Simulator Sistem Radar CC-OFDM MIMO Berbasis WEB

Kahfi, Andi Agung (2025) Simulator Sistem Radar CC-OFDM MIMO Berbasis WEB. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Radar Multiple Input Multiple Output (MIMO) merupakan teknologi canggih yang memberikan peningkatan signifikan dalam jangkauan deteksi dan resolusi spasial dibandingkan radar konvensional. Dengan menggunakan hingga 101 elemen antena pemancar yang dapat dikendalikan secara independen, sistem ini mampu membentuk hingga 63 beam simultan dalam satu waktu. Untuk meningkatkan efisiensi spektral, skema Orthogonal Frequency Division Multiplexing (OFDM) diimplementasikan dengan lebar bandwidth 2.56 MHz per subband, yang kemudian dikombinasikan dengan teknik Circulating Codes (CC) guna mengatasi tantangan seperti tingginya Peak-to-Average Power Ratio (PAPR) serta untuk memperbaiki struktur pancaran gelombang.
Simulator ini memungkinkan analisis menyeluruh terhadap pola radiasi antena, array factor, serta transmisi sinyal CC-OFDM, baik dalam kondisi ideal maupun ketika terpapar gangguan seperti phase noise sebesar 500 kHz, 50 kHz, 10 kHz, dan 1 kHz. Hasil simulasi menunjukkan bahwa metode tapering amplitudo menggunakan Taylor window mampu menurunkan sidelobe level hingga -30.302 dB, dibandingkan metode uniform yang hanya mencapai -13.174 dB. Selain itu, dalam skenario transmisi 12 simbol per beam, sistem berhasil mengalokasikan simbol ke subband secara dinamis di frekuensi 20 MHz hingga 40.48 MHz. Hasil simulasi array factor menunjukkan bahwa ketidakstabilan frekuensi osilator sebesar 500 kHz dapat menyebabkan pergeseran arah beam utama hingga 1.3°. Sementara itu, pada kondisi phase noise sebesar 50 kHz, pergeseran arah hanya terjadi sebesar 0.1°, menunjukkan pentingnya kontrol kestabilan frekuensi dalam sistem radar digital.
Simulator ini dikembangkan menggunakan MATLAB App Designer dengan antarmuka yang intuitif dan interaktif, serta telah diimplementasikan sebagai aplikasi berbasis web melalui MATLAB Web App Server untuk meningkatkan aksesibilitas. Pengembangan lebih lanjut disarankan pada sisi manajemen subband adaptif, integrasi mitigasi noise, serta optimalisasi performa server. Secara keseluruhan, simulator ini diharapkan dapat menjadi sarana yang efektif dalam penelitian, pembelajaran, dan pengembangan sistem radar MIMO berbasis CC-OFDM di masa depan.
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Multiple Input Multiple Output (MIMO) radar is an advanced technology that offers significant improvements in detection range and spatial resolution compared to conventional radar systems. By utilizing up to 101 independently controlled transmit antenna elements, the system is capable of forming up to 63 simultaneous beams. To enhance spectral efficiency, the system employs Orthogonal Frequency Division Multiplexing (OFDM) with a 2.56 MHz bandwidth per subband, further optimized through the application of Circulating Codes (CC) to address challenges such as high Peak-to-Average Power Ratio (PAPR) and to improve waveform radiation characteristics.
This simulator enables a comprehensive analysis of antenna radiation patterns, array factor, and CC-OFDM signal transmission, both under ideal conditions and when exposed to disturbances such as phase noise of 500 kHz, 50 kHz, 10 kHz, and 1 kHz. Simulation results demonstrate that amplitude tapering using a Taylor window can reduce the sidelobe level down to -30.302 dB, compared to the uniform method which only achieves -13.174 dB. Additionally, in a scenario involving the transmission of 12 symbols per beam, the system successfully allocates symbols dynamically across subbands within a frequency range of 20 MHz to 40.48 MHz. The array factor simulations reveal that oscillator frequency instability of 500 kHz can cause a main beam direction shift of up to 1.3°, while phase noise of 50 kHz results in a shift of only 0.1°, highlighting the critical importance of frequency stability control in digital radar systems.
The simulator is developed using MATLAB App Designer, featuring an intuitive and interactive user interface, and is deployed as a web-based application via the MATLAB Web App Server to enhance accessibility. Future developments are recommended to refine adaptive subband management, integrate noise mitigation techniques, and improve server performance. Overall, the simulator serves as an effective tool for research, education, and the advancement of CC-OFDM-based MIMO radar systems.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Circulating codes, Kode Golay, Multi-beam, OFDM, Radar MIMO, Web
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5102.9 Signal processing. T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5103.484 Orthogonal frequency division multiplexing. T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101 Telecommunication
Divisions:	Faculty of Electrical Technology > Electrical Engineering > 20201-(S1) Undergraduate Thesis
Depositing User:	Andi Agung Kahfi
Date Deposited:	28 Jul 2025 04:07
Last Modified:	28 Jul 2025 04:07
URI:	http://repository.its.ac.id/id/eprint/122228

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