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All Journal TELKOMNIKA (Telecommunication Computing Electronics and Control) Journal of Information Technology and Computer Science Journal of Environmental Engineering & Waste Management IT For Society : Journal of Information Technology
Cutifa Safitri
President University
Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Environmental Science

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OFDM synchronization system using wavelet transform for symbol rate detection Masaru Sawada; Quang Ngoc Nguyen; Mohammed Mustafa Alhasani; Cutifa Safitri; Takuro Sato
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 18, No 3: June 2020
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v18i3.14834

Abstract

In radio communications, using wavelet signal analysis to recover the symbol rate timing clock of orthogonal frequency-division multiplexing (OFDM) is a new approach that can tolerate signal distortion from intersymbol interference (ISI) and intercarrier interference of encoding digital data on multiple carrier frequencies. Typically, the reception synchronization with wavelet signal analysis in OFDM can improve the performance over the fourier transform-based OFDM. However, a synchronization procedure that is stable against distortion and noise is essential to diminish the symbol synchronization establishment and operation sampling period. In this paper, we propose an OFDM synchronization system and analyze the impact of the wavelet denoise procedure on the OFDM system, which extracts the symbol rate of the OFDM frame. The evaluation results show that the proposed system can optimize the frequency window size to enable an efficient timing and frequency offset estimation with high and stable performance in terms of bit error rate (BER) and Frame Error Rate (FER) especially when the value of EbN0 (a normalized signal-to-noise ratio SNR measure) is greater than 8 dB, thanks to the wavelet transform.
Alternative Technologies for Marine-Coastal Environment Debris Monitoring: A Review Mia Galina; Cutifa Safitri
Journal of Environmental Engineering and Waste Management Vol 6, No 2 (2021)
Publisher : President University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33021/jenv.v6i2.3381

Abstract

Abstract: The problems in the marine and coastal environment have aroused the attention of many countries in the world. According to [1], it is estimated that every year eight million tons of debris find their way into the world's oceans, thus disturbing aquatic and marine ecosystems. Particularly in the case of coastlines, many studies show that the majority of marine litter (60-80%) consists of plastic [2].   The objectives are to evaluate the critical issues in regards to marine environment waste monitoring and to track the development of technology used in the field of marine and coastal debris monitoring problems over the last two decades. The method of this research is by investigating the topic that is quite a lot raised as research related to coastal and marine waste and the distribution of technology implemented for coastal and marine debris. The results show that waste in coastal and marine areas is a problem that needs to be solved immediately. The data relating to the generation of waste flowing into the ocean is dynamic, moving every day, depending on the generation of the generated waste and its accumulation and drifting in the ocean. The large amount of information collected from higher views (such as satellite views) provides important insights for understanding and identifying plastic waste debris pollution and its movement. The conclusion: Regardless of the application, an integrated technical solution is required, which can be sensors, communication devices, data packet transmission from client devices to servers with appropriate application protocols, or a combination of several technologies
Railway Communication Network: A Case Study for Mobile Quality of Service Cutifa Safitri
IT for Society Vol 5, No 2 (2020)
Publisher : President University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (928.796 KB) | DOI: 10.33021/itfs.v5i2.1273

Abstract

Trains, nowadays, are becoming a popular choice for a fast, comfortable, and cheaper way to travel. Train’s passengers on a long journey tend to occupy their time by accessing content through mobile devices. Cisco predicted Smartphone traffic will exceed PC traffic by 2020. With the increasing growth of content exchanged, there is a rising demand for managing content for mobile users. Without a significant improvement in railway network infrastructure, the Quality of Service (QoS) for communication in-carriage will degrade, compromising passengers’ experience in mobile communication. Moreover, due to the nature of the railway network that has to support a large group of users in a long journey period, the requested contents are usually bandwidthintensive with the need for continuous mobility support. In order to ensure mobile Quality of Service (mQoS), intelligent & dynamic content management is required to facilitate content distribution. Currently implemented a method to manage mobility heavily relies on a host-to-host connection. A proposal by Future Internet Architecture introduces content-centric networking with built-in mobility. The present paper consider scalability and QoS in high-speed mobility. Therefore, by using a content-centric network proposal, this research aims to propose railway communication networks that provide the solution of mobile QoS.
Post-Pandemic Hotel Decision Criteria Analysis Using Decision Making Methods Prima Melati Sukma; Cutifa Safitri
Journal of Information Technology and Computer Science Vol. 7 No. 1: April 2022
Publisher : Faculty of Computer Science (FILKOM) Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25126/jitecs.202271388

Abstract

This paper proposes an optimized hybrid process of the Analytic Hierarchy Process with the Simple Additive Weighting method for hotel decision-making. This study is important as many sectors including tourism are striving in the post-pandemic era. The proposed hypothesis is proven through a study case of hotel selection which included four factors for the criteria in decision-making, namely price, facilities, class, and location. The supported literature review on the topic described both methods are still widely used for the decision-making process. This study critically analyzed the importance of the selected factors. The superiority of this approach is to measure the validity by considering the depreciated value. To validate our findings, a group of sampling is done by performing the hybrid methods. Calculated results revealed the proposed methods achieve the decision-making process, the hybrid AHP – SAW model was found to be an effective method for assessing the hotel selection process.
An Implementation of a Web-based Application with Personalized Learning Path and Seamless Single Sign-On for Self-paced Learning Akira Akira; Cutifa Safitri; Ronny Juwono
IT for Society Vol 8, No 2 (2023)
Publisher : President University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33021/itfs.v8i2.4823

Abstract

Abstract—Innovation is what enables humans to thrive.History will repeat itself without innovation, and humanity’shistory is far from ideal. One thing humans do have is the choiceof a bright future. It is up to us, the future leaders, to earn andachieve this future. This is why education is so important.Education brings more innovations and wisdom to the world. Asprospective leaders, it is a must to do whatever it takes to makeeducation more accessible, enjoyable, exciting, and engaging,allowing students to feel the joy of learning as we do. Ourresearch explores methods for the system design of an e-learningplatform, focusing on integrating personalized learning pathmanagement and the seamless Single Sign-On authenticationsystem. This paper contributes to the advancement of the fieldof educational technology by proposing a solution aimed atrevolutionizing the learning experience. By proposingpersonalized learning paths and the integration of a seamlessSingle Sign-On (SSO) system, this paper addresses the criticalchallenges surrounding conventional educational approaches
Co-Authors Akira Akira Masaru Sawada Mohammed Mustafa Alhasani Prima Melati Sukma Quang Ngoc Nguyen Ronny Juwono Takuro Sato