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All Journal Jurnal Teknologi Proceeding of the Electrical Engineering Computer Science and Informatics Conference SENATIK STT Adisutjipto Yogyakarta Angkasa: Jurnal Ilmiah Bidang Teknologi Compiler KACANEGARA Jurnal Pengabdian pada Masyarakat Aviation Electronics, Information Technology, Telecommunications, Electricals, Controls (AVITEC) International Journal of Engineering, Technology and Natural Sciences (IJETS)
Catur Budi Waluyo, Catur Budi
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Aerospace Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Journal : Angkasa: Jurnal Ilmiah Bidang Teknologi

 1 
ANALISIS PENINGKATAN KAPASITAS SISTEM SELULER 4G LTE PADA SISTEM KOMUNIKASI HIGH ALTITUDE PLATFORM STATION Waluyo, Catur Budi; Astuti, Yenni
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 9, No 1 (2017): Mei
Publisher : Sekolah Tinggi Teknologi Adisutjipto

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Abstract

In the development o f wireless communications, to provide high-speed data services and wide bandwidth become a challenge. One technique to make it happen is by using Multicarrier Orthogonal Frequency Division Multiplexing (OFDM) modulation, where in OFDM, frequency selective fading channel effect will be perceived flat fading by each subcarrier. One communication system that supports OFDM technology is Long Term Evolution (LTE) with various types of bandwidth configurations provided. To improve LTE performance in capacity building, coverage area and data rate, it can use multi antenna technique both in receiver and sender, and integrate with High altitude platform station (HAPs) system. In this study the estimation used is Linear Minimum Mean Square (LMMSE). The relationship o f the elevation angle and the K factor is directly proportional, but the elevation angle value is inversely proportional to the diameter o f the HAPs coverage area. In addition, the more the number o f used antennas, the greater the capacity served. Based on the simulation results, the system with estimation can be used to expand the coverage area to 215.77 km which is from 0.032 km in QPSK modulation, speed 60 kmpj with 2x2 antennas.
ANALISIS MIMO UNTUK PENINGKATAN KAPASITAS SISTEM SELULER 4G LTE PADA SISTEM KOMUNIKASI HIGH ALTITUDE PLATFORM STATION Waluyo, Catur Budi
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 8, No 2 (2016): November
Publisher : Sekolah Tinggi Teknologi Adisutjipto

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Abstract

The development of technology has opened up a new wireless infrastructure to complement the satellite and terrestrial networks. High Altitude Platforms (HAPs) is a communications infrastructure that uses air balloon as a solution between terrestrial and satellite communications systems with medium coverage and low cost o f launching and maintenance. HAPs can be joined with a Long Term Evolution (LTE) technology standardized by the Third Generation Partnership Project (3GPP). LTE uses orthogonal frequency division multiplexing (OFDM) technology for downlink. OFDM technology is a technology that uses multicarrier and bring the data in parallel and the bandwidth is divided into several subcarrier. To improve the performance of LTE in an increase in capacity, coverage, and speed of data, then it can use MIMO techniques. MIMO is a technique using multiple antenna transmitter and receiver antennas that are used to overcome the problem of multipath fading and increase the capacity of the system to be serviced. MIMO support the achievement of high transmission speed. In the simulation, signals generated by the modified jakes model into a ricean channel using the K factor 1.41, 1.99, 2.33, 2.66, 4.61, 6.35, 9.21, 12.15, 16.77 dB with elevation angle of 1 0 ° to 90°. The larger the K factor, the smaller the shift doppler at each speed. Elevation angle have a relationship to the coverage area of HAPs, the smaller the elevation angle of the wider the coverage area, and the higher the position, the wider HAPs coverage area too. In ergodic capacity, the smaller the K factor, the smaller the elevation angle so that the capacity is also greater. System without estimation for the K factor o f 1.41dB and K 9.21dB is necessary for channel estimation and the Bit Error Rate (BER) o f the same system that made channel estimation has a better performance compared with the existing channel without estimation with the SNR improvement o f about 18 dB.
Design and Development of 72.83 MHz Signal Booster Transmitter to increase the remote control coverage Waluyo, Catur Budi
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 10, No 2 (2018): November
Publisher : Sekolah Tinggi Teknologi Adisutjipto

