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
Pembatalan gangguan berbilang pengguna konvensional sentiasa dilakukan dalam pautan atas. Dalam makalah ini, skim pembatalan gangguan berbilang pengguna baru diperkenalkan. Ia boleh digunakan dalam pautan ke bawah sistem TDD-CDMA. Pembatalan gangguan berbilang pengguna dilakukan melalui pengoptimuman bersama kedua-dua bentuk gelombang penyebaran dan penyebaran untuk pengguna yang berbeza, bukannya kod penyebaran sahaja. Ideanya adalah untuk mengambil kelebihan eksploitasi, dan bukannya pengurangan, daripada kesan penyebaran berbilang laluan. Dalam sistem TDD-CDMA, parameter saluran pautan bawah boleh dianggarkan daripada pautan atas. Kita boleh mengira kod penyebaran dan penyebaran dengan menggunakan parameter saluran serta-merta, supaya ia boleh menampung ciri saluran berbilang laluan. Kriteria isyarat terima maksimum kepada gangguan ditambah catuan hingar (SINR) digunakan untuk mengoptimumkan kod penyebaran dan penyebaran. Algoritma lelaran diberikan untuk mencipta kod penyebaran dan penyebaran yang optimum. Keputusan berangka menunjukkan bahawa skim kami boleh mengurangkan gangguan berbilang capaian (MAI), dengan itu meningkatkan SINR, berbanding dengan kod penyebaran konvensional seperti kod Emas. Keputusan berangka skim yang dicadangkan dengan mengandaikan bilangan pengguna aktif yang berbeza, kekerapan Doppler dan ralat anggaran pekali juga diberikan.
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Salinan
Ji-Bing WANG, Ming ZHAO, Shi-Dong ZHOU, Yan YAO, "Optimal Sequences to Suppress the Multiuser Interference in the Downlink of the TDD-CDMA Systems" in IEICE TRANSACTIONS on Communications,
vol. E83-B, no. 8, pp. 1649-1655, August 2000, doi: .
Abstract: Conventional multiuser interference canceling is always done in the uplink. In this paper, a novel multiuser interference canceling scheme is introduced. It can be used in the downlink of the TDD-CDMA systems. The multiuser interference canceling is done through the joint optimization of both the spreading and despreading waveform for different users, instead of the despreading code only. The idea is to take the advantages of exploitation, rather than mitigation, of the multipath propagation effects. In TDD-CDMA systems, the channel parameter of the downlink can be estimated from the uplink. We can calculate the spreading and despreading code by using the instantaneous channel parameters, so they can accommodate to the characteristic of the multipath channel. The maximum receive signal to interference plus noise ration (SINR) criterion is used to optimize the spreading and despreading code. An iteration algorithm is given to create the optimal spreading and despreading code. Numerical results show that our scheme can greatly decrease the multiple access interference (MAI), hence greatly increase the SINR, compared with the conventional spreading code such as Gold code. Numerical results of the proposed scheme assuming different number of active users, Doppler frequency and coefficient estimation error are also given.
URL: https://global.ieice.org/en_transactions/communications/10.1587/e83-b_8_1649/_p
Salinan
@ARTICLE{e83-b_8_1649,
author={Ji-Bing WANG, Ming ZHAO, Shi-Dong ZHOU, Yan YAO, },
journal={IEICE TRANSACTIONS on Communications},
title={Optimal Sequences to Suppress the Multiuser Interference in the Downlink of the TDD-CDMA Systems},
year={2000},
volume={E83-B},
number={8},
pages={1649-1655},
abstract={Conventional multiuser interference canceling is always done in the uplink. In this paper, a novel multiuser interference canceling scheme is introