Teguh Prakoso | Diponegoro University (original) (raw)

Papers by Teguh Prakoso

Journal of Physics: Conference Series, 2020

Signal always occurs with noise. Since noise acts as an unwanted signal, we must clear or reduce ... more Signal always occurs with noise. Since noise acts as an unwanted signal, we must clear or reduce it with some denoising method. It is relatively easy to denoise the normal distribution noise-contaminated the periodic signal. The problem ascends if a non-Gaussian noise intrudes into a non-periodic signal. The standard filter, such as DWT (discrete wavelet transforms), cannot overcome this directly and blindly. In this research, we proposed ANFIS (Adaptive Neuro-Fuzzy Inference System) as a non-periodic noisy signal denoising method. Foremost, the ANFIS trained to mimic or estimate the interfered noise, then this noise estimation used as a subtractive signal in a non-periodic noisy signal. As a result, the ANFIS can reduce the non-Gaussian noise in the various noisy non-periodic signals with minimum error better than standard DWT (Discrete Wavelet Transform).

IOP Conference Series: Materials Science and Engineering, 2017

Common weight scales cannot assess body composition or determine fat mass and fat-fress mass that... more Common weight scales cannot assess body composition or determine fat mass and fat-fress mass that make up the body weight. This research propose bio-impedance analysis (BIA) tool capable to body composition assessment. This tool uses four electrodes, two of which are used for 50 kHz sine wave current flow to the body and the rest are used to measure the voltage produced by the body for impedance analysis. Parameters such as height, weight, age, and gender are provided individually. These parameters together with impedance measurements are then in the process to produce a body fat percentage. The experimental result shows impressive repeatability for successive measurements (stdev ≤ 0.25% fat mass). Moreover, result on the hand to hand node scheme reveals average absolute difference of total subjects between two analyzer tools of 0.48% (fat mass) with maximum absolute discrepancy of 1.22% (fat mass). On the other hand, the relative error normalized to Omron's HBF-306 as comparison tool reveals less than 2% relative error. As a result, the system performance offers good evaluation tool for fat mass in the body.

IOP Conference Series: Materials Science and Engineering, 2017

Skew-planar antenna is suitable for unmanned aerial vehicles (UAVs) since it has circular polariz... more Skew-planar antenna is suitable for unmanned aerial vehicles (UAVs) since it has circular polarization (avoiding polarization-mismatched), omnidirectional radiation pattern (low pointing loss) thus comply with maneuver angles of UAV, and also small size. Investigation with electromagnetic simulations shows that tilt angle and coaxial length are the most sensitive parameters. Modified design with 55° tilt angle (original design: 45°) and 100 mm coaxial length (original: 60 mm) potentially provides wider bandwidth (400 MHz vs. 290 MHz), better impedance-matched (|S |:-47.1 dB vs.-13.6 dB), and better gain (1.98 dBi vs 1.61 dBi). The antenna is predicted capable to support service distance of 3 km in 2.4 GHz band if used with communication module with 18 dBm transmit power and-100 dBm receiver sensitivity. Therefore, the modified antenna is suitable to be applied in UAV.

TELKOMNIKA (Telecommunication Computing Electronics and Control), 2014

Non-planar structures have been identified as promising structure for next device generation in t... more Non-planar structures have been identified as promising structure for next device generation in the nanoelectronic era. However, the continuous device dimension scaling into nano regime eventually requires more sophisticated model due to the limitation of the existing models. A model for non-planar MOSFET structure was elaborated in this paper, especially for device with pillar structure, using analytical approach. The concern of channel shape and structure were discussed as well. The result shows the shift in subthreshold characteristic in the channel with recessed channel model. The charge sharing is suspected as one of the key parameter in the shift of performance in the recessed region.

