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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)

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

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)

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

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

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

REDUKSI PEAK-TO-AVERAGE POWER RATIO PADA SINYAL OFDM MENGGUNAKAN SKEMA HYBRID ENHANCED PARTIAL TRANSMIT SEQUENCE-TONE RESERVATION Aries Pratiarso; Dita Vernanda; Yoedy Moegiharto; Hendy Briantoro
SENTIA 2016 Vol 8, No 2 (2016)
Publisher : SENTIA 2016

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Orthogonal Frequency Division Multiplexing (OFDM) memiliki kelemahan yaitu nilai Peak To Average Poser Ratio (PAPR) yang tinggi yang dapat meningkatkan kompleksitas Analog to Digital Converter (ADC) maupun Digital to Analog Converter (DAC) serta mengurangi efisiensi dari power amplifier. Dalam penelitian ini digunakan teknik hybrid Partial Transmit Sequence (PTS) Tone Reservation (TR) untuk mereduksi PAPR yang tinggi trsebut. Pada teknik Partial Transmit Sequence, data sekuen dalam ranah frekuensi dibagi ke dalam beberapa subblok yang saling terpisah (disjoint subblok) menggunakan Interleave Partitioning (IP), kemudian dikalikan dengan factor fase untuk membuat bakal sinyal yang akan dikirimkan. Teknik clipping – filtering membangkitkan peak canceling signal yang digunakan sebagai reserved tone untuk ditambahkan pada data tone ketika melalui proses tone reservation. Hasil simulasi menunjukkan bahwa teknik Hybrid PTS – TR mampu mereduksi nilai PAPR yang tinggi. Hasil kinerja sistem dibuktikan dengan menggunkan kurva Complementary Cumulative Distribution Function (CCDF).

TEKNIK REDUKSI PEAK-TO AVERAGE POWER RATIO SINYAL OFDM MENGGUNAKAN SKEMA HYBRID ENHANCED PARTIAL TRANSMIT SEQUENCE DAN ADAPTIVE ITERATIVE CLIPPING FILTER Anang Budikarso; Hendy Briantoro; Nur Rahmaniah
SENTIA 2016 Vol 8, No 2 (2016)
Publisher : SENTIA 2016

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Dalam makalah ini dilakukan simulai kinerja teknik reduksi PAPR dengan skema hybrid enhanced Partial Transit Sequence (PTS) dan Adaptive Iterative Clipping Filtering (AICF). Skema enhanced PTS bertujuan menaikkan kandidat sinyal OFDM, yang ikut menaikkan kinerja PAPR. Skema hybrid PTS-AICF memberikan hasil kinerja yang lebih baik bila dibandingkan dengan teknik enhanced PTS dan skema hybrid enhanced PTS-ICF (IterativeClipping Filtering). Simulasi dilakukan dengan mengubah parameter jumlah factor phasa, W = 2 dan 4 pada teknik PTS dan nilai clipping ratio (CR) = 2 dB dan 6 dB pada teknik clipping-filtering.

PTS and AICF Combined PAPR Reduction Techniques in Multi-Antenna OFDM Systems Arifin Arifin; Silvi Fitriah Ditasari; Yoedy Moegiharto; Ida Anisah; Hendy Briantoro
IJITEE (International Journal of Information Technology and Electrical Engineering) Vol 2, No 4 (2018): December 2018
Publisher : Department of Electrical Engineering and Information Technology,Faculty of Engineering UGM

A high PAPR value is one of important weaknesses in OFDM systems. Several reduction techniques are applied to reduce PAPR including partial transmit sequence (PTS) as well as clipping and filtering (CF). Adaptive iterative clipping and filtering is a development of iterative clipping and filtering techniques. In this paper, a combination of Partial transmits sequence and adaptive iterative clipping filtering (PTS-AICF) techniques on multi-antenna OFDM transmitters was carried out. The simulation results showed that combined technique application had a better performance than non-combined technique (PTS), either for two or four antennas, and also for different sub block numbers. Performance was also influenced by iterations number on AICF section, the more iterations were used, the better the reduction technique performance was because it produced smaller PAPR 0 value.

Operasi Ekonomis Motor Pompa Air pada Water Treatment Plant menggunakan Metode Iterasi Lambda Ciptian Weried Priananda; Ferian Bagus Kusuma; Tegar Esa Herlambang; Fivitria Istiqomah; Hendy Briantoro; Arif Musthofa
Voteteknika (Vocational Teknik Elektronika dan Informatika) Vol 10, No 4 (2022): Vol. 10, No 4, Desember 2022
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/voteteknika.v10i4.119539

