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All Journal Transmisi: Jurnal Ilmiah Teknik Elektro Mechatronics, Electrical Power, and Vehicular Technology e-Jurnal Arus Elektro Indonesia EMITTER International Journal of Engineering Technology Briliant: Jurnal Riset dan Konseptual JOIV : International Journal on Informatics Visualization Jurnal Inovasi Hasil Pengabdian Masyarakat (JIPEMAS) Publikasi Hasil Pengabdian Kepada Masyarakat. Jurnal ELTEK
I Gede Puja Astawa
Electronics Engineering Polytechnic Institute of Surabaya
Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Engineering Other

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An Implementation of Error Minimization Data Transmission in OFDM using Modified Convolutional Code Briantoro, Hendy; Astawa, I Gede Puja; Sudarsono, Amang
EMITTER International Journal of Engineering Technology Vol 3, No 2 (2015)
Publisher : Politeknik Elektronika Negeri Surabaya (PENS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (363.575 KB) | DOI: 10.24003/emitter.v3i2.44

Abstract

This paper presents about error minimization in OFDM system. In conventional system, usually using channel coding such as BCH Code or Convolutional Code. But, performance BCH Code or Convolutional Code is not good in implementation of OFDM System. Error bits of OFDM system without channel coding is 5.77%. Then, we used convolutional code with code rate 1/2, it can reduce error bitsonly up to 3.85%. So, we proposed OFDM system with Modified Convolutional Code. In this implementation, we used Software Define Radio (SDR), namely Universal Software Radio Peripheral (USRP) NI 2920 as the transmitter and receiver. The result of OFDM system using Modified Convolutional Code with code rate is able recover all character received so can decrease until 0% error bit. Increasing performance of Modified Convolutional Code is about 1 dB in BER of 10-4 from BCH Code and Convolutional Code. So, performance of Modified Convolutional better than BCH Code or Convolutional Code.Keywords: OFDM, BCH Code, Convolutional Code, Modified Convolutional Code, SDR, USRP
Performance Analysis of Circular 8-QAM Constellation with MMSE Equalizer for OFDM System Using USRP Taufiqurrahman, Muh. Alfan; Astawa, I Gede Puja; Sudarsono, Amang
EMITTER International Journal of Engineering Technology Vol 4, No 2 (2016)
Publisher : Politeknik Elektronika Negeri Surabaya (PENS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1974.161 KB) | DOI: 10.24003/emitter.v4i2.148

Abstract

Bandwidth is very important in communication system, and it is a limited resource. In order to save the limited bandwidth resource, high order M-ary modulation is widely employed in modern communication and broadcasting systems. In Orthogonal Frequency Division Multiplexing (OFDM), fading environment lead to a loss of orthogonality between the subcarriers. In this paper, we present the performance analysis of circular 8-Quadrature Ampilutude Modulation (QAM) constellation for Orthogonal Frequency Division Multiplexing (OFDM) system. We also combine the system with Minimum Mean Square Error (MMSE) equalizer to mitigate the effect of Inter Symbol Interference (ISI). Then, all of this system is implemented practically using Universal Software Radio Peripheral (USRP). The performance of circular 8-QAM and MMSE equalizer is evaluated by comparing with other 8-QAM modulation models such as circular-Zero Forcing (ZF), star-ZF, Square-ZF, Star-MMSE, and Square-MMSE. The performance of circular 8-QAM with MMSE equalizer is  better than the other combinations. Bit Error Rate (BER) graph shows that the performance of circular-MMSE is better than star-MMSE. The performance improvement using circular-MMSE is about 1.6%. The performance will decrease when the distance is increased. The performance of this system is greatly affected by the distance between transmitter and receiver.
Trusted Data Transmission Using Data Scrambling Security Method with Asymmetric Key Algorithm for Synchronization Saadah, Nihayatus; Astawa, I Gede Puja; Sudarsono, Amang
EMITTER International Journal of Engineering Technology Vol 6, No 2 (2018)
Publisher : Politeknik Elektronika Negeri Surabaya (PENS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (804.766 KB) | DOI: 10.24003/emitter.v6i2.267

