Article Per Year (5 Year)
p-Index From 2020 - 2025
0
P-Index
This Author published in this journals
All Journal Jurnal Ilmiah Dinamika Rekayasa (DINAREK)
Widhiatmoko Hery Purnomo
Prodi Teknik Elektro Universitas Jenderal Soedirman
Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering

Published : 4 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 4 Documents
Search

 1 
Analisis Pengaruh Rx Level Terhadap Kecepatan Download Data Pada Teknologi GPRS di PT XL Axiata Tbk. Purwokerto Aldina Peto Bravi; Azis Wisnu Widhi Nugraha; Widhiatmoko Hery Purnomo
Dinamika Rekayasa Vol 7, No 1 (2011): Dinamika Rekayasa - Februari 2011
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dr.2011.7.1.40

Abstract

Data transfer speed on GPRS’s technology isaffected by the present of some obstacles between sender’s side and recipient’s side. Those obstacles cause propagation loss that affect the reduction of power level value (rx level). The reduction will affect the data speed. The lower rx level’s value means the lower dataspeed. This researchwas done by doing drive test on BTS North Purwokerto and BTS Tambaksogra to measure the amount of power measured (Pr) andthe download data speed on GPRS’s network. The measuredpower level (Pr) was normalized to get rx level value. Regression analysis was done to get the relation between the download speed and the rx level value. Theanalysis has resulted in a model: download speed = 4.1 (rx level) 0.459 , with R^2 = 0.380. Correlation analysis shows high correlationbetween rx level and download speed (r = 0.608).
Estimasi Kinerja Kanal MIMO-OFDM Menggunakan Modulasi Adaptif Untuk Teknologi LTE Berdasar Pada Kecepatan Pelanggan Widhiatmoko Hery Purnomo; Hesti Susilawati; Ari Fadli
Dinamika Rekayasa Vol 11, No 1 (2015): Jurnal Ilmiah Dinamika Rekayasa - Februari 2015
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dr.2015.11.1.89

Abstract

OFDM dipakai untuk teknik multiple accesspada downlink LTE. Dalam teknologi LTE, parameter kecepatan user sangat berpengaruh terhadap kualitas jaringan.Pada OFDM, estimasikanalsangatdiperlukan untuk mengatasi fading dan noise.Semakin besar kecepatan user maka semakin besar nilai fading dan noise.Untuk mengatasi masalah tersebut diperlukan estimasi kanal yang digunakan. Metode estimasi kanal yang banyak digunakan ada dua yaitu metode Least Square (LS) dan metode Minimum Mean Square Error (MMSE). Kedua metode tersebut digunakan pada penerima diam dan penerima bergerak dengan modulasi QPSK, 16-QAM, dan 64-QAM. Simulasi dilakukan untuk mengetahui metode estimasi kanal pada beberapa variasi kecepatan user. Hasil analisa menunjukkan bahwa estimasi kanal dengan metode MMSE lebih baik dibandingkan metode LS. Sedangkan pada penerima dengan kecepatan rendah memiliki kualitas jaringan yang lebih baik dibandingkan pada penerima dengan kecepatan tinggi.
Analisis Pengaruh Down Tilt Antena Untuk Mengurangi Kegagalanhandover Pada Jaringan Seluler GSM PT. Indosat, Tbk. Purwokerto Wahyu Dewantara; Azis Wisnu Widhi Nugraha; Widhiatmoko Hery Purnomo
Dinamika Rekayasa Vol 6, No 2 (2010): Dinamika Rekayasa - Agustus 2010
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dr.2010.6.2.36

Abstract

Handover is a process to guarantee the MS (Mobile Station) communication connection while moving for one cell to another cell. There are 10,89%-12,04% handover failure occurred between BTS Cilongok sector 1 and BTS Karanglewas sector 3 of PT. Indosat, Tbk,Purwokerto, whereas, thestandard is 2%-3%. Based on KPI (Key Performance Indicator) data most of handover failure is caused by long overlapping coverage (1,2851 km) as could be seen in BSC Controlled Inc. HO Fail at the amount of 9,69%-10,24%. Long overlapping coverage also reduce Rx Level signal quality to-94 dBm (threshold-90 dBm), and Rx Qual is 2,26 (it is still good enough if comparing to the threshold 5). Down tilt antenna method is used to overcome the overlapping coverage. Calculation result of down tilt antenna points out that the precise down tilt antenna to be applied in BTS Cilongok sector 1 is 3º and BTS Karanglewas sector 3 is 2,5º with number of overlapping coverage 78,2 m (appropriate to reference of PT. Indosat, Tbk Purwokerto�100 m). After down tilting antenna indicates that there is a reduction of handover failure because of overlapping coverage reduce to 0,01%- 0,02%, and total handover failure reduce to 0,62%- 1,39% . Meanwhile there is a raising in signal quality,it is Rx Level become-75 dBm and thebetter size of Rx Qual is 1.
Jumlah Transisi pada Ciri Transisi dalam Pengenalan Pola Tulisan Tangan Aksara Jawa Nglegeno dengan Multiclass Support Vector Machines Azis Wisnu Widhi Nugraha; Widhiatmoko Hery Purnomo
Dinamika Rekayasa Vol 8, No 1 (2012): Dinamika Rekayasa - Februari 2012
Publisher : Jenderal Soedirman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.dr.2012.8.1.55

Abstract

Feature extraction is one of the most improtant step on characters recognition system. Transition features is one from many features used on characters recognition system. This paper report a research on handwritten basic Jawanesse characters recognition system to found the proper numbers of transitions used on transition features. To recognize the characters,the Multiclass Support Vector Machines were used. The Directed Acyclic Graph (DAG) SVM were used for multiclass classification strategy and to map each input vector to a higher dimention space, the Gaussian Radial Basis Function (RBF) kernel with parameter 1were used. It can be shown, for basicJawanesse characters recognition system, the optimal numbers of transitions used for transition features is 4 (a half of maximum numbers of transition on all patterns).
Co-Authors Aldina Peto Bravi Ari Fadli Azis Wisnu Widhi Nugraha Hesti Susilawati Wahyu Dewantara