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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 Journal of Electrical, Electronics and Informatics International Journal of Engineering and Emerging Technology Jurnal SPEKTRUM

Nyoman Pramaita

Universitas Udayana

Author-ID : 2455288

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 Mechanical Engineering

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Desain Program Simulasi Unjuk Kerja Kode Pn Pada Kanal Multipath Fading Putra Yudhanata Pratama; Nyoman Pramaita; Ni Made Ary Esta Dewi Wirastuti; I Gusti Agung Komang Diafari Djuni Harta
Matrix : Jurnal Manajemen Teknologi dan Informatika Vol 10 No 1 (2020): MATRIX - Jurnal Manajemen Teknologi dan Informatika
Publisher : Unit Publikasi Ilmiah, P3M Politeknik Negeri Bali

Halangan pada Line of Sight (LOS) dapat menyebabkan difraksi (pembelokan), refleksi (pemantulan), dan scattering (penghamburan) pada sinyal informasi dimana akan mengurangi kualitas sinyal informasi yang diterima pada sisi penerima. Hal tersebut mengakibatkan adanya sifat konstruktif maupun destruktif pada sinyal di sisi penerima. Contoh sifat destruktif yang sering terjadi yakni fading dan delay. Sistem penerima correlation receiver diimplementasikan guna mengatasi masalah yang timbul akibat efek dari multipath fading. Untuk memperoleh sinyal dengan nilai error minimum, maka diperlukan analisis terkait proses transmisi pada masing-masing komponen multipath. Hasil analisis diperoleh bahwa unjuk kerja dari Kode PN (Pseudo Noise) pada kanal frequency selective fading yang lebih baik adalah variasi komponen multipath = 3 dibandingkan dengan variasi komponen multipath = 6 dan yang paling buruk adalah variasi komponen multipath = 7. Hal ini dibuktikan dengan melihat nilai Bit Error Rate (BER) saat Energy Per Bit To Noise Power Spectral Density Ratio (Eb/No) = 10 dengan komponen multipath = 3 memiliki nilai BER 0,00368, sedangkan komponen multipath = 6 dan komponen multipath = 7 memiliki nilai BER berturut – turut adalah 0,00386 dan 0,00507. Berdasarkan hasil analisis tersebut dapat diambil simpulan bahwa jumlah komponen multipath yang ada berpengaruh terhadap kualitas sinyal yang diterima.

PENGHITUNG JUMLAH ORANG MASUK DAN KE LUAR BERBASIS IoT DILENGKAPI PENGUKUR SUHU TUBUH I Putu Indra Pramana Yoga; I Gusti Agung Komang Diafari Djuni H; Nyoman Pramaita
Jurnal SPEKTRUM Vol 9 No 1 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

As a precaution against the spread of the Covid-19 virus in public facilities, thegovernment requires to measure temperature and limit the number of people in order to preventnew clusters, especially in crowded centers. To reduce this problem, a prototype of the numberof people entering and leaving through the IoT-based door will be made using an ultrasonicsensor HCSR-04 equipped with a body temperature meter. This system works from reading thetemperature sensor value MLX90614, when the temperature is above 37oC then the doorremains closed and when the temperature is below 37oC the door will open, ultrasonic sensor 1is placed on the entrance side and ultrasonic sensor 2 is placed on the exit side, if the sensor 1receives one input, the system will automatically add a variable number of visitors, if sensor 2receives one input, the system will automatically reduce the variable number of visitors, andwhen the room is full of 10 people, the servo motor will close the door automatically, informationon body temperature and total person data will be displayed on the LCD and the Blynkapplication and sent to the MySql webserver database in real time. The prototype system thathas been made is capable of detecting body temperature and counting the number of peopleentering and leaving the door according to the design.

