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
Makalah ini membentangkan skim pembatalan gangguan (IC) baru untuk saluran wayarles berbilang akses (DS-CDMA) jujukan langsung jujukan langsung dan tak segerak. Dalam sistem DS-CDMA, gangguan capaian berbilang (MAI) dan masalah hampir jauh (NFP) adalah dua faktor yang mengurangkan kapasiti sistem. Dalam kertas ini, kami mencadangkan algoritma baharu yang mampu mengesan semua isyarat gangguan sebagai isyarat MAI individu dengan pengesanan korelasi maksimum. Ia berdasarkan penemuan semua kod penyebaran isyarat gangguan yang tidak diketahui. Kemudian, semua corak MAI yang mungkin dipanggil replika dijana sebagai penjumlahan isyarat gangguan. Dan corak MAI sebenar ditemui dengan mengambil korelasi antara isyarat yang diterima dan replika. Selain itu, penerima melaksanakan pembatalan MAI secara berturut-turut, mengalih keluar semua isyarat gangguan mengikut satu peringkat. Keputusan berangka akan menunjukkan bahawa strategi IC yang dicadangkan, yang mengurangkan kesan buruk MAI dan masalah hampir jauh, boleh meningkatkan prestasi sistem dengan ketara. Terutamanya, kita boleh memperoleh ciri-ciri penerimaan yang hampir sama seperti jika tiada gangguan untuk sistem tak segerak apabila kuasa yang diterima adalah sama. Selain itu, prestasi yang sama boleh dilihat di bawah mana-mana keadaan kuasa yang diterima untuk sistem segerak.
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Salinan
Ranga HETTIARACHCHI, Mitsuo YOKOYAMA, Hideyuki UEHARA, "Interference Cancellation Technique Based on Discovery of Spreading Codes of Interference Signals and Maximum Correlation Detection for DS-CDMA System" in IEICE TRANSACTIONS on Fundamentals,
vol. E91-A, no. 11, pp. 3335-3345, November 2008, doi: 10.1093/ietfec/e91-a.11.3335.
Abstract: This paper presents a novel interference cancellation (IC) scheme for both synchronous and asynchronous direct-sequence code-division multiple-access (DS-CDMA) wireless channels. In the DS-CDMA system, the multiple access interference (MAI) and the near-far problem (NFP) are the two factors which reduce the capacity of the system. In this paper, we propose a new algorithm that is able to detect all interference signals as an individual MAI signal by maximum correlation detection. It is based on the discovery of all the unknowing spreading codes of the interference signals. Then, all possible MAI patterns so called replicas are generated as a summation of interference signals. And the true MAI pattern is found by taking correlation between the received signal and the replicas. Moreover, the receiver executes MAI cancellation in a successive manner, removing all interference signals by single-stage. Numerical results will show that the proposed IC strategy, which alleviates the detrimental effect of the MAI and the near-far problem, can significantly improve the system performance. Especially, we can obtain almost the same receiving characteristics as in the absense of interference for asynchrnous system when received powers are equal. Also, the same performances can be seen under any received power state for synchronous system.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1093/ietfec/e91-a.11.3335/_p
Salinan
@ARTICLE{e91-a_11_3335,
author={Ranga HETTIARACHCHI, Mitsuo YOKOYAMA, Hideyuki UEHARA, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Interference Cancellation Technique Based on Discovery of Spreading Codes of Interference Signals and Maximum Correlation Detection for DS-CDMA System},
year={2008},
volume={E91-A},
number={11},
pages={3335-3345},
abstract={This paper presents a novel interference cancellation (IC) scheme for both synchronous and asynchronous direct-sequence code-division multiple-access (DS-CDMA) wireless channels. In the DS-CDMA system, the multiple access interference (MAI) and the near-far problem (NFP) are the two factors which reduce the capacity of the system. In this paper, we propose a new algorithm that is able to detect all interference signals as an individual MAI signal by maximum correlation detection. It is based on the discovery of all the unknowing spreading codes of the interference signals. Then, all possible MAI patterns so called replicas are generated as a summation of interference signals. And the true MAI pattern is found by taking correlation between the received signal and the replicas. Moreover, the receiver executes MAI cancellation in a successive manner, removing all interference signals by single-stage. Numerical results will show that the proposed IC strategy, which alleviates the detrimental effect of the MAI and the near-far problem, can significantly improve the system performance. Especially, we can obtain almost the same receiving characteristics as in the absense of interference for asynchrnous system when received powers are equal. Also, the same performances can be seen under any received power state for synchronous system.},
keywords={},
doi={10.1093/ietfec/e91-a.11.3335},
ISSN={1745-1337},
month={November},}
Salinan
TY - JOUR
TI - Interference Cancellation Technique Based on Discovery of Spreading Codes of Interference Signals and Maximum Correlation Detection for DS-CDMA System
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 3335
EP - 3345
AU - Ranga HETTIARACHCHI
AU - Mitsuo YOKOYAMA
AU - Hideyuki UEHARA
PY - 2008
DO - 10.1093/ietfec/e91-a.11.3335
JO - IEICE TRANSACTIONS on Fundamentals
SN - 1745-1337
VL - E91-A
IS - 11
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - November 2008
AB - This paper presents a novel interference cancellation (IC) scheme for both synchronous and asynchronous direct-sequence code-division multiple-access (DS-CDMA) wireless channels. In the DS-CDMA system, the multiple access interference (MAI) and the near-far problem (NFP) are the two factors which reduce the capacity of the system. In this paper, we propose a new algorithm that is able to detect all interference signals as an individual MAI signal by maximum correlation detection. It is based on the discovery of all the unknowing spreading codes of the interference signals. Then, all possible MAI patterns so called replicas are generated as a summation of interference signals. And the true MAI pattern is found by taking correlation between the received signal and the replicas. Moreover, the receiver executes MAI cancellation in a successive manner, removing all interference signals by single-stage. Numerical results will show that the proposed IC strategy, which alleviates the detrimental effect of the MAI and the near-far problem, can significantly improve the system performance. Especially, we can obtain almost the same receiving characteristics as in the absense of interference for asynchrnous system when received powers are equal. Also, the same performances can be seen under any received power state for synchronous system.
ER -