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2012 5th International Conference on Computers and Devices for Communication (CODEC)最新文献

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Synchronous overloaded system for the uplink of cellular CDMA with Unequal Chip Delay Spreading (UCDS) 不均匀片延迟扩展(UCDS)蜂窝CDMA上行链路同步过载系统
2012 5th International Conference on Computers and Devices for Communication (CODEC) Pub Date : 2012-12-01 DOI: 10.1109/CODEC.2012.6509233
Amiya Singh, Poonam Singh
{"title":"Synchronous overloaded system for the uplink of cellular CDMA with Unequal Chip Delay Spreading (UCDS)","authors":"Amiya Singh, Poonam Singh","doi":"10.1109/CODEC.2012.6509233","DOIUrl":"https://doi.org/10.1109/CODEC.2012.6509233","url":null,"abstract":"Channel overloading in Code Division Multiple Access (CDMA) facilitates to accommodate more number of users than the assigned spreading factor N. Our proposal for a synchronous CDMA technique for the uplink of a cellular system over additive white gaussian noise (AWGN) channel achieves oversaturation by using the same set of orthogonal Walsh Hadamard codes and a receiver with lower complexity. The technique involves dividing the total number of active users into G groups, each with L users. Each user in a group is assigned the same signature sequence but with different chip duration. Users in a group can be classified as Primary and Secondary. The Primary user avails the spreading sequence with the maximum chip duration Tc. The rest L-1 (secondary) users are assigned the same code with chip duration as multiples of Tc/L. Unlike conventional Direct Sequence CDMA (DS-CDMA), all the users participate in spreading using the proposed Unequal Chip Delay Spreading (UCDS) technique. The receiver contains a switching unit to separate the received stream into L sub-streams followed by the detection process using a simple multi user detector. On the other hand, L levels of Unequal Error Protection (UEP) can be attained due to the unequal amount of multiple access interference (MAI) existing in alternate chip interval during transmission. Unequal chip delay spreading finally enables it to have a L-fold increase in the user data rate at the receiving end as compared to that of the transmission.","PeriodicalId":399616,"journal":{"name":"2012 5th International Conference on Computers and Devices for Communication (CODEC)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122913945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Performance comparison of different adaptive beamforming algorithm in smart antennas 智能天线中不同自适应波束形成算法的性能比较
2012 5th International Conference on Computers and Devices for Communication (CODEC) Pub Date : 2012-12-01 DOI: 10.1109/CODEC.2012.6509188
S. Imtiaj, I. S. Misra, R. Biswas
{"title":"Performance comparison of different adaptive beamforming algorithm in smart antennas","authors":"S. Imtiaj, I. S. Misra, R. Biswas","doi":"10.1109/CODEC.2012.6509188","DOIUrl":"https://doi.org/10.1109/CODEC.2012.6509188","url":null,"abstract":"Smart antenna is the most efficient leading adaptive beamforming technique for maximum coverage, null steering, offer higher system capacity and improved quality of the service compared to other antennas. This paper proposes the historical development of fixed weight beamforming basics (FWBB), adaptive arrays and finally a comparison made between performance of two adaptive algorithms - Least Mean Square (LMS) and Sample Matrix Inversion (SMI).","PeriodicalId":399616,"journal":{"name":"2012 5th International Conference on Computers and Devices for Communication (CODEC)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124506794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Group theory based reversible logic synthesis 基于群论的可逆逻辑综合
2012 5th International Conference on Computers and Devices for Communication (CODEC) Pub Date : 2012-12-01 DOI: 10.1109/CODEC.2012.6509346
K. Datta, I. Sengupta, H. Rahaman
{"title":"Group theory based reversible logic synthesis","authors":"K. Datta, I. Sengupta, H. Rahaman","doi":"10.1109/CODEC.2012.6509346","DOIUrl":"https://doi.org/10.1109/CODEC.2012.6509346","url":null,"abstract":"With increase in emphasis on low-power design and quantum computation, research in reversible logic synthesis has gained great attention. Various methods of synthesis exist in the literature, like exact synthesis, heuristic approaches, methods based on group theory, and those based on higherlevel representation of functions like Binary Decision Diagram (BDD). In this paper a group theory based synthesis approach for reversible circuits is presented, using both positive-control and negative-control Toffoli gates. The method uses group theoretic rules for factoring permutation cycles for synthesis. The use of both positive and negative control Toffoli gates results in reduction of total number of gates required as compared to previous methods based on group theory. Several worked out examples illustrate the advantage of the proposed approach.","PeriodicalId":399616,"journal":{"name":"2012 5th International Conference on Computers and Devices for Communication (CODEC)","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115931420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
A Multimode interference star coupler with S-bend waveguide s弯波导多模干涉星形耦合器