Abstract

Security is a major concern of the internet world because the development of the Internet requires the security of data transmission. The security method helps us to store valuable information and send it over an insecure network so that it can not be read by anyone except the intended recipient. Security algorithm uses data randomization method. This method of data information randomization has a low computation time with a large number of bits when compared to other encryption algorithms. In general, the encryption algorithm is used to encrypt data information, but in this research the encryption algorithm is used for synchronization between the sender and the intended recipient. Number of bits on asymmetric key algorithm for synchronization are the 64-bits, 512-bits and 1024-bits. We will prove that security methods can secure data sent with low computational time with large number of bits. In the result will be shown the value of computing time with variable number of bits sent. When data are sent by 50 bytes, encryption time required 2 ms using 1024 bits for synchronization technique asymmetric key algorithm. 
Proportional Derivative Active Force Control for “X? Configuration Quadcopter Tamami, Niam; Pitowarno, Endra; Astawa, I Gede Puja
Journal of Mechatronics, Electrical Power and Vehicular Technology Vol 5, No 2 (2014)
Publisher : Research Centre for Electrical Power and Mechatronics, Indonesian Istitutes of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3066.116 KB) | DOI: 10.14203/j.mev.2014.v5.67-74

Abstract

This paper present a control method “x? configuration quadcopter. The control method used PDAFC (Proportional Derivative Active Force Control). PD is used to stabilize quadcopter, and AFC is used to reject uncertainty disturbance (e.g. wind) by estimate disturbance torque value of quadcopter. By adding PD with AFC, better result is obtained, AFC can minimize uncertainty disturbance effect. The sensitivity toward uncertainty disturbance can be set from sensitivity constant to get best performance of disturbance rejection. Stability analysis of PDAFC was evaluated by Lyapunov stability theory.
Pemodelan Transmisi Citra dengan OFDM untuk Sistem DVB-T Prihantono, Prihantono; Astawa, I Gede Puja; Santoso, Tri Budi
Jurnal Arus Elektro Indonesia Vol 10 No 2 (2024)
Publisher : Fakultas Teknik, Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jaei.v10i2.47172

Abstract

Pada paper ini disajikan sebuah kajian tentang model transmisi citra dengan teknik OFDM, yang mana merupakan satu hal kunci di dalam implementasi DVB-T dan DVB-T2. Kajian telah dilakukan untuk mengevaluasi kehandalan sistem transmisi pada suatu kondisi kanal terburuk yang melibatkan proses multipath fading, dan mengujikan berbagai metode ekualisasi untuk mengetahui kehandalan sistem dalam mengatasi pengaruh kanal. Dari hasil pengujian melalui simulasi diperoleh gambaran bahwa untuk mendapatkan kinerja yang aman, dengan maksimum nilai error probability 0,001 ketiga system baik BPSK, QPSK dan 16QAM masih layak dimanfaatkan dengan system OFDM untuk implementasinya, walaupun ada sedikit perbedaan nilai SNR untuk BPSK + 6,7 dB, QPSK perlu +7 dB, dan 16QAM perlu + 9 dB. Pada pengujian teknik ekualisasi dengan LS dan MMSE juga menunjukkan kinerja yang bagus pada system OFDM. Dan pada bagian akhir menunjukkan proses tansmisi citra memberikan luaran sesuai yang diharapkan.
MANUFACTURE OF COOKING OIL CONTENT DRAIN CONTROL DEVICE IN OILY FOODS USING THE ESP32-BASED AND FUZZY LOGIC METHOD Nadia, Ninda Syafa Ainun; Astawa, I Gede Puja; Budikarso, Anang; Aswoyo, Budi; Anisah, Ida; Nadziroh, Faridatun
Transmisi: Jurnal Ilmiah Teknik Elektro Vol 26, No 2 April (2024): TRANSMISI: Jurnal Ilmiah Teknik Elektro
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/transmisi.26.2.53-63

