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All Journal Seminar Nasional Aplikasi Teknologi Informasi (SNATI) TELKOMNIKA (Telecommunication Computing Electronics and Control) Journal of ICT Research and Applications Seminar Nasional Informatika (SEMNASIF) ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika EMITTER International Journal of Engineering Technology JETT (Jurnal Elektro dan Telekomunikasi Terapan) JOIV : International Journal on Informatics Visualization JURNAL TIARSIE TEKTRIKA - Jurnal Penelitian dan Pengembangan Telekomunikasi, Kendali, Komputer, Elektrik, dan Elektronika JMECS (Journal of Measurements, Electronics, Communications, and Systems) Aviation Electronics, Information Technology, Telecommunications, Electricals, Controls (AVITEC) Madani : Indonesian Journal of Civil Society Jurnal Nasional Teknik Elektro dan Teknologi Informasi Industrial Research Workshop and National Seminar eProceedings of Engineering Jurnal INFOTEL
Arfianto Fahmi
Universitas Telkom
Aerospace Engineering Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Other

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Device Discovery Schemes for Energy-efficient Cluster Head Rotation in D2D Bhaskara Narottama; Arfianto Fahmi; Budi Syihabuddin; Desti Madya Saputri; Patricius Evander Christy; Obed Rhesa Ludwiniananda
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 15, No 1: March 2017
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v15i1.4676

Abstract

 In this paper, novel device discovery approaches for the Cluster Head Rotation, which is a state-of-the-art method for the Device-to-Device communication, are proposed. The device discovery is the process to detect and to include new devices in the Device-to-Device communication. The proposed device discovery is aimed to attain energy efficiency for the communication devices. We propose two schemes for the device discovery: eNB-assisted and independent device discovery. Compared to previous work, the proposed device discovery is utilizing the cluster head rotation method, to achieve better energy efficiency. In this work, several simulations were performed and discussed for both schemes. In the first simulation, the device energy consumption is examined. After that, the number of devices that get rejected is studied. The device discovery processes in multi cluster head scenario, which is Cluster Head Rotation, are examined in this paper. The result of the simulation shows that eNB-assisted device discovery can provide better energy efficiency. Also, the number of rejected devices of the eNB-assisted device discovery is slightly lower than independent device discovery.
A Combined User-order and Chunk-order Algorithm to Minimize The Average BER for Chunk Allocation in SC-FDMA Systems Arfianto Fahmi; Rina Pudji Astuti; Linda Meylani; Muhamad Asvial; Dadang Gunawan
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 14, No 2: June 2016
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v14i2.3299

Abstract

A Chunk by chunk-based allocation is an emerging subcarrier allocation in Single Carrier Frequency Division Multiple Access (SC-FDMA) due to its low complexity. In this paper, a combined user-order  and chunk-order allocation for solving chunk allocation problem which minimizes the average BER of all users while improving the throughput in SC-FDMA uplink is proposed. The subcarrier grouping into a chunk of all users on both-order allocations are performed by averaging the BER of a contiguous subcarriers within a chunk. The sequence of allocation is according to the average of users’ BER on user-order allocation and the average of chunks’ BER on chunk-order allocation. The best allocation is determined by choosing one of both-order allocations which provides the smaller BER systems. The simulation results showed that the proposed algorithm can outperform the previous algorithms in term of  average BER and throughput without increase the time complexity.  
Energy efficient resources allocations for wireless communication systems Vinsensius Sigit Widhi Prabowo; Arfianto Fahmi; Nachwan Mufti Adriansyah; Nur Andini
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 17, No 4: August 2019
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v17i4.10135

Abstract

The energy consumption level of the telecommunication process has become a new consideration in resource management scheme. It is becoming a new parameter in the resource management scheme besides throughput, spectral efficiency, and fairness. This work proposes a power control scheme and user grouping method to keep the rational energy consumption level of the resource management scheme. Inverse water-filling power allocation is a power allocation scheme that optimizes the energy efficiency by giving the power to the user which have good channel conditions. The user grouping method becomes the solution for carrier aggregation (CA) scheme that prevents edge cell user get the resources from the high-frequency carrier. This can prevent energy wastage in the transmission process. This power control scheme and user grouping method can optimize the spectral and energy efficiency without increasing the time complexity of the system.
Selective Green Device Discovery for Device-to-Device Communication Bhaskara Narottama; Arfianto Fahmi; Rina Pudji Astuti; Desti Madya Saputri; Nur Andini; Hurianti Vidyaningtyas; Patricius Evander Christy; Obed Rhesa Ludwiniananda; Furry Rachmawati
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 15, No 4: December 2017
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v15i4.6686