2014 IEEE Asia-Pacific Conference on Applied Electromagnetics (APACE), 2014

ABSTRACT This paper presents a central base station (CBS) for radio over fiber (RoF) downlink sys... more ABSTRACT This paper presents a central base station (CBS) for radio over fiber (RoF) downlink system at 2.4 GHz. CBS is designed to replace the function of switching room in complex signal processing, which offers conversion and distribution at low cost, simple, and efficient system. The received optical signal at CBS from internet service provider (ISP) propagates through fiber cable to radio frequency (RF) photonic link and finally is received by users. The analyses of simulated and measured results are carried out. This system is operating at wireless local area network 802.11b/g standard at 2.4 GHz band with maximum data rate of 54 Mbps.

2012 IEEE Asia-Pacific Conference on Applied Electromagnetics (APACE), 2012

2011 IEEE International RF & Microwave Conference, 2011

A microstrip-fed broadband printed monopole antenna covering 1.7-6.0 GHz is miniaturized using ha... more A microstrip-fed broadband printed monopole antenna covering 1.7-6.0 GHz is miniaturized using half-cut technique, and arranged in pair for uplink/downlink microwavephotonic access point. This paper discusses the effect of the miniaturization to S11 and radiation pattern of individual antenna, and also the best choice of antenna pair, ground-plane type, and total width of the access point.

2010 IEEE Asia-Pacific Conference on Applied Electromagnetics (APACE), 2010

This paper presents a wideband photonic antenna consisting the laser diode, matching circuit, RF ... more This paper presents a wideband photonic antenna consisting the laser diode, matching circuit, RF amplifier and microstrip patch antenna are fabricated and connected together to perform in uplink system. Laser driver is used to supply the dc biasing for the laser. Lastly, the LD-matching circuit, RF amplifier and antenna were arrange together and connected to perform the wireless uplink system.

International Conference On Photonics 2010, 2010

This paper presents an active photonic antenna concept whereby an interface circuit is introduced... more This paper presents an active photonic antenna concept whereby an interface circuit is introduced in order to integrate the antenna with the photodiode. The operating frequencies ranges are 1.8 to 3.5 GHz which support the GSM 1800, WLAN and WiMAX applications. The simulated and measured results of interface circuit and antenna are presented. Thus, the photonic antenna is developed by integrating photodiode, interface circuit, RF amplifier and printed antenna and fabricated on FR4 board. The experiment was setup and spectrums at desired frequencies were measured. Measurement results show that an active downlink photonic antenna (ADPha) is successfully developed.

2012 IEEE 3rd International Conference on Photonics, 2012

ABSTRACT This paper proposes a backup system for optical backhaul using Wireless Local Area Netwo... more ABSTRACT This paper proposes a backup system for optical backhaul using Wireless Local Area Network (WLAN) 802.11n with Multiple-Input Multiple Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) techniques. This backup system is needed in order to make sure the communication networks can still work when the optical network breakdown occurred. The system is simulated and analysed using OptiSystem software. The simulation results show that the backup system can operate up to 300 Mbps.

ICT 2013, 2013

ABSTRACT The introduction of new wireless access technologies in the crowded spectrum requires wi... more ABSTRACT The introduction of new wireless access technologies in the crowded spectrum requires wireless infrastructures and user equipments to provide multiband and multiservice capabilities. One approach to cope with this challenge is to design a broadband microwave-photonic access-point that covers all required bands. This paper investigates isolation enhancement of miniaturized antenna-pair used in the broadband system. Among available isolation enhancement techniques, defected-ground (or ground-slot) and ground-stub are chosen due to their wideband feature. The simulations and measurements conducted to printed monopole antenna pairs show that the chosen techniques are effective in improving isolation between uplink and downlink antenna pair.

Microwave and Optical Technology Letters, 2011

This paper proposes a representation of antenna in two-port network s-parameter, by exploiting th... more This paper proposes a representation of antenna in two-port network s-parameter, by exploiting the analogy between the antenna and a two port network, to produce a suitable method for evaluating antennas in system and circuit simulation. Complicated steps required by previous methods to determine an antenna-specific equivalent-circuit and its corresponding resistor, inductor, and capacitor values are avoided. Simulations results obtained for the circuit and system software confirms the validity of the proposed scheme.