Abstract

Cooking oil is an essential commodity in everyday life in Indonesia, with palm oil consumption reaching 18.5 million tons in 2021, according to the Indonesian Palm Oil Association (GAPKI). High levels of consumption can potentially increase the risk of health problems. To reduce oil consumption, slicing of food is required. However, this process is often done manually, which is less effective. Therefore, this study proposes the development of an automatic control device using the YF-S201 flow sensor, TCS3200 color sensor, and DS18B20 temperature sensor, which then processes the data using the fuzzy logic method. Data processing and monitoring are performed using ESP32, displaying results on the LCD and website. Data is stored in a MySQL database. The test was conducted on shrimp crackers weighing 0.5kg for 1 minute 25 seconds. This control device is hoped to help households, traders, and MSMEs as an effective and efficient solution. The characteristics of the three sensors, namely the TCS3200 colour sensor, flow sensor YF-S201, and temperature sensor DS18B20, it was found that the sensor had worked well as expected, with a maximum error percentage of 0.91%. In one of the tests to drain oil on oily crackers, the oil flow was detected to be 0.07 litres/minute of oil flowing out of the oil filter.
Performance Analysis of MIMO-OFDM System Using Predistortion Neural Network with Convolutional Coding Addition to Reduce SDR-Based HPA Nonlinearity Gulo, Melki Mario; Astawa, I Gede Puja; Sudarsono, Amang
EMITTER International Journal of Engineering Technology Vol 11 No 1 (2023)
Publisher : Politeknik Elektronika Negeri Surabaya (PENS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24003/emitter.v11i1.791

Abstract

In recent years, the development of communication technology has advanced at an accelerated rate. Communication technologies such as 4G, 5G, Wi-Fi 5 (802.11ac), and Wi-Fi 6 (802.11ax) are extensively used today due to their excellent system quality and extremely high data transfer rates. Some of these technologies incorporate MIMO-OFDM into their protocol. MIMO-OFDM is widely used in modern communication systems due to its benefits, which include high data rates, spectral efficiency, and fading resistance. Despite these benefits, MIMO-OFDM has disadvantages, with the use of a nonlinear HPA being one of them. Nonlinear HPA causes in-band and out-of-band distortions in MIMO-OFDM signals. Utilizing predistortion (PD) is one way of solving this issue. PD is a technique that uses the inverse distortion of the HPA to compensate for the nonlinear characteristics of the HPA. To enhance the quality of MIMO-OFDM systems that the use of HPA has degraded, the convolutional coding (CC) method can be combined with the help of PD. Convolutional coding is a type of channel coding that can be used for error detection and correction. This study will evaluate a combined technique of PD neural networks (PDNN) and CC on the MIMO-OFDM system using Software Defined Radio (SDR) devices. The evaluation of this system led to the use of a technique that combines PDNN and CC to improve SNR and minimise BER on MIMO-OFDM systems that HPA on SDR devices has degraded. In addition, at code rates 1/2, 2/3, and 3/4, using PDNN reduces the SNR value required to achieve BER equal to 0 by 12.037%, 37.8%, and 4.10% when compared to Digital Predistortion (DPD).
Evaluation of Joint Technique Iterative Clipping Filtering (ICF) and Neural Network Predistortion on SDR-based MIMO-OFDM System Gulo, Melki Mario; Astawa, I Gede Puja; Sudarsono, Amang; Moegiharto, Yoedy; Priambodo, Naufal Ammar; Gunawan, M. Wisnu
JOIV : International Journal on Informatics Visualization Vol 8, No 2 (2024)
Publisher : Society of Visual Informatics

