Analisa Karakteristik Kanal HF Lintasan Jamak
DOI:
https://doi.org/10.22441/jte.2020.v11i3.002Keywords:
HF lintasan jamak, respon impuls, power delay profile, delay spread, karakterisasi kanalAbstract
Indonesia merupakan negara kepulauan terbesar di dunia. Oleh karena itu, diperlukan konsep dan perencanaan sistem komunikasi jarak jauh yang murah dan handal agar bisa terhubungnya komunikasi di wilayah kepulauan yang relatif sulit dijangkau oleh sistem kabel yang sudah terhubung saat ini. Sistem komunikasi high frequency (HF) yang beroperasi pada frekuensi 3-30 MHz. Sistem ini memanfaatkan lapisan ionosfer sebagai media transmisi gelombang radionya. Lapisan ionosfer sangat dipengaruhi oleh aktivitas matahari dan perubahan waktu sepanjang hari. Hal ini berakibat timbulnya gangguan-gangguan ionosfer yang menyebabkan kinerja sistem komunikasi HF terganggu juga kondisi dimana terdapat interferensi ketika sinyal lebih dari satu jalur pada saat ditransmisikan hal ini dinamakan multipath atau lintasan jamak. Karakteristik kanal HF menjadi hal yang sangat penting. Dengan mengetahui karakteristik kanal HF yang tepat kita dapat mencapai kinerja sistem komunikasi yang lebih baik. Perubahan kondisi lapisan ionosfer berpotensi mempengaruhi kinerja sistem komunikasi HF yang disebabkan oleh nilai delay spread. Pada penelitian ini dilakukan analisa parameter karakteristik kanal HF mengenai power delay profile dan delay spread yang dilakukan dengan uji simulasi. Berdasarkan hasil percobaan dalam kurun waktu 2 bulan. Dilakukan sebanyak 8 kali percobaan dalam 4 waktu yang berbeda. Menghasilkan nilai delay spread maksimal terjadi pada pagi hari yaitu bernilai 124,1 ms berbeda dengan sore hari yang memiliki nilai 41 ms.
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References
Australian Government, “IPS Radio and Space Services, Introduction to HF Radio Propagation” Sidney, Australia. 2007
L. F. McNamara, "The Ionosphere: Communication, Surveillance, and Direction Finder". Krieger Publishing Company. 1991
J. Lastovicka and A. Bourdillon, ”Ionospheric Effects on Terrestrial Communications: Working Group 3 Overview, Annals of Geophysics”. Supplement to vol. 47, no. 2/3, pp. 1269-1276. 2014
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