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Transmisi: Jurnal Ilmiah Teknik Elektro
Published by Universitas Diponegoro
ISSN : -     EISSN : 24076422     DOI : -
Core Subject : Education,
Education
Arjuna Subject : -
Articles 4 Documents
 1 
Search results for , issue "Vol 11, No 4 (2009): TRANSMISI" : 4 Documents clear
Design of Very High Throughput WLAN System for 4K Digital Cinema Transmission Syafei, Wahyul Amien; Ochi, Hiroshi
Transmisi Vol 11, No 4 (2009): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (376.662 KB) | DOI: 10.12777/transmisi.11.4.166-171

Abstract

We proposed a design of a Very High Throughput Wireless LAN system. It reaches 33 meter propagation distance by using 80 Mhz bandwidth on 5 GHz band. The proposed preamble has backward compatibility with IEEE802.11n system, allows band sharing and avoids collision within 5 GHz band. The proposed preamble has comparable PAPR and preamble efficiency with IEEE892.11n system. Run test for transmitting 90 frames of 4K image size with 24 bit per pixel resolution for digital cinema simulation under in-door channel model demonstrates the excellent performance of the proposed system. Keywords: VHT WLAN, backward compatibility, PAPR, preamble efficiency, digital cinema transmission
Redundant Capasitive Sensor untuk Pendeteksi Gelembung Udara Fault Tolerance Basjaruddin, Noor Cholis
Transmisi Vol 11, No 4 (2009): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (782.836 KB) | DOI: 10.12777/transmisi.11.4.172-176

Abstract

Detection of air bubbles in the blood is important for various medical treatments that use Blood Extracorporeal Circuits (ECBC), such ashemodialysis, hemofiltration, and cardio pulmonary bypass. Therefore we need a reliable detection of air bubbles. In this research designed capasitive redundant sensors for detecting air bubbles fault tolerance. A Triple Modular Redundancy (TMR) method is used to select the output capacitor of the three sensors mounted on the blood hose. TMR module will choose the middle of three sensors output value. Application of TMR will prevent errors in the detection of air bubbles resulting from the failure of the sensor. Keywords: air bubble detection, triple modular redundancy (TMR) , extracorporeal blood circuits
Analisis Perpindahan Kanal Komunikasi dalam Satu BSC pada Sistem GSM Berdasarkan Data Drive Test Menggunakan TEMS Investigation 4.1.1 Luluk Arifatul Chalida; Imam Santoso; Yuli Christyono
Transmisi: Jurnal Ilmiah Teknik Elektro Vol 11, No 4 (2009): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (320.413 KB) | DOI: 10.12777/transmisi.11.4.183-192

Abstract

Mobile communications system created to meet the communication needs that can be done anywhere either when user is motionless or moving. To maintain the quality of services in a wide service area, coverage area is divided into smallest geographic units called cells. If the user moves from one area of the cell to another, then it needs an algorithm that guarantees the continuity of communications services. These algorithm is called a handover to a dedicated mode and the cell reselection for idle mode. In observing handoff algorithm, the operator did a drive test using computer and handset, which each had been equipped with special software, and GPS. This research analyze the problems related to the handoff algorithm, both when in idle mode or dedicated mode, including the causes, processes and things that influence it. Data acquisition is carried out through a drive test using software TEMS Investigaions GSM 4.1.1 with routes in the downtown area of Semarang. Drive test held on every Thursday and Sunday for three consecutive weeks starting on August 23, 2009 and each of day divided into three time allocation, ie morning, noon and night. The observed event include: cell reselection, handover, handover (intracell), handover failure and intracell handover failure. In addition Information Element that effected on the event are also observed, path loss criteria and cell reselection criteria for cell reselection, and received power, bit error rate and timing advance for the four other events. From the analysis is known that the assignment channel is triggered by the Information Element value that reaches a certain threshold value. For cell reselection, the both Information Element having equal influence. Information Element of the most influential for the handover and the handover failure is received power, whereas for two other events the most influential is the received bit error. After the detected value of the Information Element reaches a certain threshold, MSC will instruct the candidate cell to monitor and serving mobile station. Different process going on for handover (intracell), which after the information element value is known at a certain threshold, MS will move to another traffic channel in the same cell. If handover (intracell) was requested but could not be performed then handover based quality is tried the next time (if criterion is still given). When this handover also fails then BS toggles back and tries again a handover (intracell). In this drive test result there are 15 handover failures that may because no available traffic channel in candidate cell. There is only once handover intracell failure happened which may be caused by full traffic in candidate channel, but no cell reselection failure is found because this event doesn’t need traffic channel but only signaling channel. Keywords: handover, cell reselection, intracell, IE, TEMS
T-S Fuzzy Model Design for Engine Torque Control System of Spark Ignition Engine Triwiyatno, Aris; Nuh, Mohammad; Santoso, Ari; Sutantra, I Nyoman
Transmisi Vol 11, No 4 (2009): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1839.366 KB) | DOI: 10.12777/transmisi.11.4.177-182

Abstract

On many occasions, fuzzy rule-based systems have been demonstrated to be powerful tools in modeling, decision making and automatic control. The T-S model approach consists to construct nonlinear or complex dynamic systems that cannot be exactly modeled by mathematical model, by means of interpolating the behavior of several LTI (Linear Time Invariant) sub models. In this paper, a new modification fuzzy model based on T-S model will be designed to represent engine torque control system of spark ignition engine, since spark ignition engine is a high non linear system with wide uncertainties that very difficult to be modeled by mathematical model. Keywords: T-S model, fuzzy model, engine torque, spark ignition engine.

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