Oktarini, Nadya Noor (2015) Implementasi Dan Evaluasi Kinerja Encoder-Decoder Reed Solomon Pada M-Ary Quadrature Amplitude Modulation (M-Qam) Mengunakan Wireless Open-Access Research Platform (Warp). Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Teknik modulasi multilevel seperti M-ary Quadrature Amplitude Modulation (M-QAM) memiliki kelemahan yaitu semakin tinggi level modulasi yang digunakan, maka semakin tinggi pula nilai BER yang dihasilkan. Hal ini menyebabkan kinerja sistem menjadi tidak maksimal karena sistem semakin tidak tahan terhadap noise. Salah satu teknik error control coding yang digunakan untuk mendeteksi kesalahan sekaligus memperbaiki kesalahan yaitu kode Reed Solomon. Kelebihan dari kode Reed Solomon adalah sifatnya yang nonbinary artinya data diolah dalam simbol sehingga kemampuan koreksi data lebih banyak. WARP (Wireless Open Access Research Platform) merupakan salah satu jenis dari teknologi SDR (Software Defined Radio) yang bisa diprogram untuk membuat prototype sistem komunikasi nirkabel. Perangkat WARP ini dapat diterapkan untuk berbagai aplikasi, salah satunya untuk teknik pengkodean reed olomon yang digunakan pada teknik modulasi digital M-QAM. Pengimplementasian encoder dan decoder reed solomon dengan menggunakan perangkat WARP bertujuan untuk membandingkan modulasi M-QAM dengan dan tanpa kode reed solomon, kemudian mengetahui kinerja code rate yang berbeda pada modulasi M-QAM, serta mengetahui pengaruh besarnya daya pancar dan jarak pada system komunikasi
Pada sistem kode RS (15,13) memberikan perbaikan pada modulasi 4-QAM,8-QAM,16-QAM dengan nilai secara berturut-turut 2,5 dB, 2,2 dB dan 2,5 dB. Pada sistem kode RS (15,11) memberikan perbaikan pada modulasi 4-QAM,8-QAM,16-QAM,32-QAM, dan 64-QAM dengan nilai secara berturut-turut 3,5 dB, 3 dB, 5 dB, 2 dB dan 0,5 dB. Pada sistem kode RS (15,9) memberikan perbaikan pada modulasi 4-QAM,8-QAM,16-QAM,32-QAM, dan 64-QAM dengan nilai secara berturut-turut 4,8 dB, 4,5 dB, 6 dB, 4 dB dan 3 dB. Hasil
implementasi terburuk terdapat pada sistem RS (15,13) dibandingkan
dengan sistem RS (15,11) dan RS (15,9). Hasil ini karena RS (15,13)
hanya memiliki kemampuan koreksi error ganda (t=1) dengan ukuran k
yang sama. Sementara hasil implementasi terbaik terdapat pada sistem
RS (15,9) yang mana dapat memperbaiki kesalahan di semua level
modulasi karena memiliki kemampuan koreksi error ganda (t=3) dengan
ukuran k yang sama. Implementasi dengan menggunakan WARP, dapat
diamati performa sistem terhadap pengaruh jarak antara antena
pemancar dan penerima. Sehingga didapatkan kesimpulan bahwa nilai
BER akan semakin besar terhadap bertambahnya jarak antar node untuk
daya pancar tetap, ini menandakan jarak sangat mempengaruhi kualitas
kinerja suatu sistem komunikasi.
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Multilevel modulation techniques such as M-ary Quadrature
Amplitude Modulation (M-QAM) has the disadvantage of higher levels
of modulation used, the higher the BER value generated. This causes
system performance to be not optimal because the system less resistant
to noise.
One of the error control coding technique that is used to detect
errors and improve the Reed Solomon code error is. The advantages of
Reed Solomon code is non-binary nature of data processed in the
symbol means that more data correction capability. WARP (Wireless
Open Access Research Platform) is one type of technology SDR
(Software Defined Radio) that can be programmed to create a prototype
of a wireless communication system. WARP device can be applied to a
variety of applications, one of them for reed solomon coding techniques
used in digital modulation technique M-QAM.
Implementation reed solomon encoder and decoder using the
WARP aims to compare M-QAM modulation with and without the reed
solomon code, then determine the performance of different code rate on
M-QAM modulation, as well as determine the amount of transmit power
and influence within the communication system.
In RS (15.13) to provide improvements to the 4-QAM
modulation, 8-QAM, 16-QAM with values respectively 2.5 dB, 2.2 dB
and 2.5 dB. In the system code RS (15,11) to provide improvements to
the 4-QAM modulation, 8-QAM, 16-QAM, 32-QAM and 64-QAM with
values respectively 3.5 dB, 3 dB, 5 dB, 2 dB and 0.5 dB. In the RS code
system (15.9) to provide improvements to the 4-QAM modulation, 8-
QAM, 16-QAM, 32-QAM and 64-QAM with consecutive values of 4.8
dB, 4.5 dB, 6 dB, 4 dB and 3 dB. The worst are the results of the
implementation of the system RS (15.13) compared to the RS system (15.11) and RS (15.9). This results because the RS (15.13) has only a
double error correction capability (t = 1) with the same size k. While the
best results are on the system implementation RS (15.9) which can fix
errors in all levels of modulation because it has a double error
correction capability (t = 3) with the same size k. Implementation using
WARP, can be observed the performance of the system against the
effects of the distance between the transmitter and receiver antennas. So
it was concluded that the BER value will be greater for the increasing
distance between nodes to transmit power remains, it indicates the
distance greatly affect the quality of the performance of a
communication system.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSE 621.382 23 Okt i |
| Uncontrolled Keywords: | M-QAM, Reed Solomon, WARP ======================================================================= M-QAM, Reed Solomon, WARP |
| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK201 Electric Power Transmission T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK1322.6 Electric power-plants |
| Divisions: | Faculty of Electrical Technology > Electrical Engineering > 20201-(S1) Undergraduate Thesis |
| Depositing User: | - Taufiq Rahmanu |
| Date Deposited: | 26 Mar 2019 08:20 |
| Last Modified: | 27 Mar 2019 08:05 |
| URI: | http://repository.its.ac.id/id/eprint/62590 |
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