Articles
<![CDATA[Underwater Acoustic Channel Characterization of Shallow Water Environment ]]>
<![CDATA[Tri Budi Santoso]]>;
<![CDATA[Endang Widjiati]]>;
<![CDATA[Wirawan Wirawan]]>;
<![CDATA[Gamantyo Hendrantoro]]>
<![CDATA[ EMITTER International Journal of Engineering Technology Vol 6 No 1 (2018) ]]>
Publisher : <![CDATA[Politeknik Elektronika Negeri Surabaya (PENS) ]]>
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DOI: 10.24003/emitter.v6i1.243
<![CDATA[Understanding of channel propagation characteristics is a key to the optimal design of underwater acoustic communication. Generally, modelling of underwater acoustic channel is performed based on measurement result in certain site at certain times. Different sites might have different characteristics, each of which can generally be described by a model obtained by averaging measurement results at multiple points in the same environment. This paper describes a characterization of the underwater acoustic channel of tropical shallow water in a Mangrove estuary, which has sediment up to 60 cm at the bottom. Such a channel model is beneficial for the design of communication system in an autonomous underwater vehicle, for instance. The measurement result of delay spread parameter from three different points with the distance of 14 ~ 52 m, has various values. The root mean square (RMS) of delay spread ranges between 0.0621 ~ 0.264 ms, and the maximum delay spread varies with the value of 0.187 ~ 1.0 ms. The pdf fitting shows that Rayleigh distribution describes the fading variation more accurately than Nakagami and Ricean.]]>
<![CDATA[Application of Adaptive QAM Modulation and Diversity Scheme for 30 GHz Cellular Communications under the Impact of Rain Attention in Indonesia ]]>
<![CDATA[Gamantyo Hendrantoro]]>;
<![CDATA[Achmad Mauludiyanto]]>;
<![CDATA[Ninik D. Yundariani]]>
<![CDATA[ IPTEK The Journal for Technology and Science Vol 18, No 3 (2007) ]]>
Publisher : <![CDATA[IPTEK, LPPM, Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/j20882033.v18i3.167
<![CDATA[In millimeter-wave wireless cellular systems like Local Multipoint Distribution Services (LMDS) rain attenuation is an essential factor of performance degradation. It can cause signal outages and poor quality of signal reception. To mitigate the problem, a combination of diversity and adaptive modulation is proposed. To investigate the impact of the use of these techniques, a simulation is performed for a 30 GHz cellular system to obtain SNR (signalto- noise ratio), diversity gain, modulation level and BER (bit error rate). Analysis of the implementation of the combined techniques is accomplished by taking into account such factors as length of links and the combining method Simulation results show that diversity can improve the overall system SNR. Diversity gain of up to 15 dB can be achieved on two 4-km converging links at 0.01% outage probability when maximal-ratio combining (MRC) is used. For systems with luxurious link design for which the clearsky SNR is more than 30 dB, as considered in this paper, diversity and adaptive modulation do not significantly contribute to improvement of achievable transmission rate and BER performance. However, for systems with lower values of clear-sky SNR, use of both techniques will be more worthwhil.]]>
<![CDATA[Improve the Robustness of Range-Free Localization Methods on Wireless Sensor Networks using Recursive Position Estimation Algorithm ]]>
<![CDATA[Prima Kristalina]]>;
<![CDATA[Wirawan Wirawan]]>;
<![CDATA[Gamantyo Hendrantoro]]>
<![CDATA[ Journal of ICT Research and Applications Vol. 5 No. 3 (2011) ]]>
Publisher : <![CDATA[LPPM ITB ]]>
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DOI: 10.5614/itbj.ict.2011.5.3.4
<![CDATA[The position of a sensor node at wireless sensor networks determines the received data sensing accuracy. By the knowledge of sensor positioning, the location of target sensed can be estimated. Localization techniques used to find out the position of sensor node by considering the distance of this sensor from the vicinity reference nodes. Centroid Algorithm is a robust, simple and low cost localization technique without dependence on hardware requirement. We propose Recursive Position Estimation Algorithm to obtain the more accurate node positioning on range-free localization technique. The simulation result shows that this algorithm has the ability on increasing position accuracy up to 50%. The trade off factor shows the smaller the number of reference nodes the higher the computational time required. The new method on the availability on sensor power controlled is proposed to optimize the estimated position.]]>
