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2021 IEEE Technology and engineering Management Conference - Europe, TEMSCON-EUR 2021

作者： Kristiadi, Ignatius Daru Nashiruddin, Muhammad Imam Sudjai, Miftadi Telkom University Graduate Program of Regulation and Management of Telecommunication School of Electrical Engineering Bandung Indonesia School of Electrical Engineering Bandung Indonesia Telkom University Bandung Indonesia

ISBN: (纸本)9781665440912

Indonesia, a maritime country and one of the biggest archipelagic countries globally, has complex issues regarding the distribution of broadband access throughout their regions. On the other hand, Indonesia's broadband needs are growing rapidly in this digital era, no exception for the Indonesian government. The High Throughput Satellite (HTS) can be the best solution to overcome the inequality of network connectivity distribution across Indonesia. This paper discussed the techno-economic analysis of advanced HTS for Indonesian Government multifunctional services. The objective is to give an overview concerning the potential investment of advanced HTS with specifications in the Ku-Band frequency spectrum from a techno-economic perspective for the Indonesian government. The result shows that the possible capacity generated by Kuband HTS is sizeable, around 35.51 - 319.26 Gbps. Thus, it is good technical potential for fulfilling the Indonesian government's enormous capacity demand for broadband access. Then, from an economic aspect the NPV of the investment is 32.2 million USD, IRR shows 15.71% greater than MARR of 15%. Then, the payback period reached by this project is estimated 8 years 6 months with the profitability index of this project is 1.03. Therefore, the economic analysis result concludes that it can be categorized as a feasible Indonesia project initiative. © 2021 IEEE.

关键词： Investments

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A comparative study for radioelectric coverage models applied to mobile communicaton systems performance analysis 8

A comparative study for radioelectric coverage models applie...

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8th IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, APWC 2018

作者： Reis, Alysson Lourenco Do Rego, Cassio Goncalves Lopez, Diego Camilo Tami Nunes, Marcelo Lucio Regional Management of Minas Gerais Brazilian National Telecommunication Agency Anatel Graduate Program in Electrical Engineering Federal University of Minas Gerais UFMG Belo Horizonte Brazil Graduate Program in Electrical Engineering Federal University of Minas Gerais UFMG Belo Horizonte Brazil Regional Management of Minas Gerais Brazilian National Telecommunication Agency Anatel Belo Horizonte Brazil

ISBN: (纸本)9781538667651

The highlight of this paper is to find the best performance provided by a certain propagation model indicated by the correlational analysis between predicted data and field measurements. An analysis of the radio coverage for mobile networks was made, based on base station parameters provided by mobile system operator in the system of the Brazilian National telecommunication Agency (Anatel). Due to the availability of high resolution data for the representation of the environment, it was possible to perform a comparative analysis of different prediction models associated to diffraction methods. Still was performed a massive measurement campaign followed by data treatment, for support an accurate comparative analysis of radio propagation effects. © 2018 IEEE.

关键词： Diffraction

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Compliance of Non-GSO Satellite with Radio Regulations Regarding to Interference with GSO Earth Stations. Case Study: Starlink and Telkom 3S 8

Compliance of Non-GSO Satellite with Radio Regulations Regar...

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8th International Conference on Information Technology, Information Systems and Electrical engineering, ICITISEE 2024

作者： Hidayati, Rizki Sutyarjoko, Meiditomo Wijanto, Heroe Graduate Program of Regulation and Management of Telecommunication School of Electrical Engineering Telkom University Bandung Indonesia Regulation and Management of Telecommunication School of Electrical Engineering Telkom University Bandung Indonesia The University Center of Excellence for Intelligent Sensing-IoT School of Electrical Engineering Telkom University Bandung Indonesia

ISBN: (纸本)9798350368970

This research aims an analyze of the interference analysis of the implementation of Telkom-3S and Starlink in Indonesia at downlink Ku-band Frequency based on the epfd calculation. This research conducts an analysis of the effect of avoidance angle on the interference caused by non-GSO satellites, it explores a concept concerning a victim GSO earth station. We use TLE to determine the number of Starlink that visible on the antenna ES of Telkom 3S. Based on the results of the calculations using an avoidance angle 0°- 80°, the higher of avoidance angle, the lower level of epfd and we also recognize that the epfd analyzed exceeds the interference limit suggested by ITU-R article 22 and based on the analysis of the epfd calculation using several avoidance angles, we recommend for Starlink to transmit the power level when the avoidance angle at 10° of ES Telkom 3S. © 2024 IEEE.