Abstract

The D2D communication is expected to improve devices’ energy-efficiency, which has become a major requirement of the future wireless network. Before the D2D communication can be performed, the device discovery between devices must be done. The previous works usually only assumed one mode of device discovery, i.e. either use network-assisted (with network supervision) or independent (without network supervision) device. Therefore, we propose a selective device discovery for device-to-device (D2D) communication that can utilize both device discovery modes and maintain devices’ energy-efficiency. Different from previous works, our proposed method selects the best device discovery mode to get the best energy-efficiency. Moreover, to further improve the energy-efficiency, our proposed method also deployed in D2D cluster with multiple cluster heads. The proposed method selects the most suitable mode using thresholds (cluster energy consumption and new device acceptance) and cluster energy expectation. Our experiment result indicates that the proposed method provides lowest energy consumption per new accepted device while compared with schemes with full network-assisted and independent device discovery in low numbers of new device arrival (for the number of new devices arrival = 1 ~ 3).
Perencanaan Penempatan Base Station WCDMA di Denpasar I Putu.D Irawan; Arfianto Fahmi; Kris Sujatmoko
Seminar Nasional Aplikasi Teknologi Informasi (SNATI) 2009
Publisher : Jurusan Teknik Informatika, Fakultas Teknologi Industri, Universitas Islam Indonesia

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Abstract

Kongesti merupakan fenomena penurunan perfomansi jaringan akibat dari permintaan bandwith user melebihikapasitas yang disediakan oleh jaringan. Transmission Control Protocol (TCP) adalah sebuah transportprotocol yang dapat mendeteksi pembuangan paket dan menginterpretasikan pada sumber sebagai indikasiterjadi kongesti pada jaringan. Active Queue Management (AQM) merupakan suatu mekanisme proaktif darirouter untuk memberikan indikasi terjadinya kongesti pada jaringan. Makalah ini membahas tentangpenghindaran kongesti dengan menggunakan mekanisme AQM, yaitu Random Early Detection (RED)termodifikasi. Langkah pertama yang dilakukan adalah membangun model matematika dari prilaku aliran TCP.Selanjutnya, menganalisis model sehingga masalah AQM dapat dipandang sebagai masalah kontrol umpanbalik. Akhirnya, dengan menggunakan aproksimasi Padé untuk masalah delay, masalah kontrol umpan balikdisimulasikan menggunakan network simulator (ns) dan dianalisis performansi RED termodifikasiberdasarkanparameter Quality of Service (QoS) , antara lain : throughput, panjang antrian, utilization link, index fairness,dan delay serta stabilitas sistem.Kata Kunci: Quality of Service (QoS), TCP, AQM, RED termodifikasi
Studi Penerapan Sistem Adaptif Othogonal Frequency Division Multiplexing untuk Aplikasi Multiuser Bobby Juan Pradana; Arfianto Fahmi; Dharu Arseno
Seminar Nasional Aplikasi Teknologi Informasi (SNATI) 2006
Publisher : Jurusan Teknik Informatika, Fakultas Teknologi Industri, Universitas Islam Indonesia