<![CDATA[Dynamic Overlapping Clustering for Wireless Sensor Networks Based-on Particle Swarm Optimization ]]>
<![CDATA[Amin Suharjono]]>;
<![CDATA[Wirawan Wirawan]]>;
<![CDATA[Gamantyo Hendrantoro]]>
<![CDATA[ Journal of ICT Research and Applications Vol. 6 No. 1 (2012) ]]>
Publisher : <![CDATA[LPPM ITB ]]>
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DOI: 10.5614/itbj.ict.2012.6.1.3
<![CDATA[In the recent years, Wireless Sensor Network (WSN) has been one of the most interesting research topics because of its flexibility and many potential applications. However, in the applications, there are still resources constraints, including: energy, computation, and bandwidth. It is believed that clustering is the best solution for the need of energy efficiency and scalability. In order to reach the high level of energy efficiencies, mostly, the clustering algorithms avoid the possibility of overlap between clusters. But in fact, there are several applications that need the occurrence of overlaps between clusters. In this paper, we propose a Particle Swarm Optimization (PSO)-based Clustering algorithm that has capability to control the overlap between clusters but still it has an ability to reach energy efficiency. PSO is chosen because it has a light computation and can quickly reach convergence. This proposed algorithm performance is analytically and experimentally compared with clustering on LEACH. The result of the test shows that this proposed algorithm has a capability to control the rate of overlapping degree linearly. The testing on the PSO for clustering also shows the better performance than on LEACH, although there are a few problems related to its complexity.]]>
<![CDATA[The Attenuation Characteristics of the Body Tissue on Frequency Function in WBAN Channel ]]>
<![CDATA[Achmad Mauludiyanto]]>;
<![CDATA[Gamantyo Hendrantoro]]>;
<![CDATA[Muhammad Fachry Nova]]>
<![CDATA[ JAREE (Journal on Advanced Research in Electrical Engineering) Vol 5, No 2 (2021): October ]]>
Publisher : <![CDATA[Department of Electrical Engineering ITS and FORTEI ]]>
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DOI: 10.12962/jaree.v5i2.185
<![CDATA[The Wireless Body Area Network (WBAN) refers to a communication network between sensors placed on the inside, on the surface, or around the body wirelessly. WBAN system cannot be separated from body tissues. Body tissues also have electrical properties depending on frequency. Therefore, body tissue can affect the phenomena occurring in radio wave propagation in the WBAN channel. One of the phenomena is attenuation. This study investigates the impacts of body tissue on the WBAN channel and the effects of frequency on the attenuation of body tissue in the WBAN channel. The measurement of magnitude response was carried out with the human body as the measurement object by utilizing the S21 parameter measurement with a vector network analyzer. In NLOS conditions, a human body was located between two coplanar Vivaldi antenna. Measurements were conducted on the head, chest, and abdomen. The frequency used was in the range of 2 GHz to 6 GHz. The body tissue attenuation was obtained by finding the difference between the magnitude measurement response on the LOS and NLOS conditions. The attenuation data were analyzed using statistical and numerical analysis to determine the effect of frequency on the attenuation of the human body tissues. Based on the analysis results, it was identified that the frequency affected the human body tissue attenuation. The enhancement attenuation of the human body tissues occurred when the frequency was higher. Moreover, there was a significant difference in the body tissue attenuation in different parts of the body.Keywords: attenuation, body tissues, s-parameters, wireless body area network.]]>
<![CDATA[Wideband Metamaterial Absorber Based on Combination of Unit Cells ]]>
<![CDATA[Puji Handayani]]>;
<![CDATA[Eko Setijadi]]>;
<![CDATA[Muhammad Rendy Anggara]]>;
<![CDATA[Gamantyo Hendrantoro]]>;
<![CDATA[Ahmad Maulidiyanto]]>
<![CDATA[ JAREE (Journal on Advanced Research in Electrical Engineering) Vol 4, No 2 (2020): October ]]>
