به نام خدا
Title: Low Power VLSI Implementation of Adaptive Noise Canceller Based on LeastMean Square Algorithm
Authors: Vakulabharanam Ramakrishna, Tipparti Anil Kumar
Abstract: This paper presents VLSI implementation of adaptive noise canceller based on least mean square algorithm. First, the adaptive parameters are obtained by simulating noise canceller on MATLAB. Simulink model of adaptive noise canceller was developed and the noise is suppressed to a much larger extent in recovering the original signal. The data such as input and output signals, desired signal, step size factor and coefficients of adaptive filter was processed by FPGA. Finally, the functions of field programmable gate array -based system structure for adaptive noise canceller based on LMS algorithm are synthesized, simulated, and implemented on XilinxXC3s200 field programmable gate array using Xilinx ISE tool. The research results show that it is feasible to implement and use adaptive least mean square filter based adaptive noise canceller design which consumed a low power of 0.156W at29.1° C in a single field programmable gate array chip.
Publish Year: 2013
Published in: ISMS - IEEE
Number of Pages: 4
موضوع: طراحی مدارهای VLSI – سخت افزار کامپیوتر
ایران سای – مرجع مقالات علمی فنی مهندسی
حامی دانش بومی ایرانیان
به نام خدا
Title: Information Fusion and Discounting Techniques for Decision Support in Aerospace
Authors: Fiona Browne , Yan Jin , Niall Rooney Hui Wang
Abstract: Decision makers are required to make critical decisions throughout all stages of a life-cycle in large-scale projects. These decisions are important as they impact upon the outcome and the success of projects. In this paper we present an evidential reasoning framework to aid decision-makers in the decision - making process. This approach utilizes the Dezert-Smarandache Theory (DSm) to fuse heterogeneous evidence sources that suffer from levels of uncertainty, imprecision and conflicts to provide beliefs for decision options. To analyze the impact that source reliability and priority has upon the decision making process a reliability discounting technique along with a priority discounting technique are applied. Application of the evidential reasoning framework is illustrated using a Case Study based in the Aerospace domain.
Publish Year: 2012
Published in: INDIN - IEEE
Number of Pages: 6
موضوع: مهندسی هوافضا، سیستمهای تصمیم یار
ایران سای – مرجع مقالات علمی فنی مهندسی
حامی دانش بومی ایرانیان
به نام خدا
Title: A Cognitive Link Adaptation Strategy with Differentiated Responses on Wi-Fi System-on-Chip
Authors: Taeyoung Lee, Myounghwan Lee, Jaeeun Kang, Kyungik Cho, ChilYoul Hacky Yang, and Scott Seongwook Lee
Abstract: The dynamic change of wireless channel condition causes poor Wi-Fi quality of service. To cope with the channel variation of wireless communication, the essential strategy for the physical layer with multi-rate capability is the link adaptation. However, because definite guidelines for rate changes do not exist, most link adaptation algorithms can misleadingly increase transmission rates. Therefore, we propose a cognitive link adaptation scheme, sensing link adaptation urgency and responding with differentiated rate control such as the long-term rate adaptation with a short-term rate drop. To evaluate the proposed scheme, we implement the link adaptation scheme on Wi-Fi System-on-Chip, applying the optimal HW/SW partitioning technique to reduce the SW processing delay from heavy operating calculation for the algorithm. The experiment shows that the proposed algorithm increases the packet arrival rate in a real Wi-Fi environment by reducing transmission failure due to wrong rate changes.
Publish Year: 2013
Published in: CCNC - IEEE
Number of Pages: 6
موضوع: شبکه های بی سیم
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حامی دانش بومی ایرانیان
به نام خدا
Title: The alpha parallelogram predictor: A lossless compression method for motion capture data
Authors: Pengjie Wang , Zhigeng Pan d,a , Mingmin Zhang a, , Rynson WH Lau c , Haiyu Song
Abstract: Motion capture data in an uncompressed form can be expensive to store, and slow to load and transmit. Current compression methods for motion capture data are primarily lossy and cause distortions in the motion data. In this paper, we present a lossless compression algorithm for motion capture data. First, we propose a novel Alpha Parallelogram Predictor (APP) to estimate the DOF (degree of freedom) of each child joint from those of its immediate neighbors and parents that have already been processed. The prediction parameter of the predictor, which is referred to as the alpha parameter, is adaptively chosen from a care- fully designed lookup table. Second, we divide the predicted and actual values into three components: sign, exponent and mantissa. We then compress their corrections separately with context-based arithmetic coding. Compared with other lossless compression methods, our approach can achieve a higher compression ratio with a comparable compression time. It can be used in situations where lossy compression is not preferred.
Publish Year: 2013
Published in: Information Sciences - Science Direct
Number of Pages: 10
موضوع: فشرده سازی داده ها
ایران سای – مرجع مقالات علمی فنی مهندسی
حامی دانش بومی ایرانیان
به نام خدا
Title: Solution blown nanofibrous membrane for microfiltration
Authors: Xupin Zhuang a,b , Lei Shi a , Kaifei Jia a , Bowen Cheng b,n , Weimin Kang
Abstract: Nanofibrous membranes have been paid attention in microfiltration. Solution blowing process is a new nanofiber fabricating method with high productivity. In this study, polyvinylidene fiuoride (PVDF) nanofibrous mat was successfully solution blown using a multiorifices die. The fibers were mostly 60 280 nm in diameter and three-dimensional curly which resulted in a loose construction with high porosity of 95.8%. The nanofibrous mat was further hot-pressed to increase its integrality. The structure and microfiltration performance was evaluated. The results showed the crystallinity of the membranes increased, the porosity and pore size decreased after hot-pressing treatment. The hot-pressed membranes showed high retention ratio against microparticles and high pure water fiux which will help the solution blown membrane find application in high fiux microfiltration.
Publish Year: 2013
Published in: Journal of Membrane Science - Science Direct
Number of Pages: 5
موضوع: فناوری نانو
ایران سای – مرجع مقالات علمی فنی مهندسی
حامی دانش بومی ایرانیان