Implementasi dan Evaluasi Kinerja Direct Sequence Spread Spectrum Menggunakan Wireless Open-Access Research Platform (WARP)

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. ================================================================================================================== 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 > (S1) Undergraduate Theses
Depositing User: Mrs Ansi Aflacha
Date Deposited: 31 May 2017 02:38
Last Modified: 31 May 2017 02:38
URI: http://repository.its.ac.id/id/eprint/41439

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