Differentina, Aurum Puji Rahma (2017) Komunikasi Akustik Bawah Air dengan Time Reversal Menggunakan Filtered Multitone Modulation. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Karena kanal multipath yang disebabkan dari time-reversal (TR) komunikasi akustik bawah air menggunakan single-carrier (SC) dengan modulasi tinggi berjumlah sangat banyak, maka akan menimbulkan adanya Intersymbol Interference (ISI). ISI yang disebabkan oleh multipath tersebut akan mengurangi kinerja proses TR sehingga perlu dihilangkan menggunakan adaptive equalizer. Dalam tugas akhir ini, metode komunikasi akustik TR menggunakan filtered multitone (FMT) modulation dimaksudkan untuk meningkatkan kinerja proses TR dengan mengurangi sisa ISI dalam sinyal yang diproses serta mengurangi kompleksitas adaptive equalizer untuk post-process.
Modulasi FMT digunakan untuk memodulasi simbol informasi ke subcarrier terpisah dengan memanfaatkan bandwidth masing-masing subcarrier. Pada sistem ini menggunakan adaptive equalization dengan algoritma RLS yang ada pada penerima untuk menekan sisa ISI dan noise. Kinerja dari metode yang diusulkan ini dinilai melalui simulasi dan data real dari uji coba di kolam eksperimental. Uji coba ini dilakukan dengan variasi jarak 11 m, 40 m, dan 70 m. Hasil analisa TR menggunakan modulasi FMT pada jarak 11 m memiliki nilai BER sebesar 0.018 yang lebih kecil dibandingkan dengan TR menggunakan SC yaitu memiliki nilai BER sebesar 0.07. Hal tersebut menunjukkan bahwa performansi TR menggunakan modulasi FMT lebih baik daripada menggunakan modulasi SC. =================================================================================================== Since the multipath channel caused by the Time Reversal (TR) of acoustic communication underwater using a single carrier (SC) with high modulation are very numerous, then there will be Intersymbol Interference (ISI) . ISI that caused by the multipath will reduce performance of TR process, have to be eliminated using an adaptive equalizer. In this final project, the acoustic communication TIME Reversal method uses filtered multitone modulation (FMT) to improve performance time reversal method itself by reducing the remaining ISI and help reducing the complexity of the adaptive equalizer for the post process. FMT modulation is used to modulate information symbols into separate subcarriers. In this system it uses an adaptive equalization with existing RLS algorithm on the receiver to hold the rest of ISI and noise. The performance of the proposed method is assessed through simulations and real data from trials in experimental ponds. The trial was conducted with variations of distance of 11 m, 40 m, and 70 m.
TR analysis trial result using FMT modulation at distance of 11 m has BER value equals to 0,018 which is lower compare to TR using SC that has BER value equal to 0.23. It shows that the performance of TR using FMT modulation is better than using SC modulation.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | FMT modulation, Time Reversal, ISI, adaptive equalization |
| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101 Telecommunication T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5102.5 Modulation (Electronics), Demodulation (Electronics) |
| Divisions: | Faculty of Industrial Technology > Electrical Engineering > 20201-(S1) Undergraduate Thesis |
| Depositing User: | Aurum Puji Rahma D. |
| Date Deposited: | 15 Sep 2017 04:45 |
| Last Modified: | 06 Mar 2019 02:40 |
| URI: | http://repository.its.ac.id/id/eprint/43218 |
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