关键词： Satellite ground stations

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Enhancement of Accuracy For UWB Indoor Positioning Using Support Vector Regression 13

Enhancement of Accuracy For UWB Indoor Positioning Using Sup...

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13th IEEE International Conference on Communication, Networks and Satellite, COMNETSAT 2024

作者： Syathirah, Andi Sitti Munadi, Rendy Hapsari, Gita Indah Telkom University Graduate Program of Regulation and Management of Telecommunication School of Electrical Engineering Jl. Telekomunikasi. 1 Terusan Buahbatu Jawa Barat Bojongsoang Indonesia

ISBN: (纸本)9798350368086

Ultra-Wide Band (UWB) is a wireless technology that utilizes frequencies with a wide bandwidth to provide coverage and positioning with centimeter-level accuracy. This technology has been widely applied in various fields, such as activity recognition, indoor localization, and through-wall radar. One of the main advantages of UWB is its ability to determine the location of objects with an accuracy of up to 10 cm, making it ideal for tracking moving assets in complex and space-sensitive environments. In this study, a UWB-based positioning system uses a minimum of three anchors and one tag to measure the distance between devices. However, some conditions can reduce the measurement accuracy. To overcome this, this study proposes the use of the Support Vector Regression (SVR) algorithm to improve the accuracy of the system's positioning. SVR is a regression method that supports linear and non-linear regression, with the aim of finding the optimal hyperplane that minimizes prediction errors. The results of the study show that UWB combined with SVR can provide significant accuracy, with a Mean Absolute Error (MAE) of 17 cm on the X coordinate and 19 cm on the Y coordinate, and a Mean Squared Error (MSE) of 4 cm on the X coordinate and 5 cm on the Y coordinate in Line of Sight (LOS) conditions which under 20 cm. This confirms that the combination of UWB and SVR is an effective approach in improving the accuracy of indoor positioning. © 2024 IEEE.

关键词： Ultra-wideband (UWB)

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An unsupervised approach to improve contrast and segmentation of blood vessels in retinal images using CLAHE, 2D Gabor wavelet, and morphological operations

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Research on Biomedical engineering 2020年第1期36卷 67-75页

作者： da Rocha, Douglas Abreu Barbosa, Ana Beatriz Lordeiro Guimarães, Daniela Silva Gregório, Leonardo Miranda Gomes, Luiz Henrique Nacife da Silva Amorim, Luciana Peixoto, Zélia Myriam Assis Graduate Program in Electrical Engineering Pontifical Catholic University of Minas Gerais–PUC Av. Itau 525 Dom Cabral CEP Belo HorizonteMG30535-012 Brazil Polytechnic Institute of PUC Minas–Electronic and Telecommunication Engineering Course Pontifical Catholic University of Minas Gerais–PUC Belo HorizonteMG Brazil