Publisher : <![CDATA[Department of Electrical Engineering ITS and FORTEI ]]>
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DOI: 10.12962/j25796216.v4.i2.135
<![CDATA[Metamaterial absorber is an electromagnetic wave absorber made from metamaterial. It basically works in narrow band frequency as it is designed in a particular shape that related to its resonance frequency. However, some applications, e.g., anechoic chamber, require metamaterial absorber that can work in a wide frequency band. This paper discussed the design of wide band metamaterial absorber using the combination of multiple unit cells. The unit cells type was split ring resonator (SRR). SRR had advantages in terms of its simple shape, it could have more than one resonant frequencies depending on the number of its ring, and its shape could be modified easily to obtain the desired resonant frequencies. We designed metamaterial absorber having good absorbtion rate in 2-10 GHz frequency band. To cover this wide frequency band, we used five unit cells which were arranged on a flat plane. Each unit cell had several resonant frequencies. The design was carried out using simulation software of CST (Computer Simulation System). The fabricated design was measured and the results shown that it had an absorbtion rate of 99% in the measured frequency band.Keywords: absorption rate, metamaterial absorber, unit cell.]]>
<![CDATA[STUDI PERBANDINGAN REDAMAN HUJAN MENGGUNAKAN FREKUENSI 15 GHz DARI HASIL PENGUKURAN SECARA LANGSUNG DAN HASIL SIMULASI METODE SST (SYNTHETIC STORM TECHNIQUE) ]]>
<![CDATA[Riyan Eka Pratama]]>;
<![CDATA[Achmad Mauludyanto]]>;
<![CDATA[Gamantyo Hendrantoro]]>
<![CDATA[ SinarFe7 Vol. 1 No. 1 (2018): Sinarfe7-1A 2018 ]]>
Publisher : <![CDATA[FORTEI Regional VII Jawa Timur ]]>
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<![CDATA[Pada sistem komunikasi gelombang mikro line of sight (LOS), pada frekuensi di atas 10 GHz sangat rentan terhadap redaman terutama redaman hujan khususnya di negara-negara tropis seperti indonesia dengan curah hujan yang cukup tinggi, karena bisa menurunkan performansi dari sistem komunikasi ini. Terkait dengan hal di atas, parameter penting di dalam melakukan desain sistem komunikasi point to point ini adalah redaman hujan, yang harus ditentukan besarannya sebagai dasar pertimbangan untuk mendapatkan kestabilan sistem komunikasi pada umumnya. Penelitian ini adalah melakukan pengukuran intensitas curah hujan secara langsung, dan untuk selanjutnya akan ditentukan nilai prediksi redaman hujan dengan metode Synthetic Storm Technique (SST), yang diperoleh melalui penentuan rain rate berdasarkan curah hujan hasil pengukuran raingauge dengan parameter k dan α didasarkan pada rekomendasi ITU-R P.838-3 2005 dengan faktor koreksi A dan juga perhitungan prediksi redaman hujan SST dengan k dan α dari proses regresi line r. Hasil nilai prediksi redaman SST dari kedua metode tersebut di atas dibandingkan dengan hasil pengukuran redaman hujan secara langsung pada link komunikasi 15 GHz. Sebagai langkah terakhir dari pelaksanaan penelitian ini adalah pemilihan metode penentuan redaman SST yang memiliki jumlah kuadrat kesalahan (sum of square error) terkecil.]]>
<![CDATA[Linear Array Thinning with Cavity backed U-slot Patch Antenna using Genetic Algorithm ]]>
<![CDATA[Novalia Pertiwi]]>;
<![CDATA[Fannush Shofi Akbar]]>;
<![CDATA[Eko Setijadi]]>;
<![CDATA[Gamantyo Hendrantoro]]>
<![CDATA[ Journal of Science and Applicative Technology Vol 5 No 1 (2021): Journal of Science and Applicative Technology June Chapter ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia ]]>
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DOI: 10.35472/jsat.v5i1.386
<![CDATA[In this paper, a thinned linear array with Cavity backed U-slot Patch has been investigated using the Genetic Algorithm to minimize peak sidelobe level and the number of antenna elements. One of the essential steps in the Genetic Algorithm method is a crossover, which uses the Paired Top Ten and Combined Top Five rules applied to the Cavity backed U-slot Patch antenna. The peak sidelobe level value is -18.63 dB with a array filling of 63.33% at the broadside angle using Combined Top Five rules. In Paired Top Ten, the peak sidelobe level value is -19.48 dB with a array filling of 70%. The two methods are still better as compared to a dense array. This study is essential in the development of radar technologies since it needs a low sidelobe level.]]>
<![CDATA[Subarray 4×4 untuk Antena MIMO 5G dengan Elemen yang Menerapkan Teknik Parasitic ]]>
<![CDATA[Fitri Amillia]]>;
<![CDATA[Eko Setijadi]]>;
<![CDATA[Gamantyo Hendrantoro]]>
<![CDATA[ Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 12 No 1: Februari 2023 ]]>
Publisher : <![CDATA[Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada ]]>
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DOI: 10.22146/jnteti.v12i1.5310
<![CDATA[Multiple-input multiple-output (MIMO) is a wireless communication system using multiple antennas on the transmitting and receiving sides. This system can improve the quality of wireless communication on 5G technology networks. The advantages of 5G include higher data rates and lower delays. The 5G network in Indonesia uses an intermediate frequency working in the 3.5 GHz frequency band. Antenna is an important device in a wireless network MIMO system. Therefore, this study proposes a single element design using parasitic techniques to widen the bandwidth to meet the needs of MIMO antennas and design a 4×4 subarray antenna for 5G MIMO. The method used began with determining the target antenna specifications, then designing a single element with a parasitic patch. The use of parasitic patches techniques on antenna elements aims to widen the bandwidth to meet target specifications. The resonant frequency of the microstrip antenna was affected by the increase in the number of parasitic patches. The number of resonant frequencies that arise resulted in a broad bandwidth. Then, the single elements with parasitic patches were arranged into a 4x4 subarray. All elements were arranged on the same substrate with a spacing between elements from one feed point to another was 64.28 mm or 0.75λ. The subarray design met the target antenna specifications if the subarray elements have a fractional bandwidth of more than 20% and mutual coupling of less than -20 dB. The material used in antenna design and fabrication was FR-4 (epoxy) substrate with a dielectric constant (ε_r) of 4.3 and a substrate thickness (h) of 1.6 mm. The results showed a bandwidth of 735 MHz or a fractional bandwidth of 20.35%, return loss of -14.65 dB, mutual coupling of -30.05 dB, and gain of 16.86 dB. Thus, the designed 4x4 subarray for MIMO antenna meets the desired specifications.]]>
<![CDATA[Implementasi Workshop Penyegaran Bagi Dosen dan Sarjana Bidang Telekomunikasi di Luar Jawa dan Indonesia Timur dengan Kombinasi Metode Daring Sinkron dan Asinkron ]]>
<![CDATA[Gamantyo Hendrantoro]]>;
<![CDATA[Prasetiyono H Mukti]]>;
<![CDATA[Devy Kuswidiastuti]]>;
<![CDATA[Puji Handayani]]>;
<![CDATA[Achmad Mauludiyanto]]>;
<![CDATA[Sri Rahayu]]>;
<![CDATA[Eko Setijadi]]>
<![CDATA[ Sewagati Vol 4 No 3 (2020) ]]>
Publisher : <![CDATA[Pusat Publikasi ITS ]]>
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<![CDATA[Keterbatasan prasarana telekomunikasi dan informasi menyulitkan para dosen dan sarjana teknik yang berkarya di wilayah Indonesia timur dalam mengakses buku, jurnal, serta informasi ilmiah untuk menjaga penguasaan keilmuan dan mengikuti perkembangan teknologi di bidangnya, sesuai dengan hasil survey awal kami. Sebagai solusi, kami melaksanakan penyegaran dan peningkatan kapasitas sarjana secara daring dengan berfokus pada sarjana Teknik Elektro bidang Telekomunikasi. Pelaksanaan secara daring memungkinkan untuk menjangkau wilayah geografis yang luas di Indonesia timur. Materi yang disampaikan meliputi materi dasar, perkembangan teknologi terbaru, dan regulasi telekomunikasi, sesuai umpan balik para responden. Setiap minggu selama 13 minggu dilaksanakan workshop daring sinkron menggunakan Zoom dan Live Youtube dengan tes pasca-workshop berbasis Kahoot. Rekaman video workshop di Youtube dapat diputar oleh peserta yang tidak dapat hadir langsung, sedangkan diskusi dilanjutkan secara asinkron melalui grup Whatsapp. Survey akhir menunjukkan besarnya animo peserta, peningkatan pemahaman materi, dan apresiasi peserta terhadap inisiatif ini. Apresiasi khusus diberikan oleh peserta yang memiliki keterbatasan akses internet sehingga sulit mengikuti workshop secara sinkron, tetapi masih dapat mengikuti workshop dan diskusi secara asinkron. Tim pengabdi mengharapkan metode serupa dapat diterapkan dalam kegiatan penyegaran dan pelatihan di bidang yang lain bagi para dosen dan sarjana yang berkarya di luar Jawa dan khususnya Indonesia Timur.]]>