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Abstract

Teknik Othogonal Frequency Division Multiplexing (OFDM) merupakan teknik modulasi multicarrier, yang mengizinkan spektrum antar subcarrier saling overlap sehingga memiliki efisiensi bandwidth yang tinggi. OFDM memecah data kecepatan tinggi menjadi data kecepatan rendah.OFDM dengan modulasi adaptif dapat digunakan untuk sistem komunikasi dari base station ke user (downlink) dengan menggunakan bandwidth yang tersedia untuk dibagi-bagi menjadi independent subchannel. Dalam skenario multiple access nantinya tiap user memiliki bit rate yang berbeda-beda.Sehingga dengan menggunakan Algoritma Alokasi Subcarrier Adaptif untuk Sistem Multiuser OFDM maka hasil yang didapat pada simulasi menunjukkan bahwa kinerja sistem multiuser akan sama dengan single user pada kanal AWGN dan saat keadaan diam. Untuk kanal multipath fading, kinerja multiuser hanya berbeda 1 – 2 dB dibandingkan single user untuk masukan empat user. Sistem multiuser dengan skema Variable Bit Rate (VBR) sesuai untuk aplikasi dengan target bit rate di bawah 20 Mbps, sedangkan skema Constant Bit Rate (CBR) sesuai untuk aplikasi dengan target bit rate di atas 20 Mbps.Skema CBR digunakan untuk pencapaian bit rate requirement dalam suatu aplikasi dan dapat menggambarkan multiple access arah downlink untuk user pada jarak dan posisi yang berbeda-beda.Kata kunci: OFDM, multiple access, alokasi subcarrier, VBR, dan CBR.1. PENDAHULUANTeknik modulasi multicarrier Othogonal Frequency Division Multiplexing (OFDM) merupakan teknik modulasi multicarrier, yang mengizinkan spektrum antar subcarrier saling overlap sehingga memiliki efisiensi spektrum yang tinggi. OFDM memecah data kecepatan tinggi menjadi data yang kecepatan rendah, sehingga efek frequency selective yang dialami sinyal OFDM akan menjadi flat fading pada tiap-tiap subcarrier. Teknik estimasi kanal akan memberikan peningkatan kinerja sistem OFDM, sehingga efek kanal yang menyebabkan fading dapat dikurangi.Untuk estimasi kanalnya menggunakan channel estimator satu dimensi. Mengasumsikan kondisi kanal adalah multipath fading yang terdistribusi Rayleigh dengan noise yang bersifat Additive White Gaussian Noise (AWGN). Sehingga dengan mengetahui kondisi SNR kanal, maka dapat dilakukan pengalokasian subcarrier untuk memodulasi data dalam sistem OFDM ini.Untuk mengoptimalkan kinerja sistem OFDM, pada penelitian ini akan diteliti penerapan modulasi adaptif pada sistem OFDM. Modulasi adaptif tergantung pada kanal, dimana karakteristik kanal menentukan besarnya SNR di penerima. Informasi mengenai SNR digunakan untuk memilih mode modem. Analisis dilakukan terhadap unjuk kerja OFDM dengan modulasi adaptif berupa pengukuran Bit Error Rate (BER) dan dibandingan dengan sistem OFDM modulasi tunggal. Algoritma yang digunakan untuk proses adaptasi mode modem berupa algoritma alokasi subcarrier atau algoritma adaptive bit- loading pada sistem OFDM.Sistem OFDM ini dicoba diterapkan sebagai teknik multiple access. Sistem yang diteliti pada penelitian ini tidak menggunakan OFDMA (Orthogonal Frequency Division Multiple Access) secara murni, tetapi penggabungan antara sistem OFDM dengan TDMA.Tujuan Penelitian ini adalah untuk melihat kinerja penerapan sistem modulasi adaptive pada sistem multiuser OFDM dimana kinerja dilihat pada kanal multipath fading yang terdistribusi secara rayleigh. Sedangkan metoda yang digunakan adalah simulasi menggunakan perangkat lunak Matlab 7. Kelebihan metoda penelitian menggunakan simulasi adalah pendekatan yang dilakukan bisa dilakukan secara ideal menurut teoritis dan kelemahan dari metoda ini adalah lamanya waktu simulasi bergantung pada spesisfikasi komputer yang digunakan.2. SISTEM MULTIUSER OFDM2.1 Dasar OFDMSinyal OFDM merupakan penjumlahan beberapa subcarrier yang dimodulasi menggunakan Phase Shift Keying (PSK) atau Quadrature Amplitude Modulaton (QAM) dimana untuk modulasi baseband menggunakan blok IFFT. Sinyal lowpass OFDM dapat dituliskan persamaannya dengan beberapa carrier termodulasi secara paralel. Persamaannya dapat dinyatakan sebagai berikut:H-1
Simulasi Sistem DS-CDMA dengan Berbagai Kode Penebar Basuki Rachmat; Ali Muayadi; Arfianto Fahmi
Seminar Nasional Aplikasi Teknologi Informasi (SNATI) 2007
Publisher : Jurusan Teknik Informatika, Fakultas Teknologi Industri, Universitas Islam Indonesia