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62527/joiv.8.2.1981

Abstract

Multiple-input, multiple-output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) is a communications technology that powers numerous modern communication systems, including 5G and WiFi-6. This technology is utilized in current communication systems due to its high performance and extensive channel capacity. MIMO-OFDM does have disadvantages, such as large Peak-to-Average Power Ratio (PAPR) values. If the signal is processed by a nonlinear Power Amplifier (PA) device, a high PAPR value signal can result in both in-band and out-of-band signal distortion. To combat high PAPR values, PAPR reduction strategies such as Iterative Clipping Filtering (ICF) are utilized. From this study, using ICF with iteration 2 and Clipping Ratios (CR) 3 and 4 can improve the system's minimum Bit Error Rate (BER) by about 22.8% and 91.1%, respectively. Choosing the correct CR will improve the system, but using the lower CR will make it worse than a system without ICF. This occurs in systems using ICF with iterations two and CR 2 and at the same SNR conditions as systems without ICF; using ICF with iterations two and CR 2 results in higher BER values. The use of Predistortion Neural Network (PDNN) can overcome this problem. By using PDNN, there is an improvement in the system where the minimum BER value can reach 0.1 × 10-5. The percentage decrease in BER from using PDNN for ICF with iterations two and CR 2, 3, and 4 is 99.88%, 99.86%, and 98.807%, respectively. Thus, the joint techniques of ICF and PDNN can significantly enhance the performance of MIMO-OFDM systems with nonlinear PA. Importantly, the experiment was conducted on an SDR device, ensuring the real-world applicability of the results.
Implementasi skema pengacakan subcarrier OFDM dengan algoritma RSA pada NI-USRP Sa’adah, Nihayatus; Astawa, I Gede Puja; Sudarsono, Amang
JURNAL ELTEK Vol. 20 No. 2 (2022): Oktober 2022
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/eltek.v20i2.354

Abstract

Keamanan jaringan nirkabel merupakan salah satu hal terpenting dalam sistem komunikasi. Karena sinyal dikirim dari pengirim melalui saluran nirkabel, tidak hanya penerima yang sah, tetapi juga penyadap dapat menangkap dan menyimpan sinyal informasi dengan mudah. Penelitian ini mengeksplorasi skema keamanan komunikasi nirkabel dimana skema yang digunakan adalah pengacakan subcarrier. Pemancar dan penerima harus disinkronkan untuk mengembalikan subcarrier ke posisi semula. Sistem ini menggunakan algoritma RSA sebagai sinkronisasi. Teknologi keamanan pengacakan subcarrier diimplementasikan pada sistem OFDM. Sistem OFDM diimplementasikan menggunakan perangkat USRP. Hasil yang diperoleh dari penelitian ini membuktikan bahwa teknik keamanan yang digunakan tidak menurunkan kinerja sistem, bahkan dapat mengurangi jumlah kesalahan bit akibat teknik sinkronisasi. Dengan teknik sinkronisasi algoritma RSA, dari jarak pengujian 1 meter, 2 meter, dan 5 meter. Pada jarak 1 meter didapatkan hasil terbaik dengan penurunan error bit dari 19,04% menjadi 0% pada 32-QAM dan penurunan error bit dari 28,57% menjadi 4,76% pada 64-QAM.   ABSTRACT Wireless network security is one of the essential things in communication systems. Since the signal is sent from the sender through a wireless channel, the legitimate receiver and eavesdropper can easily capture and store signal information. This study explores a wireless communication security scheme where the scheme used is subcarrier randomization. The transmitter and receiver must be synchronized to return the subcarrier to its original position. This system uses the RSA algorithm as synchronization. Subcarrier randomization security is implemented in OFDM system. OFDM system is implemented using USRP. The results from this study prove that security techniques don't reduce system performance, and can even reduce the number of errors due to synchronization techniques with RSA synchronization technique, with 1 meter, 2 meters, and 5 meters experiments. At 1meter distance is the best result with bit error drop from 19.04% to 0% on 32-QAM and a bit error drop from 28.57% to 4.76% on 64-QAM.
Sistem Sirkulasi Air Kolam Otomatis Berdasarkan Nilai pH Ramadhani, Afifah Dwi; Sudarsono, Amang; Pratiarso, Aries; Yuliana, Mike; Ningsih, Norma; Hadi, Mochammad Zen Samsono; Kristalina, Prima; Satiti, Rini; Astawa, I Gede Puja; Siswanto, Anang
PUBLIKASI PENGABDIAN KEPADA MASYARAKAT Vol 4 No 1 (2024)
Publisher : Fakultas Ekonomi dan Bisnis Universitas Multi Data Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35957/padimas.v4i1.6714

