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

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Cooperative spectrum sensing in cognitive radio network with power control 基于功率控制的认知无线电网络协同频谱感知
2012 5th International Conference on Computers and Devices for Communication (CODEC) Pub Date : 2012-12-01 DOI: 10.1109/CODEC.2012.6509224
A. Bhowmick, Sanjay Dhar Roy, S. Kundu
{"title":"Cooperative spectrum sensing in cognitive radio network with power control","authors":"A. Bhowmick, Sanjay Dhar Roy, S. Kundu","doi":"10.1109/CODEC.2012.6509224","DOIUrl":"https://doi.org/10.1109/CODEC.2012.6509224","url":null,"abstract":"Efficient control of transmission power of secondary users (SUs) in an underlay cognitive radio network (CRN) is needed to limit interference on primary users (PUs). Decision regarding the presence of primary user (PU) helps in controlling transmission power of secondary user (SU). In this paper a scheme on joint power control of SUs is investigated. Power control of SUs to minimize interference on PUs in co-existing network is achieved more efficiently with the improved spectrum sensing decision as obtained through co-operation among a number of cognitive radios (CRs). The maximum allowable transmission powers of secondary users have also been estimated in terms of distance between PU receiver and SUs in a cooperative spectrum sensing framework.","PeriodicalId":399616,"journal":{"name":"2012 5th International Conference on Computers and Devices for Communication (CODEC)","volume":"29 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":"133539128","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
A simple analytical model of silicon on insulator tunnel FET 绝缘子上硅隧道场效应管的简单解析模型
2012 5th International Conference on Computers and Devices for Communication (CODEC) Pub Date : 2012-12-01 DOI: 10.1109/CODEC.2012.6509256
S. Kanungo, H. Rahaman, P. Gupta, P. Dasgupta
{"title":"A simple analytical model of silicon on insulator tunnel FET","authors":"S. Kanungo, H. Rahaman, P. Gupta, P. Dasgupta","doi":"10.1109/CODEC.2012.6509256","DOIUrl":"https://doi.org/10.1109/CODEC.2012.6509256","url":null,"abstract":"An analytical model for the 2D potential distribution in sub-threshold regime of operation of a SOI TFET structure under the assumption of a sinusoidal potential distribution in the direction perpendicular to the gate in the middle portion of the channel is developed. Role of any charge on the channel potential is neglected. The model predicts the transfer characteristics of the device with reasonable accuracy.","PeriodicalId":399616,"journal":{"name":"2012 5th International Conference on Computers and Devices for Communication (CODEC)","volume":"51 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":"117350704","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: 5
Performance evaluation of a new semi-orthogonal spreading code in an AWGN channel 一种新型半正交扩频码在AWGN信道中的性能评价
2012 5th International Conference on Computers and Devices for Communication (CODEC) Pub Date : 2012-12-01 DOI: 10.1109/CODEC.2012.6509238
A. S. Hazari, S. Kundu, A. Chandra
{"title":"Performance evaluation of a new semi-orthogonal spreading code in an AWGN channel","authors":"A. S. Hazari, S. Kundu, A. Chandra","doi":"10.1109/CODEC.2012.6509238","DOIUrl":"https://doi.org/10.1109/CODEC.2012.6509238","url":null,"abstract":"Code Division Multiple Access (CDMA) emerges as one of the efficient multiple access techniques that can serve a large number of users simultaneously over the entire available channel bandwidth. Each user in this access system is accompanied with a unique spreading code which acts as its signature code. As a matter of fact, researchers have tried to maximize the number of distinct spreading codes while keeping in mind that the cross-correlation value between any two code members should be as low as possible to ensure little multi-user interference. In this paper, an algorithm has been proposed which can generate a new type of spreading code, named as SemiOrthogonal Modified Large-set Kasami (SOMLK) sequence. Characteristic of our proposed code has been investigated by means of a number of performance parameters and subsequently been compared with other spreading codes. Finally, SOMLK sequence has been used as a signature code in a multi-user CDMA system under Additive White Gaussian Noise (AWGN) channel and the resulting Bit Error Rate (BER) performance has been studied for different values of Signal to Noise Ratio (SNR) along with other existing spreading codes.","PeriodicalId":399616,"journal":{"name":"2012 5th International Conference on Computers and Devices for Communication (CODEC)","volume":"39 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":"116486746","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
