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
Akses berbilang bukan ortogonal (NOMA), yang menggabungkan berbilang isyarat pengguna dan menghantar isyarat gabungan ke atas satu saluran, boleh mencapai kecekapan spektrum tinggi untuk komunikasi mudah alih. Walau bagaimanapun, menggabungkan berbilang isyarat boleh membawa kepada penurunan kadar ralat bit (BER) NOMA di bawah keadaan saluran yang teruk. Untuk meningkatkan prestasi BER NOMA, kertas kerja ini mencadangkan skim NOMA baharu berdasarkan kod blok ruang-masa ortogon (OSTBC). Skim yang dicadangkan menghantar beberapa isyarat bermultipleks melalui saluran frekuensi masa ortogon masing-masing, dan boleh mendapat kesan kepelbagaian disebabkan oleh keortogonan OSTBC. Tambahan pula, skim baharu ini boleh mengesan isyarat pengguna menggunakan pengesanan linear kerumitan rendah berbeza dengan NOMA konvensional. Makalah ini memfokuskan pada kod Alamouti, yang boleh dianggap sebagai OSTBC paling mudah, dan secara teorinya menganalisis prestasi pengesanan linear. Simulasi komputer di bawah keadaan kadar bit yang sama setiap saluran menunjukkan bahawa skema berasaskan kod Alamouti menggunakan dua saluran adalah lebih baik daripada NOMA konvensional menggunakan satu saluran dari segi prestasi BER. Seperti yang ditunjukkan oleh kedua-dua analisis teori dan simulasi, pengesanan linear untuk skema yang dicadangkan boleh mengekalkan prestasi BER yang sama seperti pengesanan kemungkinan maksimum, apabila kedua-dua saluran mempunyai tindak balas frekuensi yang sama dan tidak membawa sebarang kesan kepelbagaian, yang boleh dianggap sebagai kes terburuk.
Yuyuan CHANG
Tokyo Institute of Technology
Kazuhiko FUKAWA
Tokyo Institute of Technology
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Salinan
Yuyuan CHANG, Kazuhiko FUKAWA, "Non-Orthogonal Multiple Access Based on Orthogonal Space-Time Block Codes for Mobile Communications" in IEICE TRANSACTIONS on Communications,
vol. E106-B, no. 10, pp. 1024-1033, October 2023, doi: 10.1587/transcom.2022EBP3166.
Abstract: Non-orthogonal multiple access (NOMA), which combines multiple user signals and transmits the combined signal over one channel, can achieve high spectral efficiency for mobile communications. However, combining the multiple signals can lead to degradation of bit error rates (BERs) of NOMA under severe channel conditions. In order to improve the BER performance of NOMA, this paper proposes a new NOMA scheme based on orthogonal space-time block codes (OSTBCs). The proposed scheme transmits several multiplexed signals over their respective orthogonal time-frequency channels, and can gain diversity effects due to the orthogonality of OSTBC. Furthermore, the new scheme can detect the user signals using low-complexity linear detection in contrast with the conventional NOMA. The paper focuses on the Alamouti code, which can be considered the simplest OSTBC, and theoretically analyzes the performance of the linear detection. Computer simulations under the condition of the same bit rate per channel show that the Alamouti code based scheme using two channels is superior to the conventional NOMA using one channel in terms of BER performance. As shown by both the theoretical and simulation analyses, the linear detection for the proposed scheme can maintain the same BER performance as that of the maximum likelihood detection, when the two channels have the same frequency response and do not bring about any diversity effects, which can be regarded as the worst case.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.2022EBP3166/_p
Salinan
@ARTICLE{e106-b_10_1024,
author={Yuyuan CHANG, Kazuhiko FUKAWA, },
journal={IEICE TRANSACTIONS on Communications},
title={Non-Orthogonal Multiple Access Based on Orthogonal Space-Time Block Codes for Mobile Communications},
year={2023},
volume={E106-B},
number={10},
pages={1024-1033},
abstract={Non-orthogonal multiple access (NOMA), which combines multiple user signals and transmits the combined signal over one channel, can achieve high spectral efficiency for mobile communications. However, combining the multiple signals can lead to degradation of bit error rates (BERs) of NOMA under severe channel conditions. In order to improve the BER performance of NOMA, this paper proposes a new NOMA scheme based on orthogonal space-time block codes (OSTBCs). The proposed scheme transmits several multiplexed signals over their respective orthogonal time-frequency channels, and can gain diversity effects due to the orthogonality of OSTBC. Furthermore, the new scheme can detect the user signals using low-complexity linear detection in contrast with the conventional NOMA. The paper focuses on the Alamouti code, which can be considered the simplest OSTBC, and theoretically analyzes the performance of the linear detection. Computer simulations under the condition of the same bit rate per channel show that the Alamouti code based scheme using two channels is superior to the conventional NOMA using one channel in terms of BER performance. As shown by both the theoretical and simulation analyses, the linear detection for the proposed scheme can maintain the same BER performance as that of the maximum likelihood detection, when the two channels have the same frequency response and do not bring about any diversity effects, which can be regarded as the worst case.},
keywords={},
doi={10.1587/transcom.2022EBP3166},
ISSN={1745-1345},
month={October},}
Salinan
TY - JOUR
TI - Non-Orthogonal Multiple Access Based on Orthogonal Space-Time Block Codes for Mobile Communications
T2 - IEICE TRANSACTIONS on Communications
SP - 1024
EP - 1033
AU - Yuyuan CHANG
AU - Kazuhiko FUKAWA
PY - 2023
DO - 10.1587/transcom.2022EBP3166
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E106-B
IS - 10
JA - IEICE TRANSACTIONS on Communications
Y1 - October 2023
AB - Non-orthogonal multiple access (NOMA), which combines multiple user signals and transmits the combined signal over one channel, can achieve high spectral efficiency for mobile communications. However, combining the multiple signals can lead to degradation of bit error rates (BERs) of NOMA under severe channel conditions. In order to improve the BER performance of NOMA, this paper proposes a new NOMA scheme based on orthogonal space-time block codes (OSTBCs). The proposed scheme transmits several multiplexed signals over their respective orthogonal time-frequency channels, and can gain diversity effects due to the orthogonality of OSTBC. Furthermore, the new scheme can detect the user signals using low-complexity linear detection in contrast with the conventional NOMA. The paper focuses on the Alamouti code, which can be considered the simplest OSTBC, and theoretically analyzes the performance of the linear detection. Computer simulations under the condition of the same bit rate per channel show that the Alamouti code based scheme using two channels is superior to the conventional NOMA using one channel in terms of BER performance. As shown by both the theoretical and simulation analyses, the linear detection for the proposed scheme can maintain the same BER performance as that of the maximum likelihood detection, when the two channels have the same frequency response and do not bring about any diversity effects, which can be regarded as the worst case.
ER -