Abstract

Banyak petani dari berbagai lapisan masyarakat, baik itu dari kalangan menengah atas maupun kalangan bawah yang memiliki lahan terbatas, beralih ke praktik pertanian modern seperti aquaponik. Pendekatan ini tidak hanya efisien dalam penggunaan ruang dan waktu, tetapi juga mampu menghasilkan panen yang optimal melalui perawatan yang cermat. Dengan memonitoring pH air menjadi langkah penting dalam menilai kualitas air yang dapat memberikan informasi mengenai kondisi baik atau buruknya. Air yang memiliki kualitas buruk dapat menimbulkan dampak negatif terhadap kesehatan ikan, seperti munculnya berbagai penyakit. Perubahan pH air juga dapat mengakibatkan perubahan aroma, rasa, dan warna air. Oleh karena itu, penelitian ini bertujuan untuk merancang dan menerapkan suatu sistem yang berfungsi untuk memantau tingkat keasaman (pH) dalam air, dengan memanfaatkan kemajuan teknologi saat ini. Pengukuran pH air dapat dilakukan secara manual menggunakan pH meter pada mikrokontroler. Oleh karena itu, dikembangkan sistem pemantauan untuk mempermudah pengendalian pH air, sehingga proses pembenihan ikan dapat ditingkatkan dan disederhanakan. Pada pengujian sensor pH, ketika terdeteksi nilai pH di luar kisaran netral misalnya 7,71 maka sistem sirkulasi air akan aktif untuk mengoreksi pH kolam agar mencapai kondisi netral. Hal ini bermanfaat untuk menjaga kualitas air kolam.
Co-Authors Abd. Rasyid Syamsuri Ahmad Zainudin Amang Sudarsono, Amang Anang Budikarso, Anang Anang Siswanto, Anang Anisah, Ida Ari Wijayanti Aries Pratiarso, Aries Arifin Arifin Astin, Novita Astin, Novita Budi Aswoyo, Budi Endra Pitowarno Gulo, Melki Mario Gunawan, M. Wisnu Hadi, Mochammad Zen Samsono Hendy Briantoro Hudhajanto, Rizky Pratama Hudhajanto, Rizky Pratama Kurniajaya, Moga M Udin Harun Al Rasyid, M Udin Harun Mahendra, Trisna Agung Mala Nurilmala Mike Yuliana Mohamad Ridwan Nadia, Ninda Syafa Ainun Nadziroh, Faridatun Niam Tamami Ni’am Tamami, Ni’am Ningsih, Norma Okkie Puspitorini, Okkie Priambodo, Naufal Ammar Prihantono, Prihantono Prima Kristalina Putra, Adam Surya Raihan, Dafa Ramadhani, Afifah Dwi Sa'adah, Nihayatus Salwadilla, Ika Shafira Satiti, Rini Sa’adah, Nihayatus Subono ., Subono Taufiqurrahman, Muh. Alfan Taufiqurrahman, Muh. Alfan Tri Budi Santoso Wahyu, Gilang Arya Yoedy Moegiharto, Yoedy Yudha, Kurniawan Try Yudha, R. Gaguk Pratama Yudha, R. Gaguk Pratama