WSEAS TRANSACTIONS ON COMMUNICATIONS最新文献

{"title":"Signal Processing by Generalized Receiver Using DS-CDMA with STBC Technology in Multidimensional Systems over Fading Channels: Capacity and Error Probability","authors":"V. Tuzlukov","doi":"10.37394/23204.2020.19.15","DOIUrl":"https://doi.org/10.37394/23204.2020.19.15","url":null,"abstract":"The capacity and error probability of orthogonal space-time block codes (STBCs) are considered for the pulse-amplitude modulation (PAM), phase shift keying (PSK), quadrature-amplitude modulation (QAM) in fading channels. The suggested approach is based on employment of the generalized approach to signal processing in noise over the equivalent scalar additive white Gaussian noise channel with a channel gain proportional to the Frobenius norm of the matrix channel for the STBC. Using this effective channel, the capacity and probability of error expressions are derived for the PSK, PAM, and QAM modulation with space-time block coding. The Rayleigh, Rician and Nakagami fading channels are considered. As an application, these results are extended to obtain the capacity and probability of error for a multiuser direct sequence code-division multiple-access (CDMA) system constructed on the basis of the generalized approach to signal processing in noise employing the space-time block coding","PeriodicalId":330638,"journal":{"name":"WSEAS TRANSACTIONS ON COMMUNICATIONS","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128733022","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":"IOT Supported Security Considerations for Network","authors":"K. Thamizhmaran","doi":"10.37394/23204.2020.19.14","DOIUrl":"https://doi.org/10.37394/23204.2020.19.14","url":null,"abstract":"The current IP and other networks such as Power Smart Grids are fast evolving, thus resulting in diverse connectivity methodologies. This has led to the emergence of \"the Internet of Things” (IoT) methodologywhose goal is to transform the current IP and related networks to Device-to-Device (D-2-D) basis. It will seamlessly interconnect the globe via intelligent devices and sensors of varying types, this resulting in voluminousgeneration and exchange of data in excess of 20 billion Internet-connected objects and sensors (things) by 2022.The resultant structure will benefit mankind by helping us make tough decisions as well as be provisioned ofbeneficial services. In this paper, we overview both IoT enabled network architecture as well as security forassociated objects and devices. We commence with a description of a generalized IoT enabled network's security architecture as well as how the various elements constituting them interact. We then describe an approachthat allows the protection of both constrained and unconstrained IoT devices through robust encryption as wellas authentication so that both can equally leverage from the same security framework, but still maintaining lowcomputational loads, by avoiding excessive computational operations.","PeriodicalId":330638,"journal":{"name":"WSEAS TRANSACTIONS ON COMMUNICATIONS","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127914225","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 Comparison of Proposed Scheme Coded DWT-OFDM System with that of Conventional OFDM","authors":"Simmi Garg, A. Sharma, A. Tyagi","doi":"10.37394/23204.2020.19.13","DOIUrl":"https://doi.org/10.37394/23204.2020.19.13","url":null,"abstract":"In this paper, we have investigated the Proposed scheme coded DWT-OFDM system in comparison to conventional OFDM system over AWGN channel. 16, 32, 64 – QAM and PSK modulation schemes have been considered to evaluate the system. Moreover, two different wavelets have been used for examining the system. Simulations are performed using MATLAB software. It is found that proposed scheme based DWT-OFDM system performs better than conventional OFDM system under all the considered modulation schemes","PeriodicalId":330638,"journal":{"name":"WSEAS TRANSACTIONS ON COMMUNICATIONS","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124691151","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 Modular Design Approach for Ka-Band Front-End Receiver of Synthetic Aperture Interferometric Passive Imager","authors":"G. Mehdi, M. Asif, Hu Anyong, J. Miao","doi":"10.37394/23204.2020.19.12","DOIUrl":"https://doi.org/10.37394/23204.2020.19.12","url":null,"abstract":"Electromagnetic Laboratory of Beihang University is engaged in the development of Ka-band synthetic aperture interferometric based passive imager named as BHU-2D-U. The imager is intended for detection of concealed weapons on human body. Noise figure of front-end receiver dictates the dynamic range and consequently the imaging performance of the imager. A modular design approach is presented to obtain improved noise figure as compared to the previous work. Additionally, the modular design gives a flexibility to adopt any desired receiver gain, instantaneous bandwidth, and