NURSIAGA, RAHMAT (2019) ANALISIS EFISIENSI TRANSPONDER SATELIT MENGGUNAKAN PAIRED CARRIER MULTIPLE ACCESS LOW DENSITY PARITY CHECK. S2 thesis, Universitas Mercu Buana Jakarta-Menteng.
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Abstract
Salah satu permasalahan komunikasi satelit adalah keterbatasan bandwidth dan daya transponder sementara perkembangan teknologi membutuhkan bandwidth ( lebar pita ) yang cenderung meningkat. Pada Single Channel Per Carrier ( SCPC) konvensional membutuhkan dua buah frekuensi pembawa ( carrier ) untuk komunikasi full duplek tetapi dengan menggunakan SCPC Paired Carrier Multiple Access ( PCMA ) hanya membutuhkan satu frekuensi carrier saja sehingga terjadi penghematan bandwidth 50%. Disamping penghematan bandwidth perlu diperhatikan pula efisiensi terhadap penggunaan daya transponder. Penelitian ini menggunakan metode eksperimen dengan instalasi satu pasang link komunikasi VSAT SCPC. Pangambilan data meliputi bandwidth dan daya yang digunakan oleh masing – masing stasiun bumi dengan mengubah- ubah set up modem yang meliputi modulasi, FEC dan code. Setelah itu dihitung nilai efsiensi penggunaan transpondernya dan didapatkan hasil pemakaian SCPC PCMA dengan modcod QPSK LDPC 2/3, QPSK LDPC 3/4, 8PSK LDPC 2/3, QPSK TPC 3/4 dan QPSK TPC 7/8 memberikan efisiensi sebesar 50 %. Modcod 8PSK LDPC 3/4 efisiensi 41,63 %, 8PSK TPC 3/4 efisiensi 30,61 % dan 8PSK TPC 7/8 efisiensi 31,68 %. Sedangkan Modcod 16QAM LDPC efisiensi hanya 6,70 %. Modcod 16QAM TPC 3/4 dan 16QAM TPC 7/8 tidak direkomendasikan untuk digunakan karena boros dalam pemakaian transponder satelit. Modcod 8PSK LDPC 2/3 adalah paling optimal karena menggunakan kapasitas transponder terkecil 3,85 % sementara efisiensi yang dihasilkan 50 ,06%. Perubahan power limited menjadi bandwidth limited efisiensi naik dan nilai bit error rate juga naik. Penggunaan Code LDPC pada PCMA lebih hemat dalam penggunaan power trasnponder tetapi delay time lebih tinggi 24 ms dibandingkan dengan TPC pada FEC 3/4. Kata Kunci : Paired Carrier Multiple Accses, efisiensi, Turbo Product Code, Low Density Parity Check One of the problems of satellite communication is limited bandwidth and transponder power while technological developments require bandwidth which tends to increase. In conventional Single Channel Per Carrier (SCPC) requires two carrier frequencies for full duplex communication but using SCPC Paired Carrier Multiple Access ( PCMA ) requires only one carrier frequency so that 50% bandwidth savings occur. Besides saving bandwidth, it should be noted also the efficiency of used the transponder power. This research uses an experimental method by installing one pair of VSAT SCPC communication links. Data retrieval includes the bandwidth and power used by each earth station by changing the modem settings that are added modulation, FEC and code. After that the calculated value of the efficiency of the use of the transponder is calculated and the results are obtained SCPC PCMA with QPSK LDPC 2/3, QPSK LDPC 3/4 , 8PSK LDPC 2/3, QPSK TPC 3/4 and QPSK TPC 7/8 modcods provide 50 % efficiency. 8PSK LDPC 3/4 modcod 41.63% efficiency, 8PSK TPC 3/4 30.61% efficiency and 8PSK TPC 7/8 31,68% efficiency. While the 16QAM LDPC modcod only 7.34% efficiency. The 16QAM TPC 3/4 and 16QAM TPC 7/8 modcods are not recommended because wasteful use of satellite transponders. The 8PSK LDPC 2/3 modcod is the most optimal because it uses the smallest transponder capacity 3,85% while the resulting efficiency is 50,06%. The change in power limited to bandwidth limited efficiency increase but bit error rate also increase. The use of LDPC Code on PCMA is more efficient in using power transponders but the delay time is higher than 24 ms compared to TPC on FEC 3/4. Keywords : Paired Carrier Multiple Accses, efficiency , Turbo Product Code, Low Density Parity Check.
| Item Type: | Thesis (S2) |
|---|---|
| Call Number CD: | CDT-554-20-003 |
| NIM/NIDN Creators: | 55417110027 |
| Uncontrolled Keywords: | Paired Carrier Multiple Accses, efficiency , Turbo Product Code, Low Density Parity Check,Paired Carrier Multiple Accses, efisiensi, Turbo Product Code, Low Density Parity Check |
| Subjects: | 600 Technology/Teknologi > 620 Engineering and Applied Operations/Ilmu Teknik dan operasi Terapan > 621 Applied Physics/Fisika terapan |
| Divisions: | Pascasarjana > Magister Teknik Elektro |
| Depositing User: | ORYZA LUVITA |
| Date Deposited: | 17 Mar 2022 07:36 |
| Last Modified: | 18 Jun 2022 05:58 |
| URI: | http://repository.mercubuana.ac.id/id/eprint/58215 |
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