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Articles 365 Documents
SIMULASI LINK BUDGET PADA SEL FEMTO TEKNOLOGI TELEKOMUNIKASI LTE (LONG TERM EVOLUTION) Utomo, Budi; Santoso, Imam; Z, Ajub Ajulian
Transmisi Vol 15, No 1 (2013): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (271.177 KB) | DOI: 10.12777/transmisi.15.1.13-18

Abstract

Abstrak   Teknologi sel femto pada LTE (Long Term Evolution) dapat meningkatkan kualitas sinyal di dalam ruangan karena penempatan stasiun pemancar sel femto yang berada di dalam ruangan. Dengan berkurangnya jarak antara stasiun pemancar, dalam hal ini yaitu FAP (Femtocell Access Point) dengan UE (User Equipment) maka kualitas sinyal di dalam ruangan diharapkan membaik. Namun, dengan digunakannya sel femto, timbul fenomena interferens antara sel makro dan sel femto, juga interferens antar sel femto.Kualitas sinyal (SINR) pada pengguna (downlink) baik dari sel femto atau sel makro akan dikaji berdasarkan perhitungan link budget dengan memperhitungkan fenomena interferens yang mungkin terjadi menggunakan perangkat lunak LabView2009. Dari hasil simulasi rugi propagasi indoor sel femto  memiliki nilai yang lebih rendah dari sel makro sebesar  85,8137dB sedangkan sel makro 144,4035dB. Nilai SINR sel femto downlink ketika tidak ada pengaruh dari sel makro, nilai SINR maksimum adalah 36,0838 dB dan nilai SINR terkecil adalah 20,0865 dB dan ketika terdapat sebuah sel makro dan FAP yang melayani pengguna berada di ruang lingkup sel makro tersebut maka nilai SINR terbesar menjadi hanya 23,3947 dB sedangkan SINR terkecil adalah 20,0863dB.   Kata kunci: femtocell, LTE, link budget, interferens, SINR. Abstract Femtocell LTE (Long Term Evolution) technology can increase signal coverage at indoor environment because the deployment of the femtocell base station is in the building. With a distance reducement between a femtocell base station (usually called FAP, Femtocell Access Point) with a user equipment (UE), the signal quality hopefully will be better. But, the deployment of femtocell emerges interference phenomenon between macrocell and femtocell, also interference between femtocells itself.Quality cues (SINR) at the user (downlink) from both femto cell or macro cell will be assessed by taking into account the link budget calculation possible interference phenomena using software LabView2009. From the results of simulations of indoor propagation loss femto cells have a lower value than the macro cells at 85.8137 144.4035 dB dB while the macro cell. Value SINR downlink femto cell when there is no influence of the macro cell, the maximum value is 36.0838 dB SINR and SINR value and the smallest is 20.0865 dB when there is a macro cell and FAP serving users are in the scope of the macro cell, the value SINR largest being only 23.3947 dB while the smallest SINR is 20.0863 dB.   Keywords: femtocell, LTE, link budget, interfernce, SINR.
KONSEP PEMROGRAMAN JARINGAN DENGAN MEMANFAATKAN MIDDLEWARE ORB (OBJECT REQUEST BROKER) Somantri, Maman
Transmisi Vol 7, No 2 (2005): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (50.751 KB) | DOI: 10.12777/transmisi.7.2.41-45

Abstract

Dalam pemrograman client server tingkat lanjut, adalah memungkinkan untuk membangun sebuah aplikasi dengan dasar platform pemrograman yang berbeda-beda. Dalam pemrograman jaringan biasa / konvesional, maka tidak akan mampu untuk mengkoneksikan dua atau lebih platform yang berbeda. Misalnya ada dua buah server aplikasi yang dibangun oleh masing-masing Java dan C++, sedangkan client-nya dibangun oleh aplikasi delphi. Untuk membangun aplikasi itu maka dibutuhkan sebuah lapisan yang bisa menghubungkan platform pemrograman  yang berbeda, lapisan yang dimaksudkan adalah diistilahkan sebagai?middleware?. Middleware pada tataran implementasi merupakan sebuah paket program instan yang dipakai pada suatu platform permograman tertentu, sedangkan pada tataran konsep, middleware merupakan sebuah lapisan untuk lalu lintas penghubung komunikasi antar objek dari sistem yang berbeda. Ada beberapa jenis middleware, seperti ORB (Object Request Broker), RMI (Remote Method Invocation), dan MOM (Message Oriented Middleware). Dalam tulisan ini akan dibahas tentang tinjauan konseptual untuk membangun sebuah aplikasi dengan memanfaatkan pemrograman jaringan dengan middleware. Middleware yang akan digunakan adalah ORB(Object Request Broker).Kata kunci: Middleware, ORB, CORBA
ANALISIS PERPINDAHAN KANAL KOMUNIKASI DALAM SATU BSC PADA SISTEM GSM BERDASARKAN DATA DRIVE TEST MENGGUNAKAN TEMS INVESTIGATION 4.1.1 Chalida, Luluk Arifatul; Santoso, Imam; Christyono, Yuli
Transmisi Vol 11, No 4 (2009): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (320.413 KB) | DOI: 10.12777/transmisi.11.4.183-192