noise figure and image rejection suppression. The measured gain, noise figure and image rejection is 42 dB, 4.1 dB and 60 dB respectively with 80 dB excellent spurious free spectral response. The reconstructed image performance of the imager is found satisfactory","PeriodicalId":330638,"journal":{"name":"WSEAS TRANSACTIONS ON COMMUNICATIONS","volume":"247 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124725598","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":"Network Monitoring of the MHT Company Using the DUDe","authors":"Fatima Sapundzhi, Krasimir Yordanov","doi":"10.37394/23204.2020.19.11","DOIUrl":"https://doi.org/10.37394/23204.2020.19.11","url":null,"abstract":"In the current study we present a monitoring of the MHT network system by using the DUDe. It is an effective monitoring system for administrators covering services to every client. The administrators are constantly striving to maintain smooth operation of their networks. The system enables to monitor the status changes particularly outside the monitoring area. In the observed system, we use the Open Shortest Path First protocol, which is based on the link state routing protocol concept and uses Dijkstra’s shortest path first routing algorithm. An alert system is built to the MHT network. It can be used to supervise the network and can report the state of the network by using an alert system in the monitoring area.","PeriodicalId":330638,"journal":{"name":"WSEAS TRANSACTIONS ON COMMUNICATIONS","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134131701","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":"Validation Methods For Reflection Factor High Frequency","authors":"N. Fezai, Abdessattar Ben Amor","doi":"10.37394/23204.2020.19.10","DOIUrl":"https://doi.org/10.37394/23204.2020.19.10","url":null,"abstract":"Network analysis is the method by which manufacturers and designers measure the electrical performance of components and circuits used in more complex systems. When these systems are transmitting signals with information content, we are most concerned with getting the signal from one point to another with minimum distortion and maximum efficiency. Vector network analysis is a method of accurately characterizing such components by measuring their effect on the amplitude and phase of swept-frequency and swept-power test signals. In the field of the measurement of S-parameters using a vector network analyzer, the pertinent question is how to calibrate this measuring device high frequency. In fact, calibration is defined by ISO/CEI 17025 “…set of operations that establish, under specified conditions, the relationship between values of quantities indicated by a measuring instrument or measuring system, or values represented by a material measure or a reference material, and the corresponding values realized by standards.”[1] Indeed, calibration is critical to making good VNA S-parameter measurements by given the matrix and complex nature of the measurand, the frequency range and the range of the potentially measured values. While the VNA is a highly-linear receiver and has sufficient spectral purity in its sources to make good measurements, calibration is not directly feasible then we use the notion of calibration, which is to automatically correct the measurement errors. This calibration then allows resetting the response of the instrument to a true predicted value calculated from the measured raw value and the error coefficients determined by the calibration. This correction made to the meter can then be seen as an improvement in its accuracy. So, the calibration of VNA is a validation method to insure the Traceability to SI according to the parameter reflection factor. The topic of this paper is to present a method of calibration of VNA \"1- PORT\" in order to quantify the terms of errors systematic and validate the primary method “compensated reflectometer” , enrich the park of calibration methods and to meet requirements of ISO / IEC 17025 (Part7.2.2 validation of methods) [1].","PeriodicalId":330638,"journal":{"name":"WSEAS TRANSACTIONS ON COMMUNICATIONS","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126919180","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":"An Analogue Multiplier using CNTFET Technology","authors":"Seyedehsomayeh Hatefinasab","doi":"10.37394/23204.2020.19.8","DOIUrl":"https://doi.org/10.37394/23204.2020.19.8","url":null,"abstract":"The endeavor to overcome problems of complementary metal oxide semiconductor technology makes the advent of Carbon nanotube field effect transistor (CNTFET). Improvement of structure transistor CNTFET makes higher mobility and electrostatics of gate electrons. Therefore, many analog circuits are now designed based on CNTFET technology. This paper presents a low power current mode four-quadrant analog multiplier based on CNTFET and CMOS technologies. All simulations were done with the synopsys Hspice simulator using 32nm CNTFET