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All Journal Jurnal SPEKTRUM Jupiter IPTEK Journal of Proceedings Series TELKOMNIKA (Telecommunication Computing Electronics and Control) Matrix : Jurnal Manajemen Teknologi dan Informatika International Journal of Engineering and Emerging Technology Jurnal Locus Penelitian dan Pengabdian Jurnal SPEKTRUM
Nyoman Pramaita
Universitas Udayana
Aerospace Engineering Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Library & Information Science Mathematics Mechanical Engineering

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RANCANG BANGUN ANTENA Yagi-LPDA PADA FREKUENSI 162 MHz UNTUK AIS PADA KAPAL LAUT DI PERAIRAN PULAU BALI Putu Okta Hadi Saputra; I Putu Ardana; Nyoman Pramaita
Jurnal SPEKTRUM Vol 10 No 1 (2023): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2023.v10.i01.p7

Abstract

The role of the sea is very important as unifying the nation and the territory of Indonesia and consequently the Government is obliged to administer governance in the field of law enforcement both against threats of violations against the use of waters and to maintain and create shipping safety and security. One way to increase the ability of the apparatus and the government to monitor and secure the territory of the Unitary State of the Republic of Indonesia is to use the AIS (Automatic Identification System) system. This AIS is used to monitor the movement of ships and provide or receive information so that actions that can harm the Unitary State of the Republic of Indonesia can be prevented. Currently, ships in Indonesia are equipped with radar, but the scope of the radar emitted by Indonesian ships is still small and small. To overcome these problems the author wants to develop a thesis with the title "YAGI-LPDA Antenna Design at 162 MHz Frequency for Automatic Identification System (AIS) on Ships in Bali Island Waters" This antenna works by being connected to the AIS system at 162 MHz frequency which able to reach the presence of ships in the waters of the Bali Strait, Lombok Strait and its surroundings. The Yagi-LPDA antenna design prototype works in accordance with the antenna design in the MMANA-GAL software, namely in the form of an SWR with a value of 1.73, a gain of 8.12 dBi, and a radiation pattern that is unidirectional and during the ship monitoring process, the Yagi-LPDA antenna can be work well seen from the direction of the Yagi-LPDA antenna beam which is in the same direction and focused so as to be able to monitor the presence of ships in Benoa waters, the Lombok Strait and Nusa Penida.
ANALISIS KINERJA KODE BCH DAN WALSH DALAM SISTEM DIRECT SEQUENCE SPREAD SPECTRUM PADA KANAL FREQUENCY SELECTIVE FADING Joa Quin; Nyoman Pramaita; I Gst A. Komang Diafari Djuni H
Jurnal SPEKTRUM Vol. 12 No. 3 (2025): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/SPEKTRUM.2025.v12.i03.p6

Abstract

This research aims to analyze the performance of Bose–Chaudhuri–Hocquenghem (BCH) (7,4) coding in a Direct Sequence Spread Spectrum (DSSS) system using Walsh spreading codes under selective fading and Additive White Gaussian Noise (AWGN) channels. The simulation was conducted using MATLAB Simulink by varying the energy-per-bit to noise power spectral density ratio (Eb/No) to evaluate system performance based on the Bit Error Rate (BER). The results show that applying BCH(7,4) significantly reduces the BER, especially at moderate to high Eb/No levels. Furthermore, the combination of Walsh codes with BCH(7,4) demonstrates superior performance compared to systems without error correction. This study highlights the importance of proper selection of spreading and error correction methods in optimizing digital communication performance over multipath fading channels.
ANALISIS KINERJA KODE BOSE CHAUDHURI HOCQUENGHEM PADA DIRECT SEQUENCE SPREAD SPECTRUM PADA KANAL FREKUENSI SELECTIVE FADING Wahyu Sahputra; Nyoman Pramaita; Nyoman Gunantara
Jurnal SPEKTRUM Vol. 12 No. 4 (2025): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study aims to analyze the performance of Bose Chaudhuri–Hocquenghem (BCH) coding (7,4) in a Direct Sequence Spread Spectrum (DSSS) system using Pseudo Noise (PN) spreading code, under frequency selective fading and white Gaussian noise (AWGN) channel conditions. Simulations were performed using MATLAB Simulink to compare the system performance against Bit Error Rate (BER) at various values of bit energy to noise power density (Eb/No). The simulation results show that the use of BCH generally improves system performance by significantly reducing the BER value. At high Eb/No, the performance of PN + BCH is slightly better. This indicates that the effectiveness of signal coding and spreading is strongly influenced by channel conditions and noise levels. Code length, spreading type, and error correction method play an important role in optimizing digital communication performance.
Design Teknis Pemanfaatan Pita Frekuensi Radio 2600 MHz untuk Implementasi 5G di Bali Berbasis Data Okupansi dan Simulasi Seamcat I Nyoman Suada; I Made Oka Widyantara; Nyoman Pramaita
Jurnal Locus Penelitian dan Pengabdian Vol. 5 No. 5 (2026): JURNAL LOCUS: Penelitian dan Pengabdian
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/locus.v5i5.5824