Abstract

Mobile communications system created to meet the communication needs that can be done anywhere either when user is motionless or moving. To maintain the quality of services in a wide service area, coverage area is divided into smallest geographic units called cells. If the user moves from one area of the cell to another, then it needs an algorithm that guarantees the continuity of communications services. These algorithm is called a handover to a dedicated mode and the cell reselection for idle mode. In observing handoff algorithm, the operator did a drive test using computer and handset, which each had been equipped with special software, and GPS. This research analyze the problems related to the handoff algorithm, both when in idle mode or dedicated mode, including the causes, processes and things that influence it. Data acquisition is carried out through a drive test using software TEMS Investigaions GSM 4.1.1 with routes in the downtown area of Semarang. Drive test held on every Thursday and Sunday for three consecutive weeks starting on August 23, 2009 and each of day divided into three time allocation, ie morning, noon and night. The observed event include: cell reselection, handover, handover (intracell), handover failure and intracell handover failure. In addition Information Element that effected on the event are also observed, path loss criteria and cell reselection criteria for cell reselection, and received power, bit error rate and timing advance for the four other events. From the analysis is known that the assignment channel is triggered by the Information Element value that reaches a certain threshold value. For cell reselection, the both Information Element having equal influence. Information Element of the most influential for the handover and the handover failure is received power, whereas for two other events the most influential is the received bit error. After the detected value of the Information Element reaches a certain threshold, MSC will instruct the candidate cell to monitor and serving mobile station. Different process going on for handover (intracell), which after the information element value is known at a certain threshold, MS will move to another traffic channel in the same cell. If handover (intracell) was requested but could not be performed then handover based quality is tried the next time (if criterion is still given). When this handover also fails then BS toggles back and tries again a handover (intracell). In this drive test result there are 15 handover failures that may because no available traffic channel in candidate cell. There is only once handover intracell failure happened which may be caused by full traffic in candidate channel, but no cell reselection failure is found because this event doesn?t need traffic channel but only signaling channel. Keywords: handover, cell reselection, intracell, IE, TEMS
IMPLEMENTASI TEKNOLOGI AUGMENTED REALITY SEBAGAI PANDUAN SALAT BERBASIS SISTEM OPERASI ANDROID Rahman, Luthfi; Sofwan, Aghus; Christyono, Yuli
Transmisi Vol 19, No 2 April (2017): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (652.675 KB) | DOI: 10.12777/transmisi.19.2.89-94

Abstract

Salat adalah salah satu bentuk ibadah wajib umat Islam kepada Allah SWT. Suatu kewajiban bagi umat Islam melaksanakan salat wajib 5 waktu setiap harinya. Diperlukan pembiasaan dan pemahaman yang baik tentang tata cara salat agar sesuai dengan tuntunannya. Maka dari itu diperlukan sebuah aplikasi untuk membantu mereka yang ingin belajar salat dengan memanfaatkan perkembangan teknologi informasi, sehingga pembelajaran dapat dilakukan dengan mudah dan interaktif. Untuk mewujudkan gagasan tersebut, dilakukan sejumlah metode penelitian antara lain studi literatur, pengumpulan informasi tentang tata cara salat yang benar, perancangan aplikasi menggunakan UML, dan implementasi aplikasi menggunakan teknologi augmented reality. Hasil dari Penelitian ini adalah sebuah aplikasi yang menerapkan teknologi augmented reality sebagai panduan tata cara salat pada perangkat berjalan berbasis sistem operasi Android. Untuk memastikan aplikasi dapat berjalan dengan baik, dilakukan sejumlah pengujian dan pengamatan performa di sejumlah perangkat. Dengan begitu diharapkan umat Islam pada umumnya dan umat Islam yang masih awam pada khususnya dapat mempelajari tata cara salat yang benar dengan mudah.
EFISIENSI ENERGI LISTRIK KAMPUS UNDIP TEMBALANG Karnoto, Karnoto
Transmisi Vol 10, No 1 (2008): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (127.815 KB) | DOI: 10.12777/transmisi.10.1.38-42