Reversible circuit synthesis using evolutionary algorithm 基于进化算法的可逆电路合成
2012 5th International Conference on Computers and Devices for Communication (CODEC) Pub Date : 2012-12-01 DOI: 10.1109/CODEC.2012.6509351
K. Datta, I. Sengupta, H. Rahaman
{"title":"Reversible circuit synthesis using evolutionary algorithm","authors":"K. Datta, I. Sengupta, H. Rahaman","doi":"10.1109/CODEC.2012.6509351","DOIUrl":"https://doi.org/10.1109/CODEC.2012.6509351","url":null,"abstract":"With the prospect of availability of quantum computers in not-so-distant future, research on the synthesis and testing of reversible logic circuits have gained momentum in recent years. There are many existing works for the synthesis of reversible logic circuits, some of them being exact while some others approximate and based on some heuristics. Many of these methods work for reasonably smaller circuits, but fail with the increase in the number of inputs, either in terms of large memory and computation time requirements, or in terms of failure in arriving at the solution. In this paper, we have proposed a synthesis approach that uses Genetic Algorithm (GA) for searching the solution space, and is based on a gate library consisting of NOT, CNOT and generalized Toffoli gates. This method gives good solutions to circuits with up to 5 or 6 inputs very fast. A divide-and-conquer approach is also proposed towards the end of the paper as a future work using which larger circuits can be handled.","PeriodicalId":399616,"journal":{"name":"2012 5th International Conference on Computers and Devices for Communication (CODEC)","volume":"201 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":"116168025","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: 10
New first order multifunction filter employing operational transresistance amplifier 采用运算跨阻放大器的新型一阶多功能滤波器
2012 5th International Conference on Computers and Devices for Communication (CODEC) Pub Date : 2012-12-01 DOI: 10.1109/CODEC.2012.6509218
K. Banerjee, A. Ranjan, S. K. Paul
{"title":"New first order multifunction filter employing operational transresistance amplifier","authors":"K. Banerjee, A. Ranjan, S. K. Paul","doi":"10.1109/CODEC.2012.6509218","DOIUrl":"https://doi.org/10.1109/CODEC.2012.6509218","url":null,"abstract":"This research paper introduces a new voltage mode first order multifunction filter using three operational transresistance amplifier (OTRA) and some passive components. A single topology is used for the implementation of first order low pass(LP), high pass(HP) and all pass(AP) filter functions. One can tap all the three filter functions simultaneously form the proposed topology. It is simulated using PSPICE with 0.5μm CMOS process parameters provided by MOSIS (AGILENT). The simulation results nicely match with the theoretical results.","PeriodicalId":399616,"journal":{"name":"2012 5th International Conference on Computers and Devices for Communication (CODEC)","volume":"14 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":"114652371","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: 14
Comparison of propagation delay in single- and multi-layer graphene nanoribbon interconnects 单层和多层石墨烯纳米带互连中传输延迟的比较
2012 5th International Conference on Computers and Devices for Communication (CODEC) Pub Date : 2012-12-01 DOI: 10.1109/CODEC.2012.6509357
M. Majumder, R. Narasimha, B. Kaushik, S. Manhas
{"title":"Comparison of propagation delay in single- and multi-layer graphene nanoribbon interconnects","authors":"M. Majumder, R. Narasimha, B. Kaushik, S. Manhas","doi":"10.1109/CODEC.2012.6509357","DOIUrl":"https://doi.org/10.1109/CODEC.2012.6509357","url":null,"abstract":"Multi-layer graphene nanoribbons (MLGNRs) have potentially provided attractive solution over single-layer GNR (SLGNR) interconnects. This research paper presents an equivalent RLC model for GNR interconnects to study the effect of propagation delay. A driver-interconnect-load (DIL) system employing CMOS driver is used to analyze the performance. It has been observed that the overall delay performance is improved by 94.5% for MLGNR as compared to SLGNR.","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":"130829622","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: 13
