International Symposium on Communication Systems, Networks and Digital Signal Processing最新文献

{"title":"Prefilter bandwidth effects in asynchronous sequential symbol synchronizers based on pulse comparison operating by positive transitions at half bit rate","authors":"A. Reis, J. P. Carvalho, J. F. Rocha, A. Gameiro","doi":"10.1109/CSNDSP.2016.7574045","DOIUrl":"https://doi.org/10.1109/CSNDSP.2016.7574045","url":null,"abstract":"This work investigates the prefilter bandwidth effects in four asynchronous sequential bit synchronizers. The prefilter bandwidth is changed between three discrete values, namely B1=∞, B2=2.tx and B3=1.tx, where tx is the bit rate. The synchronizers distinguish 2 variants, one asynchronous by both transitions at rate and other asynchronous by positive transitions at half rate. Each variant has two versions which are the manual and the automatic. The objective is to study the three prefilter bandwidths with the four synchronizers and to evaluate their output jitter UIRMS (Unit Interval Root Mean Square) as function of the input SNR (Signal Noise Ratio).","PeriodicalId":222283,"journal":{"name":"International Symposium on Communication Systems, Networks and Digital Signal Processing","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128857567","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}

{"title":"Performance Evaluation of Multicast Overlay Routing Protocols","authors":"Krzysztof Stachowiak, T. Pawlak, M. Piechowiak","doi":"10.2478/v10248-012-0012-4","DOIUrl":"https://doi.org/10.2478/v10248-012-0012-4","url":null,"abstract":"Abstract For almost three decades the multicast communication has been a subject of a dynamic research. It came to the world of the packet switching networks rather late and still has not become a fist class citizen of the Internet, yet the demand for such services is growing and thus the relevant technologies evolve persistently providing increasing quality and availability of the means of the group communication. The overlay approach to the multicast is an application layer realization which came to life due to certain deficiencies at the lower layers. In general the gain from using multicast for group communication instead of duplicated unicast links is that we avoid sending the same data many times through a single link. Such gain may be achieved wit the use of the router level mulitcast solution. The overlay solutions tend to approach his level of efficiency with a different degree of success. Therefore one of the main characteristics that is interesting when evaluating a particular overlay protocol is how well does it achieve the aforementioned gain. There are several metrics that allow for objective comparison of protocols in this regard. However this is not the only point of view to provide a valuable evaluation of the multicast overlay solutions. One of the important aspects of the modern group communication such as the IPTV or teleconferencing is the dynamic nature of the users’ participation. A particular group may be joined and left by multiple users at a very frequent rate which is critical to the resources management as well as to maintaining the integrity of the abstract communication structure, e.g. a tree spanning all the participants. In such case two major classes of the evaluation criteria emerge: the statical and the dynamical ones. They’re both very important and interdependent, however the means to measure them may differ significantly. In this article a wide variety of the multicast overlay protocols have been analysed and two of them have been chosen to be compared. The stress of the evaluation has been put on the dynamic aspects of the multicast overlay protocols operation.","PeriodicalId":222283,"journal":{"name":"International Symposium on Communication Systems, Networks and Digital Signal Processing","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128780068","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}

{"title":"Hardware implementation of elliptic curve digital signature algorithm (ECDSA) on Koblitz curves","authors":"Nabil Ghanmy, N. Khlif, L. Chaari, L. Kamoun","doi":"10.1109/CSNDSP.2012.6292648","DOIUrl":"https://doi.org/10.1109/CSNDSP.2012.6292648","url":null,"abstract":"This paper presents Elliptic Curve Digital Signature Algorithm (ECDSA) hardware implementation over Koblitz subfield curves with 163-bit key length. We designed ECDSA with the purpose to improve performance and security respectively by using elliptic curve point multiplication on Koblitz curves to compute the public key and a key stream generator “W7” to generate private key. Different blocs of ECDSA are implemented on a reconfigurable hardware platform (Xilinx xc6vlx760-2ff1760). We used the hardware description language VHDL (VHSIC Hardware Description Language) for compartmental validation. The design requires 0.2 ms, 0.8 ms and 0.4 ms with 7 %, 13 % and 5 % of the device resources on Slice LUT for respectively key generation, signature generation and signature verification. The proposed ECDSA implementation is suitable to the applications that need: low-bandwidth communication, low-storage and low-computation environments. In particular our implementation is suitable to smart cards and wireless devices.","PeriodicalId":222283,"journal":{"name":"International Symposium on Communication Systems, Networks and Digital Signal Processing","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123755777","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}

{"title":"Intelligent Reflecting Surface - aided UAV Communications: A survey and Research Opportunities","authors":"Anas Alkhatieb, Xingwang Li, Ramez Alkhatib, Khaled Maaiuf Rabie, G. Nauryzbayev","doi":"10.1109/CSNDSP54353.2022.9908061","DOIUrl":"https://doi.org/10.1109/CSNDSP54353.2022.9908061","url":null,"abstract":"The sixth-generation (6G) wireless communication network needs to achieve very high data rates, extremely low latency, high reliability, fully connected coverage, and energy efficiency. Unmanned aerial vehicles (UAVs) are considered as promising new paradigm to the future of communications. However, limited battery capacity is a barrier to the effective spread of such solutions. Intelligent reflective surfaces (IRSs) that can reconFigure their reflection properties and electromagnetic absorption in real-time offer unparalleled opportunities to improve the wireless communication experience in difficult environments. In this respect, we highlight various use cases, research opportunities, and challenges for optimizing and designing wireless networks. Specifically, IRS carried by UAVs can meet important objectives in terms of future communications networks.","PeriodicalId":222283,"journal":{"name":"International Symposium on Communication Systems, Networks and Digital Signal Processing","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123780037","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}

{"title":"A 12-channal 120-Gb/s 0.18-μm CMOS optical receiver front-end amplifier","authors":"Wenyuan Li, Jie Xu, Rui Guo","doi":"10.1109/CSNDSP.2014.6923982","DOIUrl":"https://doi.org/10.1109/CSNDSP.2014.6923982","url":null,"abstract":"A 12-Channal 120-Gb/s optical receiver analog front-end (AFE) design that includes a transimpedance amplifier(TIA) and a limiting amplifier (LA) is demonstrated to require less chip area and is suitable for both low-cost and low-voltage applications. The AFE is stimulation using a 0.18μm CMOS process. In order to avoid off-chip noise interference, the TIA and LA are dc-coupled on the chip instead of ac-coupled though a large external capacitor. An isolation structure combined with P+ guard-ring (PGR), N+ guard-ring (NGR), and deep-n-well (DNW) for parallel amplifiers is employed to reduce the crosstalk and suppress the substrate noise coupling effectively. The tiny photo current received by the receiver AFE is amplified to voltage swing of 400. The results indicate that, with a photodiode parasitic capacitance of 500fF. Post-layout simulations demonstrate that a single channel optical receiver front-end amplifier achieves conversion gain of 91.6 dB and -3 dB bandwidth of 8.7 GHz. Operating under a 1.8V supply, circuit power dissipation is 1140 mW and its sensitivity is 18.5μA for BER of 10-12 and the chip size is733μm × 3226μm.","PeriodicalId":222283,"journal":{"name":"International Symposium on Communication Systems, Networks and Digital Signal Processing","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127753858","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}