2012 5th International Conference on Computers and Devices for Communication (CODEC) Pub Date : 2012-12-01 DOI: 10.1109/CODEC.2012.6509301
S. Raghuwanshi, S. Kumar
{"title":"A Multimode interference star coupler with S-bend waveguide","authors":"S. Raghuwanshi, S. Kumar","doi":"10.1109/CODEC.2012.6509301","DOIUrl":"https://doi.org/10.1109/CODEC.2012.6509301","url":null,"abstract":"The finite difference beam propagating method (BPM) is one of the most powerful technique to investigate linear and nonlinear lightwave propagation phenomena in axially varying waveguides such as curvilinear directional couplers, branching and combining waveguides, S-shaped bend waveguides, and tapered waveguides. BPM is also quite important for the analysis of ultra short light pulse propagation in optical fibers. To date numerous algorithms for BPM have been proposed and successfully applied to a very wide class of dielectric optical waveguide structures. In this paper, we have analyzed the Multimode interference (MMI) star coupler by Beam Propagation Method (BPM) having S-bend waveguide. We have compared the MMI star coupler with the simple MMI coupler. It has been found that power distribution in all four output S-bend waveguide is almost identical, which reflects the desired result.","PeriodicalId":399616,"journal":{"name":"2012 5th International Conference on Computers and Devices for Communication (CODEC)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115399188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A generalized current mode first order filter using single current controlled differential difference current conveyor 采用单电流控制差动电流输送装置的广义电流模式一阶滤波器
2012 5th International Conference on Computers and Devices for Communication (CODEC) Pub Date : 2012-12-01 DOI: 10.1109/CODEC.2012.6509211
A. Ranjan, S. K. Paul
{"title":"A generalized current mode first order filter using single current controlled differential difference current conveyor","authors":"A. Ranjan, S. K. Paul","doi":"10.1109/CODEC.2012.6509211","DOIUrl":"https://doi.org/10.1109/CODEC.2012.6509211","url":null,"abstract":"This research paper contains current mode first order filter structures using single current controlled differential difference current conveyor (CCDDCC) and passive components. It can implement both inverting and non-inverting low pass, high pass and all pass functions from the same topology. The gain of the both inverting and non-inverting filters can be electronically controlled with the help of intrinsic resistance at X-terminal of CCDDCC. Phase of all pass filter can be changed over the whole range (180° to -180°). The structures are simulated using PSPICE with TSMC 0.25μm CMOS process. Simulation results agree well with the theory.","PeriodicalId":399616,"journal":{"name":"2012 5th International Conference on Computers and Devices for Communication (CODEC)","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116036480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Nano-structured metal-semiconductor-metal photo-detectors for enhanced light absorption 用于增强光吸收的纳米结构金属-半导体-金属光电探测器
2012 5th International Conference on Computers and Devices for Communication (CODEC) Pub Date : 2012-12-01 DOI: 10.1109/CODEC.2012.6509294
N. Das, F. F. Masouleh, H. Mashayekhi
{"title":"Nano-structured metal-semiconductor-metal photo-detectors for enhanced light absorption","authors":"N. Das, F. F. Masouleh, H. Mashayekhi","doi":"10.1109/CODEC.2012.6509294","DOIUrl":"https://doi.org/10.1109/CODEC.2012.6509294","url":null,"abstract":"Nano-structured metal-semiconductor-metal photodetectors (MSM-PDs) are enable to assist in future high-speed communication devices achieving high responsivity-bandwidth characteristics. Finite difference time-domain (FDTD) method is used to calculate the light absorption enhancement of nano-grating assisted MSM-PDs near the design wavelength by varying detector's geometrical parameters in comparison with a conventional device. The substrate containing apertures and the nano-gratings are optimized in thickness to trigger extraordinary optical transmission. Besides, it demonstrates how the coupling condition satisfies the oscillating charge densities evolution to the surface plasmon polaritons under illumination of polarized light. The simulation results confirm that the light absorption enhancement of nano-grating assisted MSM-PDs is ~13.5-times better than the conventional MSM-PDs.","PeriodicalId":399616,"journal":{"name":"2012 5th International Conference on Computers and Devices for Communication (CODEC)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127101290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Study of light propagation in photonic and plasmonic crystals through fourier image spectroscopy 傅里叶成像光谱法研究光在光子和等离子体晶体中的传播
2012 5th International Conference on Computers and Devices for Communication (CODEC) Pub Date : 2012-12-01 DOI: 10.1109/CODEC.2012.6509266
M. López-García
