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 mencadangkan sistem DS/CDMA baru dengan teknik kepelbagaian kod yang dibentuk oleh sistem mudah untuk menyekat gangguan akses berbilang (MAI) tanpa menganggarkan jujukan gangguan PN pada penerima. Dalam pemancar, isyarat data dimodulasi dengan jumlah beberapa jujukan PN, dan, dua jenis penerimaan kepelbagaian kod dicadangkan, (1) kepelbagaian kod gabungan nisbah maksimum (MRC) secara autokorelasi, dan (2) MRC kepelbagaian kod dengan anti-silang korelasi. Melalui simulasi komputer, ditunjukkan bahawa kepelbagaian kod BSMM oleh anti-silang korelasi adalah lebih baik daripada yang lain. Ia juga menunjukkan bahawa kepelbagaian kod BSMM oleh anti-silang korelasi boleh meningkatkan BER dengan lebih berkesan untuk gangguan yang mengambil fasa untuk merendahkan BER pada tahap yang paling teruk. Seterusnya, untuk mereka bentuk bilangan cawangan optimum bagi kepelbagaian kod, BER purata dikira untuk beberapa kombinasi kod dalam kepelbagaian kod. Akibatnya, bilangan cawangan optimum berbeza-beza untuk setiap gabungan kod, bagaimanapun, ia diputuskan daripada 3 hingga 7 cawangan. Akhir sekali, keberkesanan sistem yang dicadangkan dalam masalah hampir jauh dibentangkan.
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Salinan
Tetsuya SEKI, Masanori HAMAMURA, Shin'ichi TACHIKAWA, "Suppression Effects of Multiple Access Interference in DS/CDMA with Code-Diversity" in IEICE TRANSACTIONS on Fundamentals,
vol. E82-A, no. 12, pp. 2720-2727, December 1999, doi: .
Abstract: This paper proposes a novel DS/CDMA system with code-diversity techniques constituted by a simple system to suppress multiple access interference (MAI) without estimating the PN sequence of interference at the receiver. In the transmitter, the data signal is modulated with a sum of several PN sequences, and, two types of code- diversity reception are proposed, (1) maximal-ratio combining (MRC) code-diversity by autocorrelation, and (2) MRC code-diversity by anti-crosscorrelation. By computer simulations, it is shown that MRC code-diversity by anti-crosscorrelation is superior to the other one. It is also shown that MRC code-diversity by anti-crosscorrelation can improve BER more effectively for the interference which takes the phase to degrade BER at the worst. Next, to design the optimum number of branches for code-diversity, average BERs are calculated for several combinations of codes in code-diversity. As a result, the optimum number of branches varies for each combination of codes, however, it is decided from 3 to 7 branches. Finally, the effectivity of the proposed system in a near-far problem is presented.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/e82-a_12_2720/_p
Salinan
@ARTICLE{e82-a_12_2720,
author={Tetsuya SEKI, Masanori HAMAMURA, Shin'ichi TACHIKAWA, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Suppression Effects of Multiple Access Interference in DS/CDMA with Code-Diversity},
year={1999},
volume={E82-A},
number={12},
pages={2720-2727},
abstract={This paper proposes a novel DS/CDMA system with code-diversity techniques constituted by a simple system to suppress multiple access interference (MAI) without estimating the PN sequence of interference at the receiver. In the transmitter, the data signal is modulated with a sum of several PN sequences, and, two types of code- diversity reception are proposed, (1) maximal-ratio combining (MRC) code-diversity by autocorrelation, and (2) MRC code-diversity by anti-crosscorrelation. By computer simulations, it is shown that MRC code-diversity by anti-crosscorrelation is superior to the other one. It is also shown that MRC code-diversity by anti-crosscorrelation can improve BER more effectively for the interference which takes the phase to degrade BER at the worst. Next, to design the optimum number of branches for code-diversity, average BERs are calculated for several combinations of codes in code-diversity. As a result, the optimum number of branches varies for each combination of codes, however, it is decided from 3 to 7 branches. Finally, the effectivity of the proposed system in a near-far problem is presented.},
keywords={},
doi={},
ISSN={},
month={December},}
Salinan
TY - JOUR
TI - Suppression Effects of Multiple Access Interference in DS/CDMA with Code-Diversity
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 2720
EP - 2727
AU - Tetsuya SEKI
AU - Masanori HAMAMURA
AU - Shin'ichi TACHIKAWA
PY - 1999
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E82-A
IS - 12
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - December 1999
AB - This paper proposes a novel DS/CDMA system with code-diversity techniques constituted by a simple system to suppress multiple access interference (MAI) without estimating the PN sequence of interference at the receiver. In the transmitter, the data signal is modulated with a sum of several PN sequences, and, two types of code- diversity reception are proposed, (1) maximal-ratio combining (MRC) code-diversity by autocorrelation, and (2) MRC code-diversity by anti-crosscorrelation. By computer simulations, it is shown that MRC code-diversity by anti-crosscorrelation is superior to the other one. It is also shown that MRC code-diversity by anti-crosscorrelation can improve BER more effectively for the interference which takes the phase to degrade BER at the worst. Next, to design the optimum number of branches for code-diversity, average BERs are calculated for several combinations of codes in code-diversity. As a result, the optimum number of branches varies for each combination of codes, however, it is decided from 3 to 7 branches. Finally, the effectivity of the proposed system in a near-far problem is presented.
ER -