The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
Copyrights notice
The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Dalam sistem OFDM tanpa wayar, prestasi sistem mengalami pengimbangan frekuensi dan pengimbangan pemasaan simbol disebabkan oleh kesan Doppler. Menggunakan transformasi Fourier diskret (DFT) dan transformasi Fourier diskret songsang (IDFT) untuk transformasi isyarat tradisional daripada domain masa kepada domain frekuensi, dan sebaliknya, prestasi sistem mungkin merosot dengan teruk. Untuk menjadikan sistem OFDM yang boleh bertolak ansur dengan masalah di atas, kami telah menganggap bahawa transformasi harmonik boleh digunakan untuk transformasi isyarat tradisional, dengan itu meningkatkan prestasi sistem. Dalam makalah ini, kami menggabungkan ciri-ciri baik transformasi harmonik dan frekuensi serta-merta untuk menjadi transformasi baru untuk sistem OFDM tanpa wayar. Kami mencadangkan transformasi harmonik diskret (MDHT) yang diubah suai yang boleh dilakukan secara adaptif. Skim cadangan kami dipanggil OFDM transformasi harmonik diskret yang diubah suai (skim MDHT-OFDM). Kami memperoleh persamaan transformasi harmonik diskret novel yang sesuai untuk sistem OFDM tanpa wayar dan anggaran saluran novel bekerjasama dengan transformasi novel. Anggaran saluran yang dicadangkan dilakukan dalam domain masa dan domain frekuensi. Prestasi skim MDHT-OFDM dinilai melalui simulasi. Kami membandingkan prestasi skim MDHT-OFDM dengan salah satu skema DFT-OFDM konvensional dalam istilah kadar ralat simbol (SER). Skim MDHT-OFDM boleh mencapai prestasi yang lebih baik daripada skim DFT-OFDM konvensional dalam mengurangkan penyebaran Doppler.
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Salinan
Saiyan SAIYOD, Sakchai THIPCHAKSURAT, Ruttikorn VARAKULSIRIPUNTH, "Doppler Spread Mitigation Using Harmonic Transform for Wireless OFDM Systems in Mobile Communications" in IEICE TRANSACTIONS on Fundamentals,
vol. E93-A, no. 12, pp. 2634-2645, December 2010, doi: 10.1587/transfun.E93.A.2634.
Abstract: In wireless OFDM systems, the system performance is suffered from frequency offset and symbol timing offset due to the Doppler effect. Using the discrete Fourier transform (DFT) and inverse discrete Fourier transform (IDFT) for traditional signal transformation from the time-domain into frequency-domain, and vice versa, the system performance may be severely degraded. To make the OFDM system that can tolerate the above problems, we have considered that the harmonic transform can be applicable to the traditional signal transformation, thereby improving the system performance. In this paper, we combine the good characteristics of harmonic transform and instantaneous frequency to be a novel transformation for wireless OFDM systems. We propose a modified discrete harmonic transform (MDHT) which can be performed adaptively. Our proposed scheme called the modified discrete harmonic transform OFDM (MDHT-OFDM scheme). We derive the equations of the novel discrete harmonic transform which are suitable for wireless OFDM systems and the novel channel estimation cooperated with the novel transformation. The proposed channel estimation is performed in both time-domain and frequency-domain. The performance of a MDHT-OFDM scheme is evaluated by means of a simulation. We compare the performance of a MDHT-OFDM scheme with one of the conventional DFT-OFDM scheme in the term of symbol error rate (SER). MDHT-OFDM scheme can achieve better performance than that of the conventional DFT-OFDM scheme in mitigating the Doppler spread.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/transfun.E93.A.2634/_p
Salinan
@ARTICLE{e93-a_12_2634,
author={Saiyan SAIYOD, Sakchai THIPCHAKSURAT, Ruttikorn VARAKULSIRIPUNTH, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Doppler Spread Mitigation Using Harmonic Transform for Wireless OFDM Systems in Mobile Communications},
year={2010},
volume={E93-A},
number={12},
pages={2634-2645},
abstract={In wireless OFDM systems, the system performance is suffered from frequency offset and symbol timing offset due to the Doppler effect. Using the discrete Fourier transform (DFT) and inverse discrete Fourier transform (IDFT) for traditional signal transformation from the time-domain into frequency-domain, and vice versa, the system performance may be severely degraded. To make the OFDM system that can tolerate the above problems, we have considered that the harmonic transform can be applicable to the traditional signal transformation, thereby improving the system performance. In this paper, we combine the good characteristics of harmonic transform and instantaneous frequency to be a novel transformation for wireless OFDM systems. We propose a modified discrete harmonic transform (MDHT) which can be performed adaptively. Our proposed scheme called the modified discrete harmonic transform OFDM (MDHT-OFDM scheme). We derive the equations of the novel discrete harmonic transform which are suitable for wireless OFDM systems and the novel channel estimation cooperated with the novel transformation. The proposed channel estimation is performed in both time-domain and frequency-domain. The performance of a MDHT-OFDM scheme is evaluated by means of a simulation. We compare the performance of a MDHT-OFDM scheme with one of the conventional DFT-OFDM scheme in the term of symbol error rate (SER). MDHT-OFDM scheme can achieve better performance than that of the conventional DFT-OFDM scheme in mitigating the Doppler spread.},
keywords={},
doi={10.1587/transfun.E93.A.2634},
ISSN={1745-1337},
month={December},}
Salinan
TY - JOUR
TI - Doppler Spread Mitigation Using Harmonic Transform for Wireless OFDM Systems in Mobile Communications
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 2634
EP - 2645
AU - Saiyan SAIYOD
AU - Sakchai THIPCHAKSURAT
AU - Ruttikorn VARAKULSIRIPUNTH
PY - 2010
DO - 10.1587/transfun.E93.A.2634
JO - IEICE TRANSACTIONS on Fundamentals
SN - 1745-1337
VL - E93-A
IS - 12
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - December 2010
AB - In wireless OFDM systems, the system performance is suffered from frequency offset and symbol timing offset due to the Doppler effect. Using the discrete Fourier transform (DFT) and inverse discrete Fourier transform (IDFT) for traditional signal transformation from the time-domain into frequency-domain, and vice versa, the system performance may be severely degraded. To make the OFDM system that can tolerate the above problems, we have considered that the harmonic transform can be applicable to the traditional signal transformation, thereby improving the system performance. In this paper, we combine the good characteristics of harmonic transform and instantaneous frequency to be a novel transformation for wireless OFDM systems. We propose a modified discrete harmonic transform (MDHT) which can be performed adaptively. Our proposed scheme called the modified discrete harmonic transform OFDM (MDHT-OFDM scheme). We derive the equations of the novel discrete harmonic transform which are suitable for wireless OFDM systems and the novel channel estimation cooperated with the novel transformation. The proposed channel estimation is performed in both time-domain and frequency-domain. The performance of a MDHT-OFDM scheme is evaluated by means of a simulation. We compare the performance of a MDHT-OFDM scheme with one of the conventional DFT-OFDM scheme in the term of symbol error rate (SER). MDHT-OFDM scheme can achieve better performance than that of the conventional DFT-OFDM scheme in mitigating the Doppler spread.
ER -