Water Treatment Plant (WTP) sebagai unit pengolahan air memiliki dua buah motor pompa air dengan kapasitas daya listrik yang berbeda pada dua sumur dengan kapasitas yang berbeda pula. Selama ini operasi kedua motor pompa masih menggunakan penjadwalan manual yang berpotensi tidak hemat energi listrik. Hal ini menjadi peluang dalam pengembangan metode pengoperasian ekonomis motor pompa air agar konsumsi energi listrik dapat diturunkan guna mendukung program kerja perusahaan. Penelitian ini memberikan pendekatan operasi ekonomis dengan menggunakan metode Iterasi Lambda yang umum digunakan pada sistem tenaga listrik untuk mencapai operasi ekonomis pada motor pompa air. Iterasi Lambda bekerja dengan mempertahankan kapasitas WTP dengan batasan (constraint) minimum sebesar 25.452 liter dan maksimum sebesar 112.000 liter dari kapasitas tanki WTP. Penggunaan metode Iterasi mencapai konvergensi pada iterasi ke-11, dengan hasil perhitungan motor pompa air pertama sebesar 59.000 liter serta motor pompa air kedua sebesar 53.000 liter dengan biaya total (objective function) setiap satu kali siklus pengisian air Rp 6.214,- lebih hemat 34% dibandingkan dengan metode penjadwalan manual sebelumnya.Kata kunci : Iterasi Lambda, Motor Pompa Air, Penghematan Energi Listrik, Operasi Ekonomis. The Water Treatment Plant (WTP) as a water treatment unit has two water pump motors with different electrical power capacities in two wells with different capacities. So far, the operation of both pump motors is still using manual scheduling which has potentially not energi efficient. This is an opportunity to develop an economical operating method for the water pump motor so that the consumption of electrical energy can be reduced to support the company's work program. This study provides an economical operation approach using the Lambda Iteration method which is commonly used in electric power systems to achieve economical operation on water pump motors. Lambda iteration works by maintaining WTP capacity with a minimum constraint of 25,452 liters and a maximum of 112,000 liters of WTP tank capacity. The use of the Iteration method achieves convergence in the 11th iteration, with the the first water pump motor provide 59,000 liters and the second water pump motor provide 53,000 liters with a total cost (objective function) for each water filling cycle of Rp. 6,214, - , approximatelly 34% more efficient compared to the previous manual scheduling method.Keywords: Lambda Iteration, Water Pump Motor, Electric Energy Saving, Economical Operation

Penerapan Teknologi IoT pada Sistem Monitoring Tekanan Ban Mobil yang Berjalan Hendy Briantoro
Jurnal Inovtek Polbeng Seri Informatika Vol 7, No 2 (2022)
Publisher : P3M Politeknik Negeri Bengkalis

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35314/isi.v7i2.2730

There are many vehicle accidents on the road, around 18-23% are caused by tire burst. One solution is to monitor the car tire pressure. In this study, we created a car tire pressure monitoring system that runs using IoT technology. This system successfully monitors tire pressure changes remotely.

Performance Analysis Of The Energy Harvesting Techniques In Cooperative Communication Systems of NBIoT Devices With Amplify And Forward (AF) Relaying Protocol Ines Sastre Umayya; Muhamad Milchan; Hendy Briantoro; Yoedy Moegiharto
Elinvo (Electronics, Informatics, and Vocational Education) Vol 7, No 2 (2022): November 2022
Publisher : Department of Electronic and Informatic Engineering Education, Faculty of Engineering, UNY

This study examines the system’s performance with implementation of the energy harvesting (EH) techniques at source node, S and relay node, R. The RF signals which are used to energy harvesting proccess are broadcasted by destination node, D. The information signals from S are sent to D via a R in a cooperative communication framework. The R uses the amplify and forward (AF) protocol to forward the received signal from S to D. We propose a network system which contain of three femto cells, and an access point of each femto cells work as a relay (R), in a macro cell with a base station or eNB as a destination (D). To find the best R for forwarding the information signal from S to D, we choose the partial relai selection strategy. From the simulation results can be shown that the throughput system and the outage probability system are affected by the location of S or the distance of between S-R and S-D. Also affected by the access point power of femto cell that is connected to electric source, and time swithing factor, ρ which is used to harvest energy at S and R nodes. The shorter distance of between S-R and S-D results a better value of throughput system and the outage probability system, since the gain channel value will be high and increases the SNR value at D. More bigger the power from battery of access point femto cell that is used together with the harvested power by R to forward the signal will result a better value of throughput system and the outage probability system. More smaller time swithing factor, ρ results more time period for transmitting signal by S and forwarding sinyal by R, therefore increases the transmit power at S and R. Increasing the transmit powers result the increasin SNR value at D, and result a better value of throughput system and the outage probability system.

The Joint Channel Coding and Pre-Distortion Technique on the USRP-Based MIMO-OFDM System Melki Mario Gulo; I Gede Puja Astawa; Arifin; Yoedy Moegiharto; Hendy Briantoro
Jurnal RESTI (Rekayasa Sistem dan Teknologi Informasi) Vol 7 No 4 (2023): August 2023
Publisher : Ikatan Ahli Informatika Indonesia (IAII)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29207/resti.v7i4.5093

Modern wireless communication systems use orthogonal frequency division multiplexing (OFDM), a multi-carrier modulation method that resists multipath channels and provides bandwidth efficiency. OFDM is generally used with a Multiple-Input Multiple-Output (MIMO) system to boost diversity gain and channel capacity. MIMO-OFDM has several advantages, but its high PAPR value is a drawback. A non-linear high-power amplifier (HPA) can distort signals with high PAPR values. This issue can be resolved by employing predistortion, which compensates for nonlinear HPA. In addition to PD, channel coding can be used to improve the quality of systems with high PAPR values by adding redundant bits to the bits to be sent. In this paper, we report the experimental evaluations of the joint channel coding and pre-distortion (PD) technique on a 2x2 MIMO OFDM system using USRP hardware. The experiments are conducted in two scenarios: line-of-sight (LOS) and nonline-of-sight (NLOS) scenarios. The channel coding used in this scenario is convolutional code with code rates of 1/2, 2/3, and 3/4. From the results of the experiment, it can be seen that the system that uses PD combined with the convolution code produces better performance in the LOS and NLOS scenarios compared to the system without PD. In the LOS scenario, the use of PD can improve the SNR value of code rates 1/2, 2/3, and 3/4 by approximately 58.74%, 75.97%, and 96.20%. In the NLOS scenario, the use of PD can improve the SNR value of code rates 1/2, 2/3, and 3/4 by about 60.71%, 73.59%, and 71.84%. The measurement of the LOS scenario gives a better SNR value than the NLOS scenario, with a maximum SNR value of 30.86 dB, while the maximum SNR value of the NLOS scenario is 30.23 dB. This happened because the LOS scenario suffered minimal multipath fading compared to the NLOS scenario

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