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Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

1300-1884 1304-4915

Gazi Üniversitesi

10.17341/gazimmfd.1142173

Engineering

Mühendislik

Sıralı LLWT-PTS-AC yöntemi ile klasik OFDM dalga formunun BER ve PAPR performanslarının iyileştirilmesi

Improving the BER and PAPR performances of conventional OFDM waveform with sequential LLWT-PTS-AC method

https://orcid.org/0000-0002-9017-7672

Tengizler

Bekir

NUH NACI YAZGAN UNIVERSITY

https://orcid.org/0000-0002-2506-5690

Çalışkan

Efe Kaan

NUH NACI YAZGAN UNIVERSITY

https://orcid.org/0000-0003-2831-5058

Gülbaz

Alihan

NUH NACI YAZGAN UNIVERSITY

https://orcid.org/0000-0003-3232-3181

Özen

Ali

NUH NACI YAZGAN UNIVERSITY, FACULTY OF ENGINEERING

05 20 2024

39 3 1837 1848 07 07 2022 09 10 2023

1986

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

Çok taşıyıcılı (MC) telsiz iletişim sistemlerinin en büyük dezavantajlarından birisi yüksek tepe-ortalama güç oranı (PAPR)’dır. Pek çok standartta kabul edilen dikgen frekans bölmeli çoğullama (OFDM) sistemi de bu dezavantajdan etkilenmektedir. Araştırma literatüründe MC telsiz iletişim sistemlerinin yüksek PAPR seviyelerini azaltmak için genlik kırpma (AC) ve filtreleme, kodlama, serpiştirme, ton rezervasyonu (TR), ton ekleme (TI), kısmi iletim dizisi (PTS) ve seçilmiş haritalama (SLM) teknikleri gibi pek çok yöntem sunulmuştur. Bunlara ek olarak, bu PAPR azaltma yöntemlerini kullanan MC telsiz iletişim sistemlerinin diğer performanslarının iyileştirilmesi amacıyla sistemlere uygulanan hızlı Walsh Hadamard dönüşümü (FWHT) ve ayrık dalgacık dönüşümü (DWT) gibi dönüşümlerde sunulmuştur. Bu çalışmada, MC telsiz iletişim sistemlerinin hem bit hata oranı (BER) performansını hem de PAPR başarımını iyileştirmek için PTS ve AC tekniği ile Lazy dalgacığını kullanan Lifting dalgacık dönüşümünün (LLWT) birleştirilmesi önerilmektedir. Bu makalede, ilk defa bu çalışmada önerilen PTS ve AC tekniği ile LLWT dönüşümünün birleşimi olan LLWT-PTS-AC yöntemi, MC telsiz iletişim sistemlerinin dezavantajlarını ortadan kaldırmak için klasik OFDM dalga formuna uygulanmıştır ve kayda değer sonuçlar elde edilmiştir. Sonuçlar incelendiği zaman, klasik OFDM sisteminin PAPR ve BER başarımlarının tatmin edici ölçüde arttığı görülmektedir.

One of the major disadvantages of multi-carrier (MC) radio communication systems is the high peak-to-average power ratio (PAPR). Orthogonal frequency division multiplexing (OFDM) system, which is accepted by many standards, is also affected by this disadvantage. In the research literature, many methods, such as amplitude clipping (AC) and filtering, coding, interleaving, tone reservation (TR), tone addition (TI), partial transmit sequence (PTS) and selected mapping (SLM) methods, have been presented to decrease the high PAPR values of MC radio communication systems. In addition, transformations such as fast Walsh Hadamard transform (FWHT) and discrete wavelet transform (DWT) applied to systems are proposed in order to increase other performances of MC radio communication systems using these PAPR reduction methods. In this study, it is suggested to combine PTS and AC technique with Lifting wavelet transform (LLWT) using Lazy wavelet to improve both bit error rate (BER) performance and PAPR performance of MC wireless communication systems. In this article, the LLWT-PTS-AC method, which is the combination of PTS and AC technique with LLWT conversion, which is proposed in this study for the first time, has been applied to the classical OFDM waveform to eliminate the disadvantages of MC radio communication systems, and remarkable results have been obtained. When the results are examined, it is seen that the PAPR and BER performances of the classical OFDM system have increased satisfactorily.

OFDM dalga formu PAPR azaltma Lifting dalgacık dönüşümü PTS LLWT-PTS-AC

OFDM waveform PAPR reduction Lifting wavelet transform PTS LLWT-PTS-AC

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