Abstract

Implementasi 5G di Bali menghadapi keterbatasan spektrum, sementara pita 2600 MHz belum dirilis karena kekhawatiran interferensi dengan layanan Fixed Satellite Service (FSS) dan belum adanya kajian teknis berbasis data riil. Penelitian ini bertujuan merumuskan desain teknis pemanfaatan pita 2600 MHz untuk mendukung kebutuhan data tinggi di kawasan pariwisata Bali serta mewujudkan visi smart island. Metode penelitian meliputi observasi monitoring spektrum langsung di lapangan menggunakan standar ITU-R SM.1880-2 untuk menganalisis okupansi riil, kemudian simulasi koeksistensi antara sistem 5G NR dan FSS menggunakan perangkat lunak SEAMCAT dengan metode Monte Carlo untuk memprediksi probabilitas interferensi dan menentukan parameter mitigasi. Hasil penelitian menunjukkan pita 2600 MHz di Bali teridentifikasi belum terduduki (clear). Pada skenario co-channel, diperlukan jarak proteksi 18 km untuk mencapai probabilitas interferensi (PI) 0%, sehingga secara teknis tidak layak. Sebaliknya, pada skenario kanal bersebelahan dengan guard band 20 MHz, koeksistensi layak dilakukan tanpa interferensi (PI=0%) pada jarak proteksi minimum 32 meter. Kebaruan penelitian ini terletak pada integrasi data okupansi riil dari stasiun monitor Bali dengan simulasi SEAMCAT yang kontekstual untuk pita 2600 MHz, menghasilkan parameter jarak proteksi spesifik dan skema alokasi blok untuk tiga operator. Luaran penelitian ini berupa desain alokasi yang direkomendasikan menggunakan mode TDD pada band n41 untuk pemanfaatan bandwidth optimal 190 MHz, atau mode FDD pada band n7 dengan guard band untuk menjamin koeksistensi dengan layanan satelit, yang siap menjadi acuan teknis bagi regulator dan operator.
Co-Authors Agus Dharma Arzalia Khairunnisa Yasmine Charolina Devi Oktaviana Soleman Charolina Devi Oktaviana Soleman D. C. Khrisne DNKP Negara Hardi yusa I G A Ari Kukuh Sentanu I G. A. K. Diafari Djuni Hartawan I G.A.G.K. Diafari I Gd. Tri Dharma Prawira I Gede Abi Yodita Utama I Gede Arya Gangga Gajanada I Gede Harsemadi I Gede Krisnu Wardana I Gst Agung Putu Raka Agung I Gusti Agung Komang Diafari Djuni Hartawan I Kadek Adi Wiguna Sanjaya I Ketut Widi Arjana Yasa I Komang Dharmendra I M. A. Suyadnya I Made Agung Pranata I Made Oka Widyantara I Nyoman Gunantara I Nyoman Suada I Putu Agus Priska Suryana I Putu Ardana I Putu Dio Gangga Saskara I Putu Indra Pramana Yoga I Putu Warma Putra Ida Bagus Kade Dwi Suta Negara Janice Jessica Indrayani Joa Quin Kadek Agus Mahabojana Dwi Prayoga Komang Diyana Putra Komang Gede Widi Adnyana Komang Oka Saputra Linawati Linawati Luh Kadek Pracanthi Dyah Sekartaji M. Husnul Ullum Azhari Made Arya Putra Kusuma Made Sudarma Made Sugiri Muhamad Zainul Halim Ni Made Ary Esta Dewi Wirastuti Ni Putu Lintang Anggitiadewi NMAE Dewi Wirastuti Nyoman Putra Sastra P. L. Johnson Pande Ketut Sudiarta Pebri Yeni Samosir Putra Yudhanata Pratama Putu Okta Hadi Saputra Sagung Intan Saraswati Tria Hikmah Fratiwi Wahyu Sahputra Willy Sucipto