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Sphere decoding (SD) is an efficient algorithm for Multiple-input Multiple-output (MIMO) digital communications. It has been showed to achieve near Maximum Likelihood (ML) performance with low complexity. However, the complexity of conventional SD algorithm is high under the specific environment. The performance and the computation complexity of SD algorithm is highly dependent on the initial choice...
Sphere decoding(SD)is an efficient algorithm which has been proposed in Multiple input Multiple output (MIMO) digital communication. Sphere decoding algorithm is based on the rule of maximum likelihood decoding algorithm, But SD algorithm does not like ML algorithm to retrieve all of the lattice. However, SD in some environment complexity is very high. The complexity of the SD is controlled by radius...
Polymer solar cells (PSCs) have attracted considerable attention because of their potential advantages of low cost, light weight, flexible fabrication and low-temperature solution processing technique. After the bulk heterojunction (BHJ) architecture was introduced into PSCs, the PCE had promptly increased quickly from 1% to 10% by designing polymer structures and optimizing device fabrication technologies...
We present a novel optical sensor based on a one-dimensional photonic crystal slot nanobeam cavity. An ultra-high quality factor of 174,000 is obtained. The sensor possesses an estimated very high sensitivity of 851 nm/RIU.
A method to get the quasi-peak (QP) response of EMI receiver to inputs of corona pulses is presented. The present method is a dynamic simulation method which can produce the instantaneous QP response step by step in time domain. The validity of the method is verified by comparing the calculated results with the CISPR specifications as well as with the measured results of an EMI receiver. Based on...
This paper describes a platform for measuring the multiple DC corona-generated effects, i.e. audible noise, ionized fields, ion current density and steady corona current simultaneously. The platform includes the corona cage for generating the corona discharge, the corresponding measuring equipment for each corona effect, and the acquisition and analysis system based on LabVIEW. The system can acquire...
Running HVAC and HVDC transmission lines in same corridor is an effective way to minimize land use of transmission lines. The control of ion flow field at the ground is one of major obstacles in the construction of such projects. In this paper, a 1000kV HVAC and ±800kV HVDC hybrid transmission lines was chosen as an example. Based on finite element method (FEM) and finite volume method (FVM), the...
This paper is aimed at analyzing the inception voltage of positive direct current (DC) corona at different altitudes for the stranded conductor to ground structure. An improved numerical method which combines the corona onset criterion involving the action of photoionization and the improved charge simulation method is presented. The effect of altitude on the inception voltage and the electric field...
In this paper, the time-domain measurement method for audible noise is employed to study the time and frequency domains characteristics of audible noise generated by single corona discharge under DC and AC voltage in a coaxial geometry. The results show that in time-domain the audible noise from positive and negative corona discharge both consist of a series of random sound pressure pulses and the...
A new laboratory test bed of on-orbit servicing system is introduced that enables simulation of the autonomous approach and docking of a chaser spacecraft to a target spacecraft with similar mass. The test bed system consists of a chaser and a target spacecraft simulator floating via air pads on a marble platform. Relative navigation of the chaser spacecraft is obtained by the united measurements...
Supersonic Pulsed Detonation Ramjet Engine (SPDRE) is a novel and promising alternative for idea propulsion systems for future supersonic aircrafts, which utilizes the internal instabilities of detonation waves caused by the alternations of mixing ratios, and obtains thrust by means of organizing pulsed-oscillating detonation waves in supersonic reactive flows. The conception and basic principles...
Multidisciplinary collaborative design is an effective solution to complex system design. The main contents and development status of collaborative design platform are researched in this paper. It is found that integrated design flexible simulation and virtual test is becoming the development trend of multidisciplinary collaborative environment. A collaborative design and simulation environment for...
According to bibliography, this article classifies literatures with different structures and different style. It breaks through the traditional concept of field name and substitutes it with a kind of range to realize synchronous search and show of data with several kinds of formats successfully for the convenience of literature's management and use, which supplies a new thought and facilities the...
Though the advantage of RFID (Radio-Frequency Identification) technology has been consistently recognized over the years, there are still doubts about its actual effects on the BP (business process) improvement. In order to facilitate the adoption of RFID technology, it is required to measure RFID's positive effects on the BP. Our research focuses on the evaluation of BP efficiency at the Mail Distribution...
This article makes further study on data needed by automatic construction for Chinese medicine ontology' concept description architecture, reconstructs and uses recognized knowledge in Chinese medicine's domain by theory and technology of NLP. Based on realizing Chinese medicine knowledge description architecture's automatic construction and acquiring successfully , this article use experts' knowledge...
We report an experimental study based on spectral domain optical coherence tomography (SDOCT) to get depth resolved high-frequency modulated light scattering spectrum (LSS) for polystyrene micro particles with two different sizes: 7 um and 15 um in diameter. By filtering axial line signal with a Gaussian window, and doing IFFT for the filtered signal, we get the modulated LSS for the two types of...
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