Abstract

Energy is one part of the important in everyday life. The energy consumption especially electrics energy have to pay attention requirement and economics level.  So that electrics energy used as according to requirement. Thereby consumption  energy pay attention energy efficiency. This research is to evaluate usage consumption energy of Diponegoro University Tembalang Campus ( Faculty MIPA and FPIK, FKM, and FPsychology). This Benefit Research is to give alternative  solution subscribe PLN electrics or merger. Result of Research yielded is forth of the faculty of customer based on energy capacities attached in the reality still not yet as according to usage. Given by solution is Customer FMIPA can be achieved by down grading its tarrif-class ( from 345 KVA to 197 KVA)  and FPIK, FKM and F Psychology (240 KVA to 131 KVA).  Other Alternative is Merger of  FPIK, FKM And F Psychology with F MIPA.Keywords: Energy, Consumption, Efficiency, Capacity
ANALISIS KINERJA ZIGBEE (802.15.4) PADA PERUMAHAN MENGGUNAKAN NETWORK SIMULATOR 2 Agnawatri, Kurnia; Sukiswo, Sukiswo; Zahra, Ajub Ajulian
Transmisi Vol 18, No 1 Januari (2016): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (450.821 KB) | DOI: 10.12777/transmisi.18.1.8-14

Abstract

ZigBee/IEEE 802.15.4 adalah protokol jaringan nirkabel yang memiliki karakteristik yaitu daya dan data rate rendah, tingkat keamanan tinggi, selain bebas lisensi juga pengoperasiannya sangat mudah. Salah satu implementasi dari teknologi ZigBee adalah untuk sistem monitoring pada perumahan. Pada penelitian ini, akan dilakukan simulasi dan analisis komunikasi data antar node pada Wireless Sensor Network menggunakan protokol ZigBee. Node ZigBee pada simulasi ini dipasang di setiap rumah pada suatu perumahan membentuk jaringan tree. Simulasi dilakukan menggunakan software NS-2, kemudian dilakukan pengamatan terhadap parameter QoS meliputi delay, packet loss, throughtput dan PDR. Hasil simulasi menujukkan dengan meningkatnya nilia pathloss dan deviasi shadowing, mengakibatkan nilai delay dan packet loss cenderung naik, sedangkan nilai throughput dan PDR cenderung menurun. Nilai terbesar kenaikan rata-rata delay terjadi pada variasi deviasi shadowing dengan dimensi 130×130m2, yaitu sebesar 35,68%. Nilai terbesar kenaikan rata-rata packet loss terjadi pada variasi deviasi shadowing dengan dimensi 100×100m2, yaitu sebesar 44,76%. Nilai terbesar penurunan rata-rata throughput terjadi pada variasi deviasi shadowing dengan dimensi 130×130m2, yaitu sebesar 91,64%. Nilai terbesar penurunan rata-rata PDR terjadi pada variasi deviasi shadowing dengan dimensi 130×130m2, yaitu sebesar 23,89%.
PEMETAAN POSISI DAN ORIENTASI KURSI RODA CERDAS BERBASIS PRINSIP DEAD RECKONING Setiawan, Iwan; Akrom, Isnan Fauzan; Darjat, Darjat
Transmisi Vol 11, No 2 (2009): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (157.086 KB) | DOI: 10.12777/transmisi.11.2.77-83

Abstract

Smart wheelchairs is a kind of assistive technology implementation from mobile robot field. The main purpose of the system is enhance disable people mobility and guaranteeing safety aspect while wheelchair navigate around domestic environment. As a kind of semi autonomous smart navigation system, the smart wheelchair must be accommodate share control between automatic controller and the user (via joystic). The ultimate goal of this research is to know exactly the position and orientation of smart wheelchair using dead reckoning principle. To fulfill the goal, the smart wheelchair is equipt by quadrature rotary encoder for each wheels.From the experiments that we drawn, we have get some result: Position and orientation error will be larger for long duration of operation of wheelchairs. Fundamentally, these kinds of error result from systematic and non systematic error source. Keywords: encoder, dead reckoning, state chart, komunikasi serial, smart wheelchair
APLIKASI TRACER STUDY BERBASIS WEB PADA UNIVERSITAS DIPONEGORO Adi Soetrisno, Yosua Alvin
Transmisi Vol 21, No 4 Oktober (2019): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1407.888 KB) | DOI: 10.14710/transmisi.21.4.%p