Optical DEMUX using silicon-silica based 2D photonic crystal 光学DEMUX使用硅-二氧化硅基二维光子晶体
2012 5th International Conference on Computers and Devices for Communication (CODEC) Pub Date : 2012-12-01 DOI: 10.1109/CODEC.2012.6509313
A. Praharaj, C. Bose, S. Dasgupta
{"title":"Optical DEMUX using silicon-silica based 2D photonic crystal","authors":"A. Praharaj, C. Bose, S. Dasgupta","doi":"10.1109/CODEC.2012.6509313","DOIUrl":"https://doi.org/10.1109/CODEC.2012.6509313","url":null,"abstract":"A 1:2 optical de-multiplexer is designed using two dimensional photonic crystal composed of silicon rods embedded in silicon dioxide slab to form a square lattice. The design is based on the concept used by Niemi et. al for a two dimensional silicon-air photonic crystal with triangular lattice. Two different configurations for the desired DEMUX are proposed. They, while efficiently coupling the channel wavelengths to intended waveguides, ensure sharp spectral response and unwanted signal suppression. The structures are simulated using CST Microwave Studio.","PeriodicalId":399616,"journal":{"name":"2012 5th International Conference on Computers and Devices for Communication (CODEC)","volume":"36 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":"127936125","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: 1
Voltage controlled current starved delay cell for Positron Emission Tomography specific DLL based high precision TDC implementation 基于高精度TDC的正电子发射断层扫描专用DLL的压控缺流延迟单元实现
2012 5th International Conference on Computers and Devices for Communication (CODEC) Pub Date : 2012-12-01 DOI: 10.1109/CODEC.2012.6509270
S. A. Mondal, S. Pal, H. Rahaman, P. Mondal
{"title":"Voltage controlled current starved delay cell for Positron Emission Tomography specific DLL based high precision TDC implementation","authors":"S. A. Mondal, S. Pal, H. Rahaman, P. Mondal","doi":"10.1109/CODEC.2012.6509270","DOIUrl":"https://doi.org/10.1109/CODEC.2012.6509270","url":null,"abstract":"This work focuses on high performance voltage controlled current starved delay cell (CSDC) design. This delay cell will be used in Delay locked loop (DLL) based high precision Time-to-digital converter (TDC) implementation for Positron Emission Tomography (PET) application. DLL generates clocks of different phases. Sampling these clocks, sub-periodic time can be accurately measured as integer multiple of bin-size (unit delay difference between successive phases). Array of Delay locked loop (ADLL) can generate bin-size even below inverter delay for any technology node. With our delay cell, an ADLL can easily produce a bin size of 71.2ps using 100 MHz clock. Our delay cell consumes maximum static power of 267 uW with peak to peak delay mismatch of 2.86 ps and 0.684 ps rms delay mismatch. Unlike other delay cell, the transfer curve of our delay cell has lower slope and monotone decreasing function of control voltage below VTN. Dead-band in the transfer curve is inherently removed.","PeriodicalId":399616,"journal":{"name":"2012 5th International Conference on Computers and Devices for Communication (CODEC)","volume":"46 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":"124648598","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: 3
Influence of geometrical shape of quantum dot on field emission 量子点几何形状对场发射的影响
2012 5th International Conference on Computers and Devices for Communication (CODEC) Pub Date : 2012-12-01 DOI: 10.1109/CODEC.2012.6509299
S. Sett, C. Bose
{"title":"Influence of geometrical shape of quantum dot on field emission","authors":"S. Sett, C. Bose","doi":"10.1109/CODEC.2012.6509299","DOIUrl":"https://doi.org/10.1109/CODEC.2012.6509299","url":null,"abstract":"We present a comparative study of field emission from quantum dots of different geometrical shapes. In course, we formulate the field emission current density from a quantum box (cube) experiencing Fowler Nordheim tunneling. Three other quantum dots - one spherical and two cylindrical, all of volume as same as the quantum cube, are considered. Variations of the current density with applied electric field and dot dimension are studied for all dots, and compared in this communication.","PeriodicalId":399616,"journal":{"name":"2012 5th International Conference on Computers and Devices for Communication (CODEC)","volume":"32 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":"114012486","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: 1
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
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