Putra, Aditya Sukmana (2015) Implementasi dan Evaluasi Kinerja Direct Sequence Spread Spectrum Menggunakan Wireless Open-Access Research Platform (WARP). Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Dalam sistem komunikasi nirkabel, khususnya pada dunia komunikasi
taktis atau militer, salah satu yang harus dihadapi adalah gangguan
jamming. Informasi yang dikirimkan harus tahan terhadap jamming dan
aman, sehingga informasi hanya bisa diterima oleh sisi penerima yang
diinginkan saja.
Salah satu sistem yang dapat mengatasi masalah tersebut adalah Direct
Sequence Spread Spectrum (DSSS) dimana informasi akan dikalikan
secara langsung dengan pseudo-noise sequence yang mempunyai laju
chip jauh lebih besar, sehingga sinyal akan dikirimkan pada bandwidth
yang jauh lebih besar dari laju bit. Sistem ini dapat diimplementasikan
pada Wireless Open-Access Research Platform (WARP) yang merupakan
salah satu dari jenis Software Define Radio (SDR). Dengan WARP dapat
terlihat unjuk kerja sistem secara real/nyata pada kanal nirkabel . Modul
WARP mampu diprogram secara langsung dengan software MATLAB,
sehingga pemodelan sistem baseband, passband pada pengirim dan
penerima dapat dilakukan dengan mudah.
Pengujian dilakukan untuk mengetahui kinerja sistem DSSS pada WARP
yang bekerja pada frekuensi 2,4 GHz yang ditampilkan dalam bentuk
grafik Bit Error Rate (BER) terhadap variasi nilai daya sinyal jamming
dengan mengirimkan 38400 bit. Kinerja sistem terbaik didapatkan ketika
daya sinyal jamming lebih kecil atau sama dengan daya sinyal carrier
sistem DSSS. Pada Single Tone Jamming (STJ) sistem akan mencapai
nilai BER 10−3 saat daya sinyal jamming 125 % dari daya sinyal sistem
DSSS, sedangkan pada Multi Tone Jamming (MTJ) sistem akan mencapai
BER 10−3 saat daya sinyal jamming 100 % dari daya sistem DSSS.
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In wireless communication systems, especially in the world or military
tactical communications, one of which must be faced is jamming
interference. The information submitted must be resistant jamming
interference and secure, so that information can be received by intended
recipient.
One of the most system which can solve the problem is Direct Sequence
Spread Spectrum (DSSS) which the information will be multiplied
directly with the pseudo-noise sequence which have a chip rate is much
greater, so that the signal will be sent in much greater bandwidth than the
bit rate. This system can be implemented in the Wireless Open-Access
Research Platform (WARP), which is one of the types of Software Define
Radio (SDR). In WARP system performance can be seen in real condition
on the wireless channel. WARP module capable programmed directly
with MATLAB software, so the baseband, passband modeling system,
transmitter and receiver can be done easily.
Testing was conducted to determine the performance of DSSS system in
WARP are working at frequency 2.4 GHz is displayed in graphical form
Bit Error Rate (BER) of the variation of the jamming signal power by
sending 38400 bits. The best system performance is obtained when the
jamming signal power is less than or equal to the carrier signal power
DSSS system. In Single Tone Jamming (STJ) the system will reach a
value of BER 10−3 when jamming signal power 125% of the signal
power DSSS system, while the Multi Tone Jamming (MTJ) system will
achieve BER 10−3 when jamming signal power 100% of the DSSS
system power.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSE 621.382 23 Put i |
| Uncontrolled Keywords: | DSSS, WARP, SDR, BER, STJ, MTJ. |
| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101 Telecommunication |
| Divisions: | Faculty of Industrial Technology > Electrical Engineering > 20201-(S1) Undergraduate Thesis |
| Depositing User: | Users 13 not found. |
| Date Deposited: | 31 May 2017 02:38 |
| Last Modified: | 24 Aug 2018 04:29 |
| URI: | http://repository.its.ac.id/id/eprint/41439 |
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