model from Stanford University and 32nm CMOS from PTM library at a supply voltage of 3.3 v. It was shown that the simulation of a multiplier based on CNTFET technology performs better than a multiplier based on CMOS technology.","PeriodicalId":330638,"journal":{"name":"WSEAS TRANSACTIONS ON COMMUNICATIONS","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122575427","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":"LEO Hybrid Satellite Constellation Design Based on Multi-purpose Genetic Algorithm to Optimize Cost and Reliability of Global Coverage","authors":"Saeld Kohani, P. Zong","doi":"10.37394/23204.2020.19.9","DOIUrl":"https://doi.org/10.37394/23204.2020.19.9","url":null,"abstract":"Assessing the reliability of systems plays an effective role in the constellation design. Genetic Algorithm can be applied for the optimization design of satellite constellation, which are imperative in various fields like communication, surveillance and navigation. Opposite goals, such as optimizing performance and reducing the number of satellites in constellations along with low cost of construction and launch, have been analyzed in this paper. In the design of constellations, launching and replacing unhealthy satellites to avoid breakdown, and the time costing has a major impact on the level of system reliability performance. A method to design hybrid constellation for communication and navigation is proposed in this paper, it takes coverage capability and precession into consideration. According to LEO constellation, The issue of optimizing the number of satellites and other effective panels in constellation design has been discussed. The genetic algorithm is designed to the hybrid LEO constellations design by using a methodology of coverage constellation. It provides the optimal solutions for enhancing capability of communication and navigation. The simulation results confirm the performance of the proposed algorithm and indicates that it is feasible and effective Accordingly, in this paper, after designing the constellations using the genetic algorithm, we draw the final constellation diagram block and evaluating the conspicuous performance and reliability at the time of request.","PeriodicalId":330638,"journal":{"name":"WSEAS TRANSACTIONS ON COMMUNICATIONS","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129646885","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":"Mathematical Modeling and Optimization of Parameters of Apodized Bragg Gratings","authors":"M. Kalimoldayev, A. Kalizhanova, W. Wójcik, G. Kashaganova, S. Amirgaliyeva, A. Dasibekov, A. Kozbakova, Zhalau Aitkulov","doi":"10.37394/23204.2020.19.7","DOIUrl":"https://doi.org/10.37394/23204.2020.19.7","url":null,"abstract":"In the result of carried out researches with simulation usage there have been obtained the dependence of the spectral reflectivity characteristics of Bragg gratings on the grating length and on the local changes of the fiber core refraction index, as well, that the spectral reflectivity thereof increases along with the grating length enlargement. Outcomes of mathematical modeling in MATLAB medium and carried out analysis of the light emission in the Bragg grating fiber structure clearly denote the possibility of time impulses control magnitudes extension. In the end it has been concluded, that we can precisely control the dispersive claddings in the fiber-optical line through appropriate selection of the Bragg fiber gratings apodization parameters.","PeriodicalId":330638,"journal":{"name":"WSEAS TRANSACTIONS ON COMMUNICATIONS","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129934712","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 Agent-based Technique For Virtual Machine Resource Allocation For Energy-Efficient Cloud Data Centres","authors":"Ogechukwu Okonor, M. Adda, A. Gegov","doi":"10.37394/23204.2020.19.5","DOIUrl":"https://doi.org/10.37394/23204.2020.19.5","url":null,"abstract":"In recent years, cloud computing technology has emerged as a promising solution to many medium and small scale business enterprise. It leverages cost, encourages collaboration, and it is so flexible to use. Despite its attractive features, it still has some challenging issues such as power consumption rate. Although significant efforts have been devoted to optimising power usage through scheduling and virtualisation, it though remains a challenging problem. This paper introduces a new model on how to reduce the power consumption during live virtualisation and schedule based on intelligent mobile agent technology. The simulation results show that the proposed algorithm minimises power consumption used in the data centre at each stage by more than 30% compared to the current state-of-the-art techniques.","PeriodicalId":330638,"journal":{"name":"WSEAS TRANSACTIONS ON COMMUNICATIONS","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123029375","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}