinsic performance of the devices is of great meaning during power amplifiers design. A method to update de-embedding network at 5.8 GHz for packaged power devices is put forward based on physical modeling idea. The de-embedding network of a packaged GaN HEMT is presented and its errors are analyzed based on waveform engineering. The results may well lead to optimization of the de-embedding...
Many cyber attacks events have been occurring. Those are described so various points of views that redundancy of attack events information is increased. In this paper, to cope with the problems, we propose and develop attacker classification, attack-method classification, asset classification systems, as well as an ATM-schema that is an integrated schema of attacker's view, target(asset)'s view and...
Intelligent E-Commerce, which can provide personalized services to customers, is an inevitable tendency of future E-Commerce system. This paper introduces the methods of tracing user's browsing action and forecasting users' shopping action. In order to foresee user's shopping action, when user is applying for a web page at browser, the query string based on hierarchical product directory, which is...
Cloud-based Radio Access Network (C-RAN) could offer the benefit of mitigating inter-cell interference through facilitating cooperation techniques such as coordinated multi-point transmission (CoMP). This paper introduces the C-RAN architecture as well as different CoMP strategies to the multi-cell systems. Green advantages of C-RAN are presented and cooperation details of CoMP are analyzed. Simulations...
Energy efficiency and load balance of Wireless Sensor Network (WSN) is the key to ensure its extensive and reliable deployment, and the fundamental problem is about how to control the energy consumption of communication module on the WSN node. This paper attempts to analyze and solve problems on the perspective of how to design efficient and balanced data collection methods. The amount of data to...
This article derives a new sphere decoding algorithm based on the list sphere decoder(LSD), called improved multistage sphere decoding (IMSD) algorithm. The new algorithm divides the higher-order modulation into several stages of lower-order modulation, uses searching algorithm stage by stage, and defines a new adjustable coefficient r to decrease the effect of the misjudgment of lager weight stages...
Low-cost and accurate sensor localization estimation is an imperious requirement for the deployment of wireless sensor networks (WSNs) in a wide variety of applications. Multidimensional Scaling (MDS), one class of localization technique has been applied to location estimation and topology discovery. In case of large measurement errors, using Iterative Multidimensional Scaling (IT-MDS) can't get enough...
With the operation of the electric power network, the influence degree of stress, aging, deformation, bending and other factors on the reliability of the networks is found to have practical significance. The data of network status are large and independent, so we can correlate these independent data by means of subjective. In this paper, we combine the subjective weighting method and the objective...
The information capture of spatial node is the main application of mobile relaying Mesh Network. Due to the insufficiency of existing spatial query algorithm IWQE and EIWQE, this paper proposes an optimized spatial query algorithm EI2WQE based on neighbor transfer and redundancy recovery. It utilizes the broadcasting nature of wireless signal to receive neighbor node of the broadcasting signal. As...
A 24GHz microstrip phased array antennas with high gain and low side-lobe is designed for antomotive anticollision radar in this paper. The proposed microstrip antenna array is fed by a series-parallel feeding network which can reduce loss of feed network and realize miniaturization of antenna on basis of satisfying requirement of each element of antenna array excited by the unequal amplitude. The...
In this paper, a design method of electrically controlled leaky wave antenna based on liquid crystal is proposed and investigated. The leaky wave antenna is composed of a rectangular waveguide and an inverted PCB micro-strip structure with eight short slots. By loading bias voltage to the liquid crystal, the leaky wave antenna implements wide beam scanning on fixed frequencies. Simulation results...
A novel band-pass Frequency Selective Surface (FSS) working on L-band is presented in this paper. By means of the coupling effect of the metallic patches on three different layers, the distributed capacitance of the periodic structure is formed and therefore decreases the resonant frequency. Investigations on the structure variables are presented and a novel unit cell, whose size is only λ0/20, is...
The complexity and high insert loss of radio frequency (RF) front ends are main constrains in application of Multiple-Input Multiple-Output (MIMO) system, especially in large scale scenarios. As an attractive solution, the concept of switched parasitic array (SPA) was proposed to realize the same performance of MIMO system with single RF chain. To assess its feasibility and efficiency, in this paper,...
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