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All Journal Jurnal Teknik ITS TELKOMNIKA (Telecommunication Computing Electronics and Control)
Wirawan Wirawan
Institut Teknologi Sepuluh Nopember Surabaya
Computer Science & IT Engineering

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An Adaptive Modulation in Millimeter-Wave Communication System for Tropical Region Suwadi Suwadi; Gamantyo Hendrantoro; Wirawan Wirawan
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 8, No 3: December 2010
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v8i3.634

Abstract

 The dominant propagation factor affecting the outage and the spectral efficiency of millimeter-wave communication systems operating at frequencies 30 GHz is rain attenuation. An adaptive modulation is proposed to improve the outage and spectral efficiency performance of the system. This paper presents an analytical procedure for the evaluation of the outage and spectral efficiency of the system in Indonesia with heavy rain rate. By comparing analytic and simulation a validation was conducted. The results show that adaptive modulation can significantly improve the outage and the spectral efficiency performance of the system, for links with long distance.
Gabor-based Face Recognition with Illumination Variation using Subspace-Linear Discriminant Analysis Hendra Kusuma; Wirawan Wirawan; Adi Soeprijanto
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 10, No 1: March 2012
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v10i1.767

Abstract

            Face recognition has been an active research topic in the past few decades due to its potential applications. Accurate face recognition is still a difficult task, especially in the case that illumination is unconstrained. This paper presents an efficient method for the recognition of faces with different illumination by using Gabor features, which are extracted by using log-Gabor filters of six orientations and four scales. By Using sliding window algorithm, these features are extracted at image block-regions. Extracted features are passed to the principal component analysis (PCA) and then to linear discriminant analysis (LDA). For development and testing we used facial images from the Yale-B databases. The proposed method achieved 86–100 % rank 1 recognition rate.
Spectrum Handoff pada Teknologi Dynamic Spectrum Access and Sharing untuk Radio Kognitif Muhammad Nur Rahman; Suwadi suwadi; Wirawan Wirawan
Jurnal Teknik ITS Vol 1, No 1 (2012)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (592.998 KB) | DOI: 10.12962/j23373539.v1i1.102

Abstract

Salah satu teknik dalam dynamic spectrum access and sharing yang diimplementasikan pada sistem radio kognitif adalah spektrum handoff. Spektrum handoff merupakan salah satu dari tiga bagian penting dalam teknologi radio kognitif selain spektrum sensing dan spektrum management. Spektrum handoff biasa juga disebut spektrum mobility yang menunjukkan bahwa penggunaan spektrum untuk melakukan transmisi dalam teknologi radio kognitif dapat berpindah-pindah. metode spektrum handoff dapat dibagimenjadi dua macam, yaitu metode spektrum handoff proaktif dan reaktif. Dimana proaktif berarti kanal yang akan ditempati berikutnya telah di-reserve terlebih dahulu dan reaktif berarti kanal dicari ketika dibutuhkan. Model yang digunakan adalah sistem antrian preemptive resume priority M/G/1. Dengan melakukan variasi pada nilai trafik pengguna didapat penggunaan spektrum handoff dapat mengurangi delay pengguna sekunder hingga50% bergantung dari trafik pengguna primer.
Co-Authors Adi Soeprijanto Gamantyo Hendrantoro Kusuma, Hendra Siswanto Muhammad Nur Rahman Suwadi Suwadi