Abstract

This study aims to integrate the alumni information system which has not been integrated at Diponegoro University. The alumni information system previously encountered problems, namely the absence of alumni database application standards, and there was no policy requiring students to fill and update the alumni database system. The application designed in this study can be a medium that connects faculties and also requires that each alumni can fill in the data in the database. The system development method used in developing this system is the V model. This application has the facility to update work data and first salary when working. Information entered into the application can facilitate primary data collection for accreditation purposes. In this application alpha testing is done using the blackbox testing method and in beta testing using a questionnaire distribution method to input applications. Of the graduates in 2017 there are 4521 alumni who have filled in the data well, and there is an increase in 2018 as many as 6487 which indicates that this application can be a means to meet alumni data needs.
PENENTUAN FAKTOR KALIBRASI ACCELEROMETER MMA7260Q PADA KETIGA SUMBU Wahyudi, Wahyudi; Susanto, Adhi; Hadi, Sasongko P; Widada, Wahyu
Transmisi Vol 11, No 1 (2009): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (347.936 KB) | DOI: 10.12777/transmisi.11.1.16-22

Abstract

The features of MMA7260Q are low cost, low current consumption, low voltage operation, high sensitivity, a 1-pole low pass filter, and g-Select which allows for the selection among 4 sensitivities. The accelerometer is an acceleration sensor that output signal in voltage/g, where g is an earth gravity. The acceleration is the rate of change of the velocity of an object and the velocity is the rate of change of the position of the same object. The position is the integration of velocity and the velocity is the integration of acceleration. If the data of the acceleration of an object is known, the data of the position can obtain by applied a double integration. This paper presents the calibration factor of three axis of accelerometers. The value of three calibration factor are not same. In general, the experiment using A1 algorithm and M2 method give the smaller of error than the other. The calibrations factor are 2.1158 for x axis, 1.6873 for y axis, and 2.1539 for z axis. The error of the distance estimation is about 3% till 4 %, so the research must be developed using the digital filter. Keywords: MMA7260Q, calibration factor, three axis
IDENTIFIKASI PLANT SIMULATOR SECARA ONLINE MENGGUNAKAN METODE JARINGAN SARAF TIRUAN DENGAN STRUKTUR MODEL NARX (NONLINEAR AUTOREGRESSIVE EXOGENOUS) Istiqomah, Dini Yasa; Setiyono, Budi; Sumardi, Sumardi
Transmisi Vol 17, No 1 Januari (2015): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (772.05 KB) | DOI: 10.12777/transmisi.17.1.1-6

Abstract

Abstrak   Pada Analisa sebuah sistem, hal ini dapat dilakukan lebih mudah jika diketahui persamaan model matematikanya. Salah satu caramendapatkan persamaan matematika adalahmenggunakan identifikasi sistem.. Identifikasi sistem adalah usaha untuk mendapatkan sebuah informasi yang berupa  model matematika yang didapat dari hasil analisa data masukan dan keluaran dari sistem. Pada penelitian ini dilakukan identifikasi secara online atau secara langsung terhubung dengan plant yang bersifat black-box. Metode identifikasi yang digunakan adalah algoritma Neural Network dengan model NARX(Nonlinear Auto Regressive Exogenous). Nilai masukan dan keluaran pada plant simulator akan diidentifikasi menggunakan model NARX dengan pelatihannya menggunakan algoritma Levenberg Marquardt. Hasil yang diperoleh dari identifikasi ini adalah berupa jaringan model. Berdasarkan hasil identifikasi menggunakan struktur model NARX, simulator plant sudah bisa direpresentasikan dalam bentuk jaringan model. Jaringan model ini dapat dibuat dalam persamaan matematika. Salah satu hasil identifikasi yang terbaik ditunjukkan dengan nilai MSE validasi pada rangkaian op-amp orde 3 dengan interkoneksi umpan balik yaitu 0,075.   Kata kunci: Identifikasi, Sistem Black-box, Jaringa Saraf Tiruan     Abstract In system analysis, it becomes easier if the mathematical equation can be known. One way to get the equation is using system identification. System identification is the discipline to obtain system information in the form of mathematical equation, starting from experimental data, the input and the output value.  In this research, the identification was online or directly connected with the black-box system. Neural network methods were used to identify the system. The input and output value of simulator plant were identified with NARX (Nonlinear Auto Regressive Exogenous) model and the training algorithm used Levenberg-Marquardt algorithm. The result from this identification was a model network. Based on the results, the simulator plant can be represented by the network models. The networks model show by mathematic equation form. The best identification gave by op-amp circuit order 3 with feedback interconnection. The MSE validation value of this network model was 0,075. Keywords: Identification, Black-box System, Neural Network

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