Wireless access network is a very popular and famous technology in today's communication world. W... more Wireless access network is a very popular and famous technology in today's communication world. Wireless access, either fixed or mobile is regarded as an excellent way to achieve good broadband services. The future generation of cellular networks will need much smaller cells than present generation networks and Radio over Fiber (RoF) technology and photonic antenna are introduced for this application. However, photonic antennas proposed in some publications generally are intended for short range communication. This chapter presents design and simulation of photonic antenna for longer range application. The antenna is designed for 5.8 GHz, as the operating frequency is commonly used for long range, WLAN backhaul network. Overview on RoF technology and photonic antenna are also presented in this chapter.

Page 1. WIRELESS LOCAL AREA NETWORK BRIDGING USING RADIO OVER FIBER TECHNOLOGY NURUL HUDA BINTI I... more Page 1. WIRELESS LOCAL AREA NETWORK BRIDGING USING RADIO OVER FIBER TECHNOLOGY NURUL HUDA BINTI ISMAIL UNIVERSITI TEKNOLOGI MALAYSIA Page 2. Page 3. Page 4. WIRELESS LOCAL AREA NETWORK BRIDGING USING RADIO OVER ...

... FREE SPACE OPTIC COMMUNICATION LINK NADIA BINTI MOHAMED NAWAWI UNIVERSITI TEKNOLOGI MALAYSIA ... more ... FREE SPACE OPTIC COMMUNICATION LINK NADIA BINTI MOHAMED NAWAWI UNIVERSITI TEKNOLOGI MALAYSIA Page 2. PSZ 19:16 (Pind. ... FREE SPACE OPTIC COMMUNICATION LINK NADIA BINTI MOHAMED NAWAWI A thesis submitted in partial fulfilment of the ...

ITB Journal of Information and Communication Technology, 2008

Future communication needs to be ubiquitous, broadband, convergent, and seamless. Radio over fibe... more Future communication needs to be ubiquitous, broadband, convergent, and seamless. Radio over fiber (RoF) technology is one of the most important enabler in access network for the technologies. Adoption of RoF faces bottleneck in optoelectronics, that they are still expensive, high power consumption, and limited in bandwidth. To solve the problem, transceiver in remote antenna unit (RAU) is developed, i.e. electroabsorption transceiver (EAT) and asymmetric Fabry-Perot modulator (AFPM). This paper compares their coverage range and cost in providing WCDMA and WLAN services. Needed gain of RF amplifier for supporting picocell is also discussed.

Proceeding of the Electrical Engineering Computer Science and Informatics

This paper presents a compact and broadband MIMO antenna intended for wireless access network at ... more This paper presents a compact and broadband MIMO antenna intended for wireless access network at 1.7-6.0 GHz. Impedance degradation introduced by half-cut technique is solved by inserting microstrip-line transformer.

Ultra high-speed optical network is developing rapidly as growing capacity demand in telecommunic... more Ultra high-speed optical network is developing rapidly as growing capacity demand in telecommunication system is increasing. In these networks, it is desired to carry out switching, routing and processing in optical domain to avoid bottlenecks of optoelectronic conversions. Optical time-division multiplexing (OTDM) technique is one option to implement all optical networks. It provides a single data stream at a very high rate (>100 Gbits/s) using a single wavelength. These networks will be based on optical packet switching. The success of these networks depends on how well switching and routing are being done at this very high speed. An all optical switch based on symmetric Mach-Zehnder (SMZ) with asymmetric coupler (60:40) is proposed. Its characteristics and switching window profiles will be investigated. The results show that symmetric Mach-Zehnder (SMZ) with asymmetric coupler gives a better contrast ratio rather than symmetric Mach-Zehnder (SMZ) with normal 50:50 coupler.