UNJUK KERJA KODE ORTHOGONAL M-SEQUENCE DALAM SISTEM DIRECT SEQUENCE SPREAD SPECTRUM MELALUI KANAL MULTIPATH FA Komang Gede Widi Adnyana; Nyoman Pramaita; I Made Oka Widyantara
Jurnal SPEKTRUM Vol 9 No 4 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Multipath and multi-user interference are the main challenges in wireless communication systems. This has become a driving force for the development of data transmission technology that is focused to overcome these problems, one of which is spread spectrum. Spread spectrum is applied to CDMA technology which has the limitations of MAI, so a spreading code is required with specifications that have a very low cross-correlation value as in the orthogonal m-sequence code. In this study, simulate the orthogonal m-sequence code with a length of 8 chips on a multipath fading channel using the Direct Sequence Spread Spectrum system with aims of assessing the performance of the orthogonal m-sequence code on a multipath fading channel, based on the effect of changes in the number of multipath components. The research method used is a Monte Carlo simulation on simulink with the output data in the form of a graph of the comparison value of BER with Eb/No. The results show that on the flat fading channel with the number of components multipath 1, the BER value of the simulation results is in accordance with the BER theory so that the simulation is valid and can be applied to frequency selective fading channels. In the frequency selective fading channel with the number of multipath components 4,6, and 8, the best performance was shown in the multipath 4 component with the smallest BER value, this was influenced by the ACF and CCF values so that the multipath 4 component had the lowest ISI and interference between users.

DESAIN SIMULASI PERFORMANSI KODE ORTHOGONAL GOLD PADA KANAL MULTIPATH FADING Arzalia Khairunnisa Yasmine; Nyoman Pramaita; N.M.A.E.D Wirastuti
Jurnal SPEKTRUM Vol 9 No 4 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

Improved wireless communication system generate the various advanced technologies, one of which is spread spectrum technique. This technique working by multiplying dots bits information which have a large period with spreading code that have a smaller periode, which makes bit periode will follow the code periode. In order to maximize performance of this technique, an efficient code is required to reduce the occurrence of interference. The purpose of this study was to see how the variation of multipath components affected the work of the orthogonal gold code. This study compares BER vs. Eb/No for multipath components 10, 15, and 20 using code length 32, 8 users, and BPSK modulation. The multipath component 10 exhibits the best BER value, which is impacted by the degree of interference indicated by the size of the ACF value. and CCF on a non-zero shift.

DESAIN SIMULASI UNJUK KERJA BARKER CODE PADA KANAL FREQUENCY SELECTIVE FADING I Putu Dio Gangga Saskara; Nyoman Pramaita; I Gusti Agung Komang Diafari Djuni H
Jurnal SPEKTRUM Vol 9 No 3 (2022): Jurnal SPEKTRUM
Publisher : Program Studi Teknik Elektro UNUD

The signal that arrives at the receiving end is the sum of the various transmissions passed by the signal (multipath) which is influenced by the channel so that there is signal interference. Many innovations have been made so that the received signal can have high security, one of which is spread spectrum with a dual access scheme to increase the ability of many spectrum users in a limited number without disturbing one another. This simulation was tested with the aim of spreading the spectrum with different code lengths for the same bit length of information, and observed from the change in the BER value obtained from the MATLAB 2018a simulation results to find out how the barker code performance on the frequency selective fading channel on a single user. The analysis of this research is obtained from the simulation results in the form of a graph that shows the BER value compared to Eb/No. The BER value shown by the barker code performance on the flat fading channel, which is compared based on the existing flat theory, shows the graph trend and the BER value generated from the simulation is close to the theoretical flat BER value. The performance of the barker code on the frequency selective fading channel is carried out by varying the number of multipath components 7, 5, and 3. The simulation results show that multipath 3 is the best with the smallest bit error value compared to multipath 7 and 5. Barker code performance is strongly influenced by the number of multipath components, the more the number of multipath components, the more performance of the barker code bit error, and vice versa.

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

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

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

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.

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 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

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