Analisa Pengaruh Nonlinear HPA pada Kinerja BER Sistem FBMC/OQAM

Prasetyo, Sofyan Dwi (2021) Analisa Pengaruh Nonlinear HPA pada Kinerja BER Sistem FBMC/OQAM. Masters thesis, Institut Teknologi Sepuluh Nopember.

Text Buku Tesis Sofyan Dwi Prasetyo_NRP.07111950030002.pdf - Accepted Version Restricted to Repository staff only until 1 April 2024. Download (5MB) | Request a copy

Abstract

Filter Bank Multicarrier (FBMC) merupakan salah satu teknik multicarrier yang banyak diteliti karena memiliki keunggulan Peak to Average Power Ratio (PAPR) yang lebih rendah dibandingkan dengan Orthogonal Frequency Division Multiplexing (OFDM). Namun, penggunaan M-ary Offset Quadrature Amplitude Modulation (OQAM) yang memiliki variasi amplitudo yang berbeda antara simbol QAM satu dengan lainnya, menyebabkan PAPR pada FBMC meningkat. Selain itu, FBMC/OQAM memiliki intrinsic interference, sehingga menarik untuk dianalisa mengenai pengaruh distorsi nonlinear pada sistem FBMC/OQAM dengan variasi M-ary dan juga mengamati faktor intrinsic interference terhadap kinerja sistem.
Pada penelitian ini menganalisa pengaruh efek nonlinearitas sistem FBMC/OQAM dibandingkan dengan OFDM/QAM . Dari analisa scatterplot setelah melewati HPA didapatkan bahwa sistem FBMC/OQAM memiliki karakteristik distorsi amplitudo yang lebih menyebar sedangkan sistem OFDM/QAM memiliki karakteristik distorsi phasa yang lebih besar 8.23◦. Selanjutnya pada analisa kinerja Bit Error Rate (BER) sistem nonlinear HPA OFDM-4QAM memiliki kinerja 6dB lebih baik dibandingkan sistem nonlinear HPA FBMC-4OQAM. Pada 16-ary masing-masing sistem sama-sama memiliki kinerja yang buruk dan terjadi error floor pada Eb/No=20dB. Dengan melakukan perbaikan sederhana dengan menggunakan predistorter, didapatkan perbaikan kostelasi pada sistem FBMC/OQAM dan OFDM/QAM . Kemudian didapatkan perbaikan kinerja BER sebesar 18dB untuk sistem FBMC-4OQAM dan 12dB untuk OFDM-4QAM. Ini menunjukkan bahwa perbaikan dengan predistorter lebih cocok untuk sistem FBMC/OQAM dibandingkan OFDM/QAM.
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Filter Bank Multicarrier (FBMC) is one of the most studied multicarrier techniques because it has the advantage of a Peak to Average Power Ratio (PAPR) which is lower than Orthogonal Frequency Division Multiplexing (OFDM). However, the use of M-ary Offset Quadrature Amplitude Modulation (OQAM) which has different amplitude variations from one QAM symbol to another, causes PAPR in FBMC to increase. In addition, FBMC/OQAM has intrinsic interference, so it is interesting to analyze the effect of nonlinear distortion on the FBMC/OQAM system with M-ary variations and also observe the intrinsic interference factor on system performance.
This study analyzes the effect of the nonlinearity of the FBMC/OQAM system compared to OFDM/QAM . From the scatterplot analysis after passing through the HPA, it was found that the FBMC/OQAM system has a more diffuse amplitude distortion characteristic, while the OFDM/QAM system has a larger phase distortion characteristic of 8.23◦. Furthermore, in the analysis of the Bit Error Rate (BER) performance, the HPA OFDM-4QAM nonlinear system has 6dB better performance than the nonlinear HPA FBMC-4OQAM system. On the 16-ary each system has the same bad performance and there is an error floor at Eb/No=20dB. By doing a simple repair using a predistorter, we get a costal improvement on the FBMC/OQAM and OFDM/QAM systems. Then, the BER performance improvement was 18dB for the FBMC-4OQAM system and 12dB for the OFDM-4QAM system. This indicates that the repair with the predistorter is more suitable for the FBMC/OQAM system than the OFDM/QAM.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	FBMC,OQAM, Distorsi nonlinear,PAPR ,BER, FBMC, OQAM, Nonlinear Distortion, PAPR, BER
Subjects:	T Technology > T Technology (General) > T57.62 Simulation T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5102.9 Signal processing. T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5103.2 Wireless communication systems. Two way wireless communication T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101 Telecommunication
Divisions:	Faculty of Intelligent Electrical and Informatics Technology (ELECTICS) > Electrical Engineering > 20101-(S2) Master Thesis
Depositing User:	Sofyan Dwi Prasetyo
Date Deposited:	02 Feb 2022 01:12
Last Modified:	02 Feb 2022 01:12
URI:	http://repository.its.ac.id/id/eprint/92601

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