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Abstract

Pada sistem DS-CDMA, sejumlah user menggunakan lebar pita frekuensi yang sama dan dalam waktuyang bersamaan. Tiap user dibedakan oleh kode unik (kode penebar). Tetapi yang sering terjadi adalah adanyakorelasi antar kode penebar yang digunakan, sehingga setiap user akan mengalami interferensi antar user. Halini sangat dipengaruhi oleh tingkat orthogonalitas dari kode penebar yang digunakan.Pada makalah ini akan dilakukan studi komparasi kinerja sistem dengan menggunakan beberapa kodepenebar yang berbeda-beda. Kode yang digunakan adalah PN-sequence, Walsh code, Zadoff-Chu code danGolay Code. Lalu akan dibandingkan kinerja sistem ketika ada variabel yang berubah. Seperti bagaimanaperbaikan kinerja sistem (BER) ketika jenis kode dan panjang kode berubah.Dari simulasi kinerja sistem pada kondisi kanal AWGN dan Rayleigh, taget BER layanan voice yaitu 10-3dicapai pada rentang nilai SNR 5–10 dB untuk kode Walsh dan Golay, sedangkan untuk kode PN dan Zadofftidak bisa mencapai target BER. Pada kondisi terburuk ketika kanal pada kondisi frekuensi selektif, kode Golaymasih lebih baik dibandingkan dengan yang lain. Untuk kapasitas sistem sangat dipengaruhi oleh panjang kodepenebar yang digunakan. Ketika jumlah user yang aktif mendekati panjang kode penebar yang digunakan makakinerja sistem akan mengalami titik jenuh.Kata kunci: DS-CDMA, Kode Spreading, Auto korelasi, Korelasi Silang
SIMULASI SISTEM DS-CDMA DENGAN BERBAGAI KODE PENEBAR Basuki Rachmat; Ali Muayadi; Arfianto Fahmi
Seminar Nasional Informatika (SEMNASIF) Vol 1, No 2 (2008): Instrumentational And Robotic
Publisher : Jurusan Teknik Informatika

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Abstract

In DS-CDMA, a number of users are able to use the same frequency bandwidth in the same time. Each user’s canal is differentiated by a unique code (spread code) used to spread the power of information signal into bandwidth wider the information signal bandwidth. But, the thing commonly happen is that there is correlation between spreader codes used, so users will interference each other. This is very much obtained by the orthogonal levels of spreader code used.In this final paper, a study on comparison of the system performance will be done by using different spreader code. Codes that are used in this study are PN-sequence, Walsh code, Zadoff-Chu code and Golay code. And then, the system performance will also compared when some variables are changed, e.g. on how the system performance correction (BER) when variety and length of code are changed.From the simulation of system performance in the canal condition of AWGN and Rayleigh, the target of BER in voice service of 10-3 is reached in the SNR range of 5-10 dB for Walsh and Golay; PN and Zadoff can not reach BER target. In the worst condition when the canal is in selective condition, Golay code still better than the other codes. System capacity is so much determined by length of spreader code. When the amount of active user approaches length of used spreader code, the system performance will be in saturation point.
Perfomance Comparison of Genetic and Greedy Algorithms in Underlay Device-to-Device Communication Salma Pratiwi; Arfianto Fahmi; Vinsensius Sigit Widhi Prabowo
EMITTER International Journal of Engineering Technology Vol 8 No 2 (2020)
Publisher : Politeknik Elektronika Negeri Surabaya (PENS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24003/emitter.v8i2.566

Abstract

The number of cellular users (CU) continues to increase in Indonesia. This impacts a large network load for the number of devices connected to the main network so it will have an impact on the quality of service. Device-to-Device (D2D) communication as components for LTE-A technology enabling a direct wireless link between the CUs without routing the data via the evolved Node B (eNB) signal or the core network. The need for algorithm and power control used to allocate radio resources so it can get a good quality of service because of communications technology D2D. In this study, we analyze and compare the performance parameters of D2D communication systems, including system interference, system sum-rate, system spectral efficiency, total energy system, and system energy efficiency based on Genetic and Greedy Algorithms in allocating radio resources and controlling the power of users. The genetic algorithm works with three operators in allocating resource block (RB), including proportional selection, crossover, and mutation. This process is repeated many times to produce several generations so that the best allocation can be got. The genetic algorithm has a flexible number of D2D and cellular communications in several RBs, minimum signal to interference plus noise ratio (SINR) also considered for mobile communication in ensuring the quality of its services. Numerical evaluations demonstrate the superior performance of the Genetic Algorithm in terms of system power, energy efficiency, and interference mitigation. As repetition gets larger, the Genetic algorithm results in better spectral efficiency.
Improved Performance of Mean Greedy Algorithm for Chunk Allocation in SC-FDMA Uplink Systems using Joint-User and Chunk-Based Allocation Arfianto Fahmi; Muhamad Asvial; Dadang Gunawan
Journal of ICT Research and Applications Vol. 7 No. 1 (2013)
Publisher : LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.ict.res.appl.2013.7.1.4

