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All Journal JURNAL NASIONAL TEKNIK ELEKTRO JOURNAL OF INFORMATICS AND TELECOMMUNICATION ENGINEERING
Suhartono Tjondronegoro
Institut Teknologi Bandung
Computer Science & IT Electrical & Electronics Engineering Engineering

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Performance Analysis of STBC 4x4 MIMO using Ray Tracing Channel Modelling in WLAN Technology Hasbi Nur Prasetyo Wisudawan; Suhartono Tjondronegoro
JOURNAL OF INFORMATICS AND TELECOMMUNICATION ENGINEERING Vol 5, No 1 (2021): EDISI JULY 2021
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jite.v5i1.5206

Abstract

IEEE 802.11n technology comes with many advantages such as high data rate and reliability. In 2,4 GHz and 20 MHz bandwidth, it gives data rate up to 300 Mbps. In order to improve reliability without complexity, it uses STBC (Space Time Block Coding) using Alamouti algorithm. This algorithm can be implemented with many STBC scheme, i.e., 2x1, 2x2, 3x1, 3x2, 3x3, 4x1, 4x2, 4x3 and 4x4 using BPSK, QPSK, 16-QAM and 64-QAM modulation. Impulse respons of (Laboratorium Telekomunikasi Radio dan Gelombang Mikro) LTRGM indoor channel can be modeled by using ray tracing method. This simulation also investigates the effect of MIMO channel corelation caused by channel fading and physical antenna factor. The results, LTRGM indoor channel give delay spread and rms delay of 71.94 ns and 1.5 ns respectively. The ergodic channel capacity declines steadily as the channel correlation becomes worse. This problem also cause a decrease in SNR performance to achieve SER of 10-3 with various modulation. However, this does not have significant influence on WLAN system that uses STBC with four both transmit and receive antenna
Analisis Pengolahan Sinyal Radar Frequency Modulated Continuous Wave untuk Deteksi Target Siska Aulia; Suhartono Tjondronegoro; Rahmadi Kurnia
JURNAL NASIONAL TEKNIK ELEKTRO Vol 2 No 2: September 2013
Publisher : Jurusan Teknik Elektro Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (800.976 KB) | DOI: 10.25077/jnte.v2n2.86.2013

Abstract

On this report has been simulated signal generation Frequency Modulated Continuous Wave (FMCW) radar to determine the distance and speed of the target. This design FMCW radar system for traffic management applications that monitor ground traffic. FMCW system does not require a large transmit power to obtain sufficient Signal to Noise (SNR)  values for target detection process. FMCW radar system's ability to detect targets depends on the signal SNR beat. Target reflected signal indicates the presence of a moving target motion characteristics and Radar Cross Section (RCS). Beat signal SNR used in this study was 20 dB, where the characteristics of the target RCS fluctuations are modeled by models swerling 5 (without fluctuations) and probability of false alarm is 10-7. Radar system to detect moving targets using the doppler effect.  GNU Radio as Software Defined Radios are used in the telecommunications simulation. Radar front end basically has the same architecture with radio communications in general, software defined radio, can be used to design FMCW radar to reduce the cost and complexity of the calculations. FMCW radar signal processing is simulated in Matlab and GNU radio capable of detecting a single target and five targets. Simulation results obtained with the calculation. Keywords: FMCW radar, GNU Radio, beat signal, doppler effect     AbstrakPenelitian ini mensimulasikan pembangkitan sinyal radar Frequency Modulated Continuous Wave (FMCW) untuk mendeteksi target dengan informasi jarak dan kecepatan target. Sistem radar FMCW ini didesain untuk aplikasi pengaturan lalu lintas darat yaitu memonitoring lalu lintas. Sistem radar FMCW tidak memerlukan daya pancar yang besar untuk mendapatkan nilai Signal to Noise (SNR) yang cukup untuk proses deteksi target. Kemampuan sistem radar FMCW untuk mendeteksi target tergantung pada SNR sinyal beat. Sinyal yang dipantulkan oleh target bergerak menunjukkan adanya kehadiran suatu target yang memiliki karakteristik gerak dan Radar Cross Section (RCS). SNR sinyal beat yang digunakan pada penelitian ini 20 dB, dimana karakteristik target dimodelkan dengan model fluktuasi RCS swerling 5 (tanpa fluktuasi) dan probabilitas false alarm yaitu 10-7. Sistem radar untuk mendeteksi target bergerak dengan menggunakan efek doppler. Simulasi GNU Radio sebagai Software Defined Radio digunakan dalam simulasi telekomunikasi. Radar front end pada dasarnya memiliki arsitektur yang sama dengan komunikasi radio pada umumnya, software defined radio, dapat digunakan untuk mendesain radar FMCW untuk mengurangi biaya dan kompleksitas dalam perhitungannya. Pengolahan sinyal radar FMCW yang disimulasikan pada Matlab dan GNU radio mampu mendeteksi satu target dan lima target. Hasil simulasi yang diperoleh sama dengan hasil perhitungan.Keywords : FMCW radar, GNU Radio, beat signal, doppler effect  
Co-Authors Rahmadi Kurnia Siska Aulia Wisudawan, Hasbi Nur Prasetyo