{"title":"Study of light propagation in photonic and plasmonic crystals through fourier image spectroscopy","authors":"M. López-García","doi":"10.1109/CODEC.2012.6509266","DOIUrl":"https://doi.org/10.1109/CODEC.2012.6509266","url":null,"abstract":"Photonic crystals and plasmonic structures have become a key subject in the future of optical communications and optical computing. Therefore, the study of their optical properties has become challenging in the last few years since they present micro or nanometric dimensions which makes it difficult their proper optical characterization. In this talk I will show that making use of Fourier image spectroscopy with NA objectives one can obtain full information on the near and far field scattering/emission patterns of this structures. I will also show examples of photonic and plasmonic crystals where we obtained experimental measurements of the photonics bands using this technique.","PeriodicalId":399616,"journal":{"name":"2012 5th International Conference on Computers and Devices for Communication (CODEC)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125410007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Studies on compact, multiple resonant Frequency Selective Surface (FSS) by cutting different novel shaped slits within rectangular shaped patch 通过在矩形贴片内切割不同形状的狭缝，研究紧凑、多谐振频率选择表面
2012 5th International Conference on Computers and Devices for Communication (CODEC) Pub Date : 2012-12-01 DOI: 10.1109/CODEC.2012.6509201
Surajit Mondal, Tanumay Mondol, S. Nandi, Shwetanki Singh, P. Sarkar
{"title":"Studies on compact, multiple resonant Frequency Selective Surface (FSS) by cutting different novel shaped slits within rectangular shaped patch","authors":"Surajit Mondal, Tanumay Mondol, S. Nandi, Shwetanki Singh, P. Sarkar","doi":"10.1109/CODEC.2012.6509201","DOIUrl":"https://doi.org/10.1109/CODEC.2012.6509201","url":null,"abstract":"This paper deals with the theoretical investigation on a reduced size and multiple resonant Frequency Selective Surface (FSS). The FSS is designed by cutting different types of novel shaped slits within a rectangular shaped patch keeping same periodicity throughout. Compared to conventional patch FSS the designed FSS can provide reduction in resonant frequency resulting in size reduction up to 28.04%.and 96.48% corresponding to resonant frequencies 10.18GHz and 2.25GHz respectively. Theoretical investigations have been done by Ansoft designer® software.","PeriodicalId":399616,"journal":{"name":"2012 5th International Conference on Computers and Devices for Communication (CODEC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126840343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
All-optical XOR/XNOR logic gate using micro-ring resonators 采用微环谐振器的全光XOR/XNOR逻辑门
2012 5th International Conference on Computers and Devices for Communication (CODEC) Pub Date : 2012-12-01 DOI: 10.1109/CODEC.2012.6509327
J. K. Rakshit, J. N. Roy, T. Chattopadhyay
{"title":"All-optical XOR/XNOR logic gate using micro-ring resonators","authors":"J. K. Rakshit, J. N. Roy, T. Chattopadhyay","doi":"10.1109/CODEC.2012.6509327","DOIUrl":"https://doi.org/10.1109/CODEC.2012.6509327","url":null,"abstract":"Simultaneous logic and its inverse operation in a single circuit is very important and effective research topics in optical computing recently. Many designes have been proposed by many authors in different approach. Among them micro-ring resonator based ‘directed logic’ circuit is attractive, because it can be easily fabricated in chip level. But most of the proposed logic circuits are based on electrical pumping. To over come the optical-electrical bottleneck here we have used optical pumping rather than electrical. In this literature we proposed two cascaded micro-ring resonator based all optical circuit capable of carrying out simultaneous XOR and XNOR operations. Simulation results confirming described method is also reported. The proposed all-optical logic circuit can be easily extended to n-bit XOR/XNOR circuit which is also shown in this manuscript.","PeriodicalId":399616,"journal":{"name":"2012 5th International Conference on Computers and Devices for Communication (CODEC)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124134389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 30
Space weather effects on the performance of satellite-based communication systems: Space weather and radio communication 空间天气对星基通信系统性能的影响:空间天气和无线电通信
2012 5th International Conference on Computers and Devices for Communication (CODEC) Pub Date : 2012-12-01 DOI: 10.1109/CODEC.2012.6509207
A. Bhattacharyya
{"title":"Space weather effects on the performance of satellite-based communication systems: Space weather and radio communication","authors":"A. Bhattacharyya","doi":"10.1109/CODEC.2012.6509207","DOIUrl":"https://doi.org/10.1109/CODEC.2012.6509207","url":null,"abstract":"Effects of space weather on the performance of satellite-based communication/ navigation systems have been studied for several decades. A major concern is the predictability of these effects. Apart from the effects produced by changes in the large-scale distribution of plasma in the ionosphere, it is the sub-kilometer structures that appear in the ionosphere that are of great concern as they give rise to scintillations on transionospheric radio signals. The current status of various aspects of scintillations produced by equatorial ionospheric irregularities in the context of space weather is reviewed here.","PeriodicalId":399616,"journal":{"name":"2012 5th International Conference on Computers and Devices for Communication (CODEC)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121886859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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