Journal of Physics: Conference Series, 2020

Signal always occurs with noise. Since noise acts as an unwanted signal, we must clear or reduce ... more Signal always occurs with noise. Since noise acts as an unwanted signal, we must clear or reduce it with some denoising method. It is relatively easy to denoise the normal distribution noise-contaminated the periodic signal. The problem ascends if a non-Gaussian noise intrudes into a non-periodic signal. The standard filter, such as DWT (discrete wavelet transforms), cannot overcome this directly and blindly. In this research, we proposed ANFIS (Adaptive Neuro-Fuzzy Inference System) as a non-periodic noisy signal denoising method. Foremost, the ANFIS trained to mimic or estimate the interfered noise, then this noise estimation used as a subtractive signal in a non-periodic noisy signal. As a result, the ANFIS can reduce the non-Gaussian noise in the various noisy non-periodic signals with minimum error better than standard DWT (Discrete Wavelet Transform).

IOP Conference Series: Materials Science and Engineering, 2017

Common weight scales cannot assess body composition or determine fat mass and fat-fress mass that... more Common weight scales cannot assess body composition or determine fat mass and fat-fress mass that make up the body weight. This research propose bio-impedance analysis (BIA) tool capable to body composition assessment. This tool uses four electrodes, two of which are used for 50 kHz sine wave current flow to the body and the rest are used to measure the voltage produced by the body for impedance analysis. Parameters such as height, weight, age, and gender are provided individually. These parameters together with impedance measurements are then in the process to produce a body fat percentage. The experimental result shows impressive repeatability for successive measurements (stdev ≤ 0.25% fat mass). Moreover, result on the hand to hand node scheme reveals average absolute difference of total subjects between two analyzer tools of 0.48% (fat mass) with maximum absolute discrepancy of 1.22% (fat mass). On the other hand, the relative error normalized to Omron's HBF-306 as comparison tool reveals less than 2% relative error. As a result, the system performance offers good evaluation tool for fat mass in the body.

IOP Conference Series: Materials Science and Engineering, 2017

Skew-planar antenna is suitable for unmanned aerial vehicles (UAVs) since it has circular polariz... more Skew-planar antenna is suitable for unmanned aerial vehicles (UAVs) since it has circular polarization (avoiding polarization-mismatched), omnidirectional radiation pattern (low pointing loss) thus comply with maneuver angles of UAV, and also small size. Investigation with electromagnetic simulations shows that tilt angle and coaxial length are the most sensitive parameters. Modified design with 55° tilt angle (original design: 45°) and 100 mm coaxial length (original: 60 mm) potentially provides wider bandwidth (400 MHz vs. 290 MHz), better impedance-matched (|S |:-47.1 dB vs.-13.6 dB), and better gain (1.98 dBi vs 1.61 dBi). The antenna is predicted capable to support service distance of 3 km in 2.4 GHz band if used with communication module with 18 dBm transmit power and-100 dBm receiver sensitivity. Therefore, the modified antenna is suitable to be applied in UAV.

TELKOMNIKA (Telecommunication Computing Electronics and Control), 2014

Non-planar structures have been identified as promising structure for next device generation in t... more Non-planar structures have been identified as promising structure for next device generation in the nanoelectronic era. However, the continuous device dimension scaling into nano regime eventually requires more sophisticated model due to the limitation of the existing models. A model for non-planar MOSFET structure was elaborated in this paper, especially for device with pillar structure, using analytical approach. The concern of channel shape and structure were discussed as well. The result shows the shift in subthreshold characteristic in the channel with recessed channel model. The charge sharing is suspected as one of the key parameter in the shift of performance in the recessed region.

