Abstract
One of the techniques that are used to define the multipath fading it can make is Ortoghonal Frequency Division Multiplexing (OFDM). System on multicarrier technique is one that has a frequency of orthogonal to each other by using a narrow bandwidth. The weakness of the system on which occurred in mobile channel due to the technique of the time on a channel so that orthogonalitas on a subchannel would pose intercarrier interference and missing (ICI). This research aims to analyze the intercarrier interference (ICI) on the system on MIMO using BPSK and QPSK modulation in fading channel. In terms of values and graph of Bit Error Rate (BER) is proportional to the energy per Bit to noise (Eb/no). This research also aims to find out the influence of frequency on the system on-MIMO offset. The results of the comparison of the system of on-frequency offset value with MIMO that applies fruit 2, 4 and 6 kHz, a frequency of 2 kHz offset produces the most good. On the calculation of the 5 Eb N0 BPSK modulation with dB on the value of the offset frequency of 2 kHz getting the value of the Bit Error Rate 0.0037, for the value of the frequency offset 4 kHz in modulation BPSK BER 0.0058 and get value for value frequency offset of 6 kHz on modulation BPSK get the value of the BER of 0.0114.
Highlights
One of the techniques that are used to define the multipath fading it can make is Ortoghonal Frequency Division Multiplexing (OFDM)
This research aims to find out the influence of frequency on the system on-MIMO offset
On the calculation of the 5 Eb N0 Binary Phase Shift Keying (BPSK) modulation with dB on the value of the offset frequency of 2 kHz getting the value of the Bit Error Rate 0.0037, for the value of the frequency offset 4 kHz in modulation BPSK BER 0.0058 and get value for value frequency offset of 6 kHz on modulation BPSK get the value of the BER of 0.0114
Summary
Perkembangan teknologi komunikasi wireless saat ini mengaharuskan akses yang berkecepatan tinggi dengan kualitas sinyal yang baik serta tahan terhadap gangguan dan interferensi. Sistem OFDM adalah teknik multicarrier yang memiliki frekuensi orthogonal satu sama lain dengan menggunakan bandwidth yang sempit [1]. Frequency offset akan menyebabkan terjadinya intercarrier interference (ICI) dan menurunkan kinerja dari sistem. Proses yang dilakukan dengan teknik modulasi multicarrier, yang membedakan adalah penggunaan sub pembawa yang saling othogonal pada masing-masing subkanal. Sehingga pada penelitian ini menerapkan teknik MIMO STBC2x2 tersebut diharapkan mampu untuk mengetahui penyebab terjadinya ICI pada kanal mobile [2]. Sistem OFDM dapat membuat frekuensi setiap subcarrrier saling orthogonal satu sama lain dimana setiap frekuensi saling overlap tanpa rentan terhadap ISI dengan cara menambahkan guard interval pada setiap frekuensi subcarrier [3]. Proses yang dilakukan sama dengan teknik modulasi multicarrier, yang membedakan hanya pada penggunaan subcarrier yang saling orthogonal pada masing-masing subkanal. Pada Binary Phase Shift Keying (BPSK), phasa dari frekuensi sinyal pembawa diubah-ubah dengan dua nilai yang menyatakan keadaan biner 1 dan 0.
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