Abstract

In this paper, the problem of subcarrier allocation on chunk-by-chunk basis in SC-FDMA uplink systems is investigated. Improved mean enhanced greedy algorithms are proposed for performing joint-user and chunk-based allocation at each transmission time interval. Selection criteria based on spectral efficiency and fairness are also proposed to choose the final allocation at each transmission time interval. Simulation results show that when the number of users and the velocity of the users were varied, the improved algorithms that use selection criteria based on spectral efficiency and fairness could outperform the existing mean greedy algorithms that employ user-based allocation in terms of spectral efficiency and fairness. Moreover, the improved algorithms not only showed better performance but also had the same time complexity as the existing mean greedy algorithms.
Co-Authors A.A. Ketut Agung Cahyawan W A.B. Muhammad Abi Hakim Amanullah Achmad Ali Muayyadi Afandi, Mas Aly Afief Dias Pambudi Agus Cahya Ananda Yoga Putra Ahmad Sulaeman Ahmad Tri Hanuranto Aji Maulana Akhmad Hambali Ali Muayadi Ali Muayadi Ali Muayyadi Ali, Erfansyah Alit Dian Saepudin anah Putri Andre Yohanes Antoni Andreana Yunio Prasetya Andri Juli Setiawan Anggun Fitrian Isnawati Anhar Muthaqien Aprian Firlanda Imani Aries Priyadi Ramadhan Bhaskara Narottama Bhaskara Narottama Bobby Juan Pradana Boy Fernando Brian Pamukti Budi Syihabuddin Claudia Sofiana Tamba Dadan Nur Ramadan Dadang Gunawan Dadang Gunawan Denny Darlis Desti Madya Saputri Devin Benz Rizki Dharu Arseno Diah Ayu Lestari, Diah Ayu Doan Perdana Dody Herdianto Rachmat Edwar Elmira Puspa Sari Ema Rachmawati Erwin Priyantono Ezi Rohmat Fairuz Azmi Faishal Daffa Fajar Adityawarman Fajar Adityawarman Ferdi Setyo Ariawan Firli Fauzia Karima Furry Rachmawati Gasi Dhias Gina Ilma Amalia Gina Ramadhanti Hafidh Finandriyanto Hamka Ikhlasul Amal NZ Heroe Wijanto Hurianti Vidyaningtyas I Gede Aditya Pratama I Putu.D Irawan Ilham putra pratama Indra Lukmana Sardi Indrarini Dyah Irawati Jefry Armando Yunas Josia Ezra Kris Sujatmoko Krisna Rangga Pradhana Kurnia Cahya Ade Putra Linda Meylani Luh Putu Ayu Sri Aryaningrum Luthfi Aditama Luthfi Nur'Adli Mega Nugraha Meutia Qoonita Noviyani Mochammad Arfin Mohamad Yasin Ramadhan Muhamad Asvial Muhamad Fithryan Muhammad Irfan Maulana Muhammad Raudhi Azmi Muhammad Salman Al Faris Muhammad Yaser Nachwan Mufti Adriansyah Nur Andini Nur Fathimah Nur Indah Nuriadnyana, Rana Nyoman Bogi Aditya Karna Obed Rhesa Ludwiniananda Obed Rhesa Ludwiniananda Patricius Evander Christy Patricius Evander Christy Pradika Erta Ardanta Priatama Yadita Purusadi Hastruman Raden Arjani Rosalina Rana Nuriadnyana Rana Nuriadnyana Ray Putra Tarigan Raynanda Chandra Wibisono Rendy Munadi Reni Dyah Wahyuningrum Revi Dianawati Reyza Pratama Rifki Fauzi Nurzaman Rina Pudji Astuti Rizal Haerul Akbar Rizky Wahyudi Robie Zulfalaily AK Rudi Sianipar Saleh Dwi Mardiyanto Salma Pratiwi Simon Siregar Sitha Vrindhavani Devi Putri Suci Monica Sari Sugondo Hadiyoso Suryananda Padmadinata Syaiful Rahmat Tjahjo Adiprabowo R Uke Kurniawan Usman Vinsensius Sigit Vinsensius Sigit Vinsensius Sigit Widhi Prabowo Wildan Maulani Wulan Dwi Anggraini Yayan Agustian Yoga Prahara Novandanu Yosia Raya Peranginangin Yudha Purwanto Yudhi Suryanto Yuyu Wahyu