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All Journal Majalah Ilmiah Teknologi Elektro
NMAE Dewi Wirastuti
Universitas Udayana
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering

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The Analysis of the Effect and Reduction of Carrier Frequency Offset in Orthogonal Frequency Division Multiplexing (OFDM) Multiple Input Multiple Output (MIMO) Willy Sucipto; I Nyoman Pramaita; NMAE Dewi Wirastuti
Jurnal Teknologi Elektro Vol 19 No 2 (2020): (Juli - Desember) Majalah Ilmiah Teknologi Elektro
Publisher : Program Studi Magister Teknik Elektro Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/MITE.2020.v19i02.P14

Abstract

Abstract— The development of cellular telecommunication provides users to experience fast and stable transmission. This standard of transmission is proportional to the needs of the devices and systems used. We are currently in the fourth generation (4G) of cellular technology. The key technologies used in 4G are Orthogonal Frequency Division Multiplexing (OFDM) which uses the concept of orthogonality for bandwidth efficiency and Multiple Input Multiple Output (MIMO) which uses the concept of diversity to improve performance. But in implementation this system will have problems with the transmission channel. The problem that occurs is signal attenuation due to Carrier Frequency Offset (CFO). This CFO will cause the orthogonal character built from the OFDM system to experience a decline in performance. The decline in performance is due to the occurrence of Intercarrier Interference (ICI). To overcome this problem, the method used in this simulation are Improved Sinc Power Pulse (ISP) and Rectangular Pulse (REC). The results showed that ISP had a relatively better BER value than REC and without using the pulse shaping method. The minimum BER value obtained from the simulation is ISP with a value of 0.0001 while REC produces a value of 0.0006 and without pulse shaping produces a BER value of 0.0038.
EVALUASI LAYANAN BROADBAND CAMPUS DENGAN MENGGUNAKAN FRAMEWORK COBIT 4.1 Fajar Tri Prabowo; NMAE Dewi Wirastuti; I Nyoman Satya Kumara
Jurnal Teknologi Elektro Vol 16 No 2 (2017): (May - Agustus) Majalah Ilmiah Teknologi Elektro
Publisher : Program Studi Magister Teknik Elektro Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/MITE.2017.v16i02p06

Abstract

Abstract - Broadband campus is a high speed internet service with high transfer rate that implemented within the campus area. The sole purpose of this service is to optimize the internet network in certain area that is still lack of a high speed internet connection. This paper will ellaborate more on the evaluation of certain ongoing broadband campus service at Mahasaraswati University in Denpasar by using COBIT 4.1 Framework. This evaluation is intended to enhance the user effectiveness through existing services. This evaluation was conducted through certain mini-survey by using the broadband campus IT service by examining the university students satisfaction through series of interviews and questionnaires. The conclusion that was inferred through the surveys is that the broadband services within the university gain a subsequently low existing maturity level with 1.9 mark in the COBIT Framework scale. One of the major reason of why the service acquire low satisfaction level within the university is due the students in Mahasaraswati University did not manage to optimize the broadband campus service in the first place
Sistem Aplikasi Location Based Service untuk Pengembangan Kota Cerdas Agus Sukerta; Linawati Linawati; NMAE Dewi Wirastuti
Jurnal Teknologi Elektro Vol 14 No 1 (2015): (January - June) Majalah Ilmiah Teknologi Elektro
Publisher : Program Studi Magister Teknik Elektro Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/MITE.2015.v14i01p05

Abstract

One way to accomplish the smart city is by utilizing application that build interaction between society and the government while providing the benefits to all stakeholders. This application systems should be reached easily and relatively cheap for the society, and they can be used anytime, anywhere. This paper describes how to develop applications that implement the Location Based Services (LBS) for Development of Smart City to build the Public Complaints Service Application System (PCSAS). The PCSAS was designed, built and then tested. This PCSAS was built with Web-based Client-Server architecture. On the client side using a web interface or mobile with Android operating system. This application uses a valid e-mail as a condition of enrollment, while accommodating Social Media interface particularly Facebook and Twitter to get into the system. The result of the use of this application system was an interaction between the community and the government in handling public complaints. Location information problems in the field may soon be known precisely by coordinates, so that the handling can be done quickly and with sufficient preparation equipment based on the information of the real conditions in the field in the form of photos and videos that are included in the complaint.
Co-Authors Agus Sukerta Fajar Tri Prabowo I N Satya Kumara Linawati Linawati Nyoman Pramaita Willy Sucipto