Purpose: Retinopathies are the leading cause of eyesight loss, especially among diabetics. Due to the low contrast of blood vessels in fundus images, the visual inspection is a challenging job even for specialists. In this context, this work aims to implement image processing techniques to support contrast enhancement and segmentation of retinal blood vessels. Methods: The initial proposal consisted only of green channel separation, contrast limited adaptive histogram equalization, and 2D Gabor wavelet and mathematical morphology. The new proposal includes the edge and mask detection and the vessel enhancement 2D to preserve image’s characteristics. The development and validation of this work, in MatLab® environment, involved 40 images from Digital Retinal Images for Vessel Extraction (DRIVE), 20 images from Structured Analysis of the Retina (STARE), and 45 images from High-Resolution Fundus (HRF) database. Results: In the unsupervised method context, the proposal presented the best performance regarding sensitivity and second place for balanced-accuracy on all databases. A subjective validation involving eleven ophthalmology professionals showed higher levels of acceptance (above 80%) after contrast limited adaptive histogram equalization (CLAHE) and vessel enhancement 2D steps and 75.5% for overall quality system. Conclusion: The main contributions refer to the inclusion of techniques for automatic mask detection, image edge removal, and suppression of vessels background to improve the retinal vessels segmentation process. In addition, this work made a computational interface named "Retinal Lab - A Tool for Fundus Image Analysis" available, which permits the users to adjust the contrast and segmentation of blood vessels in retinal images. © 2020, Sociedade Brasileira de Engenharia Biomedica.

关键词： Mathematical morphology

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A portable and low cost solution for EMG using ZigBee, GPRS and Internet to Biomedical applications

A portable and low cost solution for EMG using ZigBee, GPRS ...

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19th IMEKO TC4 Symposium - Measurements of Electrical Quantities 2013 and 17th International Workshop on ADC and DAC Modelling and Testing

作者： Silva, D.K.N. Sato, R.M.V. Castro, A.L.S. Electrical Engineering Post Graduate Program Av. Augusto Correa 01 66075-110 Belém - Pará Brazil Faculty of Computer and Telecommunication Engineering Av. Augusto Correa 01 66075-110 Belém - Pará Brazil

ISBN: (纸本)9781629931890

This paper presents a prototype of an acquisition board of electromyographic signals (EMG);an embedded portable, wireless and low cost solution. The system is composed of an EMG acquisition board, Zigbee modules and a device named GPRSx. After acquiring the EMG signal, it is sent through ZigBee wireless technology to GPRSx device. The GPRSx device sends the EMG signal to a server on the Internet by using GPRS wireless technology. Thus, the EMG signal is displayed in a graph on a remote computer. The results are very promising and may serve as a reference in studies for the biomedical area.

关键词： Costs

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Soil Water Content Estimation over Plantation Area Using FMCW Radar

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Progress In Electromagnetics Research B 2023年 101卷 155-173页

作者： Ridhia, Fildha Pramudita, Aloysius Adya Suratman, Fiky Y. Graduate Program of Electrical Engineering Department Telkom University Indonesia Telecommunication Engineering Department Telkom University Indonesia Electrical Engineering Department Telkom University Indonesia

In plantation areas, soil conditions affect the crop's quality. One of the crucial elements in the soil for plant survival is soil water content (SWC). Radar system has advantages that can be implemented for measuring SWC in plantation areas. A radar system operates by utilizing electromagnetic waves to obtain the dielectric characteristics of the soil. However, the presence of tea plants has become an obstacle to the radar wave propagation toward the soil layer. Re ected signal, which is in uenced by the presence of vegetation, makes the estimation of SWC inaccurate. Consequently, the estimation of SWC needs to consider the vegetation's effect. This study uses an FMCW radar system, which operates at a frequency of 24 GHz. A layer medium propagation model is proposed in this study to prove the relationship between the re ected signal and the SWC. The re ection coefficient extracted from the radar signal is used to estimate the SWC. The vegetation propagation constant was obtained from the average field measurement results. The gravimetric method is used to validate the SWC estimation in vegetation's presence using the radar system. The results of the field experiments showed that the proposed method succeeded in estimating the SWC by considering the presence of vegetation with an average error of 3.57%. The proposed method has the potential to be applied to plantation areas. © 2023, Progress In Electromagnetics Research B. All Rights Reserved.

关键词： Vegetation

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Frequency Band Analysis and Spectrum Pricing for High Throughput Satellite in Indonesia

Frequency Band Analysis and Spectrum Pricing for High Throug...

