Analisis Teknik DFT-Spread Untuk Mitigasi Efek Non-Linier HPA Pada Sistem FBMC/OQAM

Arifin, Mohamad (2024) Analisis Teknik DFT-Spread Untuk Mitigasi Efek Non-Linier HPA Pada Sistem FBMC/OQAM. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Filter Bank Multi Carrier dengan Offset Quadrature Amplitude Modulation (FBMC/OQAM) memiliki radiasi Out-of-Band (OOB) yang lebih rendah dari Orthogonal Frequency Division Multiplexing (OFDM). Hal ini dikarenakan pada FBMC/OQAM menggunakan prototype filter sebagai pulse shaping filter. Namun sama halnya dengan sistem OFDM, nilai Peak Average-to-Power Ratio (PAPR) pada FBMC/OQAM juga tinggi. Pada Non-linier High Power Amplifier (HPA), sinyal dengan PAPR yang tinggi akan menyebabkan peningkatan radiasi OOB pada sinyal output HPA dan penurunan performa Bit Error Ratio (BER) pada penerima. Teknik Discrete Fourier Transform – Spreading (DFT-Spread) merupakan teknik reduksi PAPR yang banyak diterapkan pada sistem modulasi multicarrier. Pada penelitian ini, kami menganalisis kinerja dari teknik DFT-Spread untuk mitigasi efek Non-Linier HPA pada sistem FBMC/OQAM. Teknik DFT-Spread yang diterapkan adalah dengan menambahkan proses DFT dan Subcarrier Mapping Pada sisi pemancar. Pada penerima juga ditambahkan proses Subcarrier De-mapping dan IDFT.
Pada pengujian PAPR FBMC, teknik DFT-Spread desain 1 untuk semua mode subcarrier mapping menghasilkan reduksi PAPR yang sama yaitu sebesar 1,85 dB pada FBMC/16-OQAM dan 1,8 dB pada FBMC/64-OQAM. Pada pengujian PAPR FBMC, teknik DFT-Spread desain 2 dengan mode subcarrier mapping LFDMA mereduksi PAPR paling baik sebesar 2,45 dB pada FBMC/16-OQAM dan 2,5 dB pada FBMC/64-OQAM. Pada pengujian BER FBMC/16-OQAM dengan non-linier HPA (IBO = -20 dB), teknik DFT-Spread Desain 1 dapat memperbaiki performa BER. Pada BER 10-4, teknik DFT-Spread desain 1 dengan subcarrier mapping mode Interleaved (IFDMA) dan Distributed (DFDMA) dapat mengurangi Eb/No sebesar 1,5 dB. Pada kondisi pengujian yang sama, teknik DFT-Spread Desain 2 dapat juga memperbaiki performa BER. Pada BER 10-4, teknik DFT-Spread desain 2 dengan subcarrier mapping mode Interleaved (IFDMA) dan Distributed (DFDMA) dapat mengurangi Eb/No sebesar 2 dB.
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Filter Bank Multi Carrier with Offset Quadrature Amplitude Modulation (FBMC/OQAM) exhibits lower Out-of-Band (OOB) radiation compared to Orthogonal Frequency Division Multiplexing (OFDM) due to the use of a prototype filter as a pulse shaping filter. However, similar to OFDM systems, the Peak Average-to-Power Ratio (PAPR) in FBMC/OQAM is also high. In Nonlinear High Power Amplifier (HPA), signals with high PAPR can lead to increased OOB radiation in the HPA output signal and a decrease in Bit Error Ratio (BER) performance at the receiver. The Discrete Fourier Transform – Spreading (DFT-Spread) technique is a widely applied PAPR reduction technique in multicarrier modulation systems. In this research, we analyze the performance of the DFT-Spread technique for mitigating the Nonlinear HPA effects in the FBMC/OQAM system. The applied DFT-Spread technique involves adding DFT and Subcarrier Mapping processes at the transmitter side, and Subcarrier Demapping and IDFT processes at the receiver side.
In the FBMC PAPR test, the DFT-Spread design 1 technique for all subcarrier mapping modes produces the same PAPR reduction of 1.85 dB on FBMC/16-OQAM and 1.8 dB on FBMC/64-OQAM. In the FBMC PAPR test, the DFT-Spread design 2 technique with LFDMA subcarrier mapping mode reduced the best PAPR by 2.45 dB on FBMC/16-OQAM and 2.5 dB on FBMC/64-OQAM. In FBMC/16-OQAM BER testing with nonlinear HPA (IBO = -20 dB), the DFT-Spread Design 1 technique can improve BER performance. At BER 10-4, the DFT-Spread technique design 1 with Interleaved (IFDMA) and Distributed mode (DFDMA) subcarrier mapping can reduce Eb/No by 1.5 dB. Under the same test conditions, the DFT-Spread Design 2 technique can also improve BER performance. At BER 10-4, the DFT-Spread design 2 technique with Interleaved (IFDMA) and Distributed mode (DFDMA) subcarrier mapping can reduce Eb/No by 2 dB.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	FBMC/OQAM, PAPR, Non-Linier HPA, DFT-Spread, Subcarrier Mapping, FBMC/OQAM, PAPR, Nonlinear HPA, DFT-Spread, Subcarrier Mapping
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5102.9 Signal processing. T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5103.484 Orthogonal frequency division multiplexing. 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:	Mohamad Arifin
Date Deposited:	06 Feb 2024 06:25
Last Modified:	06 Feb 2024 06:25
URI:	http://repository.its.ac.id/id/eprint/106273

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