2014 IEEE Asia-Pacific Conference on Applied Electromagnetics (APACE), 2014

ABSTRACT This paper presents a central base station (CBS) for radio over fiber (RoF) downlink sys... more ABSTRACT This paper presents a central base station (CBS) for radio over fiber (RoF) downlink system at 2.4 GHz. CBS is designed to replace the function of switching room in complex signal processing, which offers conversion and distribution at low cost, simple, and efficient system. The received optical signal at CBS from internet service provider (ISP) propagates through fiber cable to radio frequency (RF) photonic link and finally is received by users. The analyses of simulated and measured results are carried out. This system is operating at wireless local area network 802.11b/g standard at 2.4 GHz band with maximum data rate of 54 Mbps.

2012 IEEE Asia-Pacific Conference on Applied Electromagnetics (APACE), 2012

2011 IEEE International RF & Microwave Conference, 2011

A microstrip-fed broadband printed monopole antenna covering 1.7-6.0 GHz is miniaturized using ha... more A microstrip-fed broadband printed monopole antenna covering 1.7-6.0 GHz is miniaturized using half-cut technique, and arranged in pair for uplink/downlink microwavephotonic access point. This paper discusses the effect of the miniaturization to S11 and radiation pattern of individual antenna, and also the best choice of antenna pair, ground-plane type, and total width of the access point.

2010 IEEE Asia-Pacific Conference on Applied Electromagnetics (APACE), 2010

This paper presents a wideband photonic antenna consisting the laser diode, matching circuit, RF ... more This paper presents a wideband photonic antenna consisting the laser diode, matching circuit, RF amplifier and microstrip patch antenna are fabricated and connected together to perform in uplink system. Laser driver is used to supply the dc biasing for the laser. Lastly, the LD-matching circuit, RF amplifier and antenna were arrange together and connected to perform the wireless uplink system.

International Conference On Photonics 2010, 2010

This paper presents an active photonic antenna concept whereby an interface circuit is introduced... more This paper presents an active photonic antenna concept whereby an interface circuit is introduced in order to integrate the antenna with the photodiode. The operating frequencies ranges are 1.8 to 3.5 GHz which support the GSM 1800, WLAN and WiMAX applications. The simulated and measured results of interface circuit and antenna are presented. Thus, the photonic antenna is developed by integrating photodiode, interface circuit, RF amplifier and printed antenna and fabricated on FR4 board. The experiment was setup and spectrums at desired frequencies were measured. Measurement results show that an active downlink photonic antenna (ADPha) is successfully developed.

2012 IEEE 3rd International Conference on Photonics, 2012

ABSTRACT This paper proposes a backup system for optical backhaul using Wireless Local Area Netwo... more ABSTRACT This paper proposes a backup system for optical backhaul using Wireless Local Area Network (WLAN) 802.11n with Multiple-Input Multiple Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) techniques. This backup system is needed in order to make sure the communication networks can still work when the optical network breakdown occurred. The system is simulated and analysed using OptiSystem software. The simulation results show that the backup system can operate up to 300 Mbps.

ICT 2013, 2013

ABSTRACT The introduction of new wireless access technologies in the crowded spectrum requires wi... more ABSTRACT The introduction of new wireless access technologies in the crowded spectrum requires wireless infrastructures and user equipments to provide multiband and multiservice capabilities. One approach to cope with this challenge is to design a broadband microwave-photonic access-point that covers all required bands. This paper investigates isolation enhancement of miniaturized antenna-pair used in the broadband system. Among available isolation enhancement techniques, defected-ground (or ground-slot) and ground-stub are chosen due to their wideband feature. The simulations and measurements conducted to printed monopole antenna pairs show that the chosen techniques are effective in improving isolation between uplink and downlink antenna pair.

Microwave and Optical Technology Letters, 2011

This paper proposes a representation of antenna in two-port network s-parameter, by exploiting th... more This paper proposes a representation of antenna in two-port network s-parameter, by exploiting the analogy between the antenna and a two port network, to produce a suitable method for evaluating antennas in system and circuit simulation. Complicated steps required by previous methods to determine an antenna-specific equivalent-circuit and its corresponding resistor, inductor, and capacitor values are avoided. Simulations results obtained for the circuit and system software confirms the validity of the proposed scheme.