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International Conference on Wireless and Telematics (ICWT)

作者： Saenab Ramadhani Heroe Wijanto Miftadi Sudjai Graduate Program of Regulation and Management of Telecommunication School of Electrical Engineering Telkom University Bandung Indonesia Regulation and Management of Telecommunication School of Electrical Engineering Telkom University Bandung Indonesia

Ku-band and Ka-band are frequency bands that are widely used for high throughput satellites, in Indonesia Ku-band have been used in several types of satellite services to support bandwidth limitations in the C-band. For this reason, a comparative study of Ku-band and Ka-band was carried out to ensure that the two frequency bands can be used in Indonesia's tropical climate and further evaluate the existing regulations for the implementation of HTS in Indonesia. The results of this study show that Ku-band and Ka-band can be used for HTS satellites in Indonesia. All communication links tested showed C/N values higher than the minimum requirements of C/N. Although both frequency bands can use in Indonesia, in terms of economy and efficiency, Ka-band is greater than Ku-band, the availability of wide bandwidth makes the throughput produced by Ka-band more than Ku-band. Capacity measurement simulation is also carried out with two frequency reuse schemes where higher throughput is present at 8 spot beams per cluster scheme. The scenario requires at least nine times frequency reuse to cover the entire region of Indonesia with total throughput on Ka-band 123.02 Gbps under normal sky conditions and 55.56 Gbps under rain sky conditions. The regulation review process resulted in suggestions for changes to the bandwidth cost index to be used in setting spectrum prices for the use of HTS. The need for this change is based on the consideration that bandwidth cost index was previously the base price for satellite transponders with a small bandwidth and HTS satellites are sensitive bandwidth technology.

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Absolute Gradient Algorithm for Adaptive IIR Notch Filter

Absolute Gradient Algorithm for Adaptive IIR Notch Filter

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International Conference on Electrical engineering/Electronics, Computer, telecommunications and Information Technology, ECTI-CON

作者： A. Nosan R. Punchalard The Computer Engineering Graduate Program Faculty of Engineering Mahanakorn University of Technology Thailand Department of Telecommunication Engineering Mahanakorn University of Technology Bangkok Thailand

The gradient algorithm used absolute value of error signal as a criterion to adjust the filter coefficient of adaptive IIR notch filter is presented in this paper. The objective is to estimate or track the frequency of a single sinusoidal signal corrupted by additive white Gaussian noise. The proposed algorithm can solve the problem of selecting an initial condition as met in the previous method. Moreover, it also has a high convergence speed.

关键词： IIR filters Adaptive filters Filtering algorithms Frequency estimation Convergence Signal processing algorithms Mathematical model

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Performance evaluation of D3LS and NCLS smart antenna in mobile communications

Performance evaluation of D3LS and NCLS smart antenna in mob...

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2012 17th International Symposium on Antennas and Propagation, ISAP 2012

作者： Boonpoonga, Akkarat Nilsuwan, Phichet Tagapanij, Jukkrit Sirisuk, Phaophak Department of Electrical and Computer Engineering Faculty of Engineering King Mongkut's University of Technology North Bangkok Bangkok Thailand Electrical Engineering Graduate Program Faculty of Engineering Mahanakorn University of Technology Bangkok Thailand Department of Telecommunication Engineering Mahanakorn University of Technology Bangkok Thailand International College King Mongkut's Institute of Technology Ladkrabang Bangkok Thailand

ISBN: (纸本)9784885522703

A smart antenna was proposed to improve wireless communication systems. The smart antenna may comprises direction-of-arrival (DOA) estimation and/or adaptive antenna. The DOA estimation technique is used to estimate direction of transmitted signals. An adaptive antenna has ability of suppressing undesired signals namely interference or jammers in specific directions while receive only the desired one. There are a number of methods proposed to conduct in such way, including multiple signal classification (MUSIC), least mean squares (LMS), sample matrix inversion (SMI), recursive least squares (RLS), and their derivative forms as seen in the literatures in [1]. These methods require a training sequence or known information for adaptation and/or DOA estimation. Although a constant modulus algorithm (CMA) was proposed without the need of training sequence, it has a slow convergence. © 2012 IEICE.

关键词： Multiple signal classification

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