Kurniawati, Indah (2019) Pemodelan Kanal Radio Hf Skywave Multipath Multimode Di Daerah Lintang Rendah. Doctoral thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Komunikasi dengan High Frequency (HF) jarak jauh dengan alokasi 3 – 30 MHz banyak dipergunakan dalam di daerah terpencil dan kurang infrastruktur komunikasi terutama untuk mengatasi mahalnya teknologi satelit dan sebagai alternatif saat terjadi bencana. Penelitian tentang kanal radio HF di daerah lintang rendah masih sangat sedikit dibandingkan dengan penelitian untuk daerah lintang tinggi dan lintang menengah padahal kanal ionosfer pada daerah lintang rendah memiliki karakteristik tersendiri.
Penelitian bertujuan untuk memodelkan secara statistik respons impuls kompleks dari kanal HF jarak jauh dengan parameter seperti channel gain, path gain, pergeseran fase dan delay spread, melalui simulasi dan pengukuran pada link Surabaya-Merauke sejauh 3044 km. Hasil evaluasi menunjukkan bahwa lintasan yang datang berasal dari mode yang berbeda yang membentuk cluster-cluster berdasarkan delay-nya. Dari hasil penenelitian diketahui bahwa channel gain berdistribusi Rayleigh, sedangkan rms delay spread dan maximum excess delay masing-masing berdistribusi Rayleigh dan Gaussian. Model-model yang dihasilkan dapat dipergunakan untuk merancang sistem komunikasi digital HF pada daerah lintang rendah. Tujuan kedua dari penelitian ini adalah untuk mengetahui korelasi spasial antar dua link di daerah lintang rendah yang masing-masing berjarak 3044 km dan 1895 km, dengan penerima terpisah sejauh 1900 km. Berdasarkan hasil simulasi yang diverifikasi dengan pengukuran dan simulasi pada tanggal yang berbeda diketahui bahwa kedua link yang terdiri dari multimode dan multihop memiliki korelasi yang rendah yang merupakan hasil dari penjumlahan fase yang acak dan tidak berkorelasi. Dari penelitian ini juga dibuktikan bahwa site diversity yang menggunakan selection combining dengan dua link yang konvergen dapat meningkatkan diversity gain dan menurunkan probabilitas outage secara signifikan. Untuk meningkatkan hasil dari site diversity dipergunakan joint space frequency diversity yang melibatkan dua frekuensi yang memiliki karakteristik diurnal yang berlawanan.
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The long distance high frequency (HF) communication with an allocation of 3 - 30 MHz is widely used in remote areas and lacking communication infrastructure, especially to overcome the high cost of satellite technology and as an alternative when a disaster occurs. The research on the HF radio channels in the low latitudes area is still rarely done compared to studies for the high latitudes and the middle latitudes areas whereas the ionospheric channels in the low latitudes area has its own characteristics. The study aims to model statistically complex impulse responses from the long distance HF channels with the parameters such as channel gain, path gain, phase shift and delay spread, through the simulations and the measurements on the Surabaya-Merauke link as far as 3044 km. The evaluation results show that the paths that comes generated from the different modes that form clusters based on the delay. The results of the study shown that the gain channel is Rayleigh distribution, while the rms delay spread and maximum excess delay are each distributed Rayleigh and Gaussian respectively. The models produced can be used as the basis for designing the HF digital communication systems in the low latitudes area. The second goal of this study was to find out the spatial correlation between two links in the low latitudes area, each of which was 3044 km and 1895 km, with the receivers separated by 1900 km. Based on the simulation results that are verified by the measurements and the simulations on different dates, it is known that the two links consisting of multimodes and multihops have a low correlation which is the result of the sum of phases that are random and uncorrelated. From this study, it was also proved that site diversity that applies selective combining with two convergent links may increase the diversity gain and reduce the probability of outage significantly. To improve the results of site diversity it is used a joint space-frequency diversity involving the two frequencies that have opposite diurnal characteristics.
| Item Type: | Thesis (Doctoral) |
|---|---|
| Uncontrolled Keywords: | HF Radio Channel, Impulse response, low latitude area, long distance, site diversity, spatial correlation |
| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5103.2 Wireless communication systems. Two way wireless communication T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK6564 Radio transmitter-receivers T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101 Telecommunication |
| Divisions: | Faculty of Electrical Technology > Electrical Engineering > 20001-(S3) PhD Thesis |
| Depositing User: | Ms Indah Kurniawati |
| Date Deposited: | 23 Jul 2026 06:24 |
| Last Modified: | 23 Jul 2026 06:24 |
| URI: | http://repository.its.ac.id/id/eprint/70409 |
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