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Abstract

Pada perkembangan komunikasi wireless, pengendalian suatu pesawat tanpa awak dengan jarak yang jauh merupakan sebuah tantangan. Salah satu teknik untuk mewujudkannya yaitu dengan menggunakan penguat sinyal (signal booster) yang dapat menambah jangkauan dari pengendali pesawat tersebut. Pada pengendali pesawat tanpa awak menggunakan Remote Control (RC).Signal booster yang dioperasikan pada frekuensi 72,83 MHz ini dirancang dengan empat tingkat penguat dengan transistor seri 2SC930, 2SC2053 dan 2SC1971. Signal booster ini dirancang dioperasikan pada kelas A untuk tingkat I, II, III, dan kelas C untuk tingkat IV dengan pangkaian penyesuai impedansi yang digunakan yaitu tipe T dan L. Pada bagian transmiter digunakan antena omnidirectional.Berdasarkan perancangan frekuensi yang digunakan 72.83MHz dengan bandwidth 30kHz. Level puncak amplituodo yang dihasilkan sebesar -27dBm dengan dengan reference level 0 dBm. Hasil pengukuran menunjukkan penguat dapat bekerja pada frekuensi 72,83 MHz dengan daya keluaran 4,5 watt atau gain sebesar 16,58 dB dan mendekati hasil perancangan. Voltage Standing Wave Ratio (VSWR) yang diukur sebesar 1.1 dengan batas minimal VSWR yaitu 1.Kata kunci: Signal booster, Penguat, Remote Control In the development of wireless communication, the development of Unmanned Aerial Vehicle a long distance is a challenge. One technique to make it happen is by using a signal amplifier that can add facilities to the Unmanned Aerial Vehicle controller using Remote Control (RC).The signal amplifier that operates at 72.83 MHz frequency is designed with four amplifier levels with 2SC930, 2SC2053 and 2SC1971 series transistors. This signal amplifier is designed to operate in class A for levels I, II, III, and class C for level IV with impedance adjustment circuits namely type T and L. On the part of the omnidirectional transmitter antenna.According to the designer, the frequency used is 72.83MHz with a bandwidth of 30kHz. The amplitudo peak level produced is -27dBm with a reference level of 0 dBm. High results indicate the amplifier can work at a frequency of 72.83 MHz with power ranging from 4.5 watts or gain of 16.58 dB and approaching the designers results. Voltage Standing Wave Ratio (VSWR) which measures 1.1 with a minimum VSWR limit of 1.Keywords: signal amplifier, amplifier, remote control 
PERFORMANCE ANALYSIS OF DOPPLER SHIFT ON VEHICLE SPEED WITH JAKES MODEL Waluyo, Catur Budi; Setiawan, Paulus
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 11, No 2 (2019): November
Publisher : Sekolah Tinggi Teknologi Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (7022.491 KB) | DOI: 10.28989/angkasa.v11i2.485

Abstract

The development of communication is increasing in the last decade, so that new infrastructure and technology emerge. The technology used to realize this time, is not only by using multi antenna technique, but also used orthogonal frequency division multiplexing (OFDM). But on systems that use OFDM will be sensitive to the effects of Doppler shifts and will result in inter carrier interference (ICI). To compensate for the influence of the Doppler shift on the HAPS communication system with ricean canals, a modified jakes model is needed. Based on the simulation, the ricean canal (HAPS communication system) has a small slope width so that it has characteristics close to LOS. The calculation of the Doppler shift in this study showed that the higher the speed, the greater the Doppler shift value while the greater the K factor, the smaller the Doppler shift value. So that the higher the K factor, the communication system is getting closer to LOS, the damping and noise values are getting smaller.
Co-Authors Bambang Sudibya, Bambang Benedictus Mardwianta, Benedictus Denny Dermawan Erik, Alber Hidayat, Arif Dwi Iskandar Iskandar Lasmadi Oswald Richfild Tambunan Prayoga, Noor Fita Indri Purnomo, M. Jalu Setiawan, Paulus Wijanarko, Sidiq Yenni Astuti, Yenni