Wireless access network is a very popular and famous technology in today's communication world. W... more Wireless access network is a very popular and famous technology in today's communication world. Wireless access, either fixed or mobile is regarded as an excellent way to achieve good broadband services. The future generation of cellular networks will need much smaller cells than present generation networks and Radio over Fiber (RoF) technology and photonic antenna are introduced for this application. However, photonic antennas proposed in some publications generally are intended for short range communication. This chapter presents design and simulation of photonic antenna for longer range application. The antenna is designed for 5.8 GHz, as the operating frequency is commonly used for long range, WLAN backhaul network. Overview on RoF technology and photonic antenna are also presented in this chapter.

Page 1. WIRELESS LOCAL AREA NETWORK BRIDGING USING RADIO OVER FIBER TECHNOLOGY NURUL HUDA BINTI I... more Page 1. WIRELESS LOCAL AREA NETWORK BRIDGING USING RADIO OVER FIBER TECHNOLOGY NURUL HUDA BINTI ISMAIL UNIVERSITI TEKNOLOGI MALAYSIA Page 2. Page 3. Page 4. WIRELESS LOCAL AREA NETWORK BRIDGING USING RADIO OVER ...

... FREE SPACE OPTIC COMMUNICATION LINK NADIA BINTI MOHAMED NAWAWI UNIVERSITI TEKNOLOGI MALAYSIA ... more ... FREE SPACE OPTIC COMMUNICATION LINK NADIA BINTI MOHAMED NAWAWI UNIVERSITI TEKNOLOGI MALAYSIA Page 2. PSZ 19:16 (Pind. ... FREE SPACE OPTIC COMMUNICATION LINK NADIA BINTI MOHAMED NAWAWI A thesis submitted in partial fulfilment of the ...

ITB Journal of Information and Communication Technology, 2008

Future communication needs to be ubiquitous, broadband, convergent, and seamless. Radio over fibe... more Future communication needs to be ubiquitous, broadband, convergent, and seamless. Radio over fiber (RoF) technology is one of the most important enabler in access network for the technologies. Adoption of RoF faces bottleneck in optoelectronics, that they are still expensive, high power consumption, and limited in bandwidth. To solve the problem, transceiver in remote antenna unit (RAU) is developed, i.e. electroabsorption transceiver (EAT) and asymmetric Fabry-Perot modulator (AFPM). This paper compares their coverage range and cost in providing WCDMA and WLAN services. Needed gain of RF amplifier for supporting picocell is also discussed.

Proceeding of the Electrical Engineering Computer Science and Informatics

This paper presents a compact and broadband MIMO antenna intended for wireless access network at ... more This paper presents a compact and broadband MIMO antenna intended for wireless access network at 1.7-6.0 GHz. Impedance degradation introduced by half-cut technique is solved by inserting microstrip-line transformer.

Ultra high-speed optical network is developing rapidly as growing capacity demand in telecommunic... more Ultra high-speed optical network is developing rapidly as growing capacity demand in telecommunication system is increasing. In these networks, it is desired to carry out switching, routing and processing in optical domain to avoid bottlenecks of optoelectronic conversions. Optical time-division multiplexing (OTDM) technique is one option to implement all optical networks. It provides a single data stream at a very high rate (>100 Gbits/s) using a single wavelength. These networks will be based on optical packet switching. The success of these networks depends on how well switching and routing are being done at this very high speed. An all optical switch based on symmetric Mach-Zehnder (SMZ) with asymmetric coupler (60:40) is proposed. Its characteristics and switching window profiles will be investigated. The results show that symmetric Mach-Zehnder (SMZ) with asymmetric coupler gives a better contrast ratio rather than symmetric Mach-Zehnder (SMZ) with normal 50:50 coupler.