Analisis Performansi Fso Dengan Teknik Ofdm Pada Kanal Kim Dan Kruse Menggunakan Modulasi Qpsk (performance Analysis Of Fso With Ofdm Technique In Kim And Kruse Channel Using Qpsk Modulation)

Abstract

Abstrak
Sistem Optical Wireless Communication (OWC) salah satu alternatif teknologi indoor
dan outdoor yang tepat, dimana teknologi Free Space Optics (FSO) salah satu pengembangan
teknologi komunikasi optik, praktiknya digabungkan dengan teknologi Orthogonal
Frequency Division Multiplexing (OFDM) memiliki keunggulan kecepatan data kirim
dengan kapasitas bandwidth yang besar. Tugas Akhir ini melakukan simulasi dan analisis
performansi sistem OFDM pada FSO menggunakan modulasi QPSK dengan kanal Kim dan
Kruse pada pengaruh variasi panjang gelombang, daya kirim terhadap performansi sistem
dikondisi visibility atmosfir serta jarak dari pengirim ke penerima dengan acuan Bit Error
Rate (BER)<10-4
.
Hasil simulasi dan analisis didapatkan peningkatan panjang gelombang dari 850 nm
sampai 1550 nm meningkatkan performansi sistem pada kanal Kim dikondisi visibility
atmosfer 0.02 km dan Kruse 0.1 km. Peningkatan daya kirim 2 watt dapat menghasilkan
peningkatan performansi sistem dikondisi visibility atmosfer 0.02 km. Peningkatan panjang
gelombang dapat menambah jarak pada kanal Kim di clear air 0.43 km, light fog 0.53 km,
dense fog 0,02 km dan Kruse di clear air 0.38 km, light fog 0.47 km, namun dikondisi dense
fog tidak memenuhi standar BER, hanya panjang gelombang 1550 nm yang memenuhi
standar BER. Penambahan nilai FFT dapat memperbanyak jumlah subcarrier sehingga
performansi sistem meningkat dan mengurangi bit error sehingga nilai BERnya semakin
kecil.
Kata Kunci : FSO, OFDM, QPSK, BER, Kim, Kruse
Abstract
The Optical Wireless Communication (OWC) system is an alternative for indoor and
outdoor technology, where Free Space Optics (FSO) technology is one of the developments in
optical communication technology, in practice combined with Orthogonal Frequency Division
Multiplexing (OFDM) technology has the advantage of data speeds with large bandwidth
capacity. This final project simulation and analysis of OFDM performance system at FSO using
QPSK modulation with Kim and Kruse channels on the effect of wavelength variations,
transmitted power on performance system in atmospheric visibility conditions and distance from
transmitter to receiver with reference to Bit Error Rate (BER) <10-4
.
The results obtained an increasing of wavelength from 850 nm to 1550 nm to increase
the performance system in Kim channel is 0.02 km and 0.1 km in Kruse at atmospheric visibility
conditions. An increasing transmitted power 2 watts can result increasing performance system
at atmospheric visibility condition by 0.02 km. The increase in wavelength can increase the
distance to the Kim channel at clear air 0.43 km, light fog 0.53 km, dense fog 0.02 km and
Kruse at clear air 0.38 km, light fog 0.47 km, but in conditions dense fog doesn’t reach BER
standards, only 1550 nm reach BER standards. The increasing of FFT value can increase the
number of subcarriers so that system performance increases and reduces bit error so that the
BER value is getting lower.
Keywords: FSO, OFDM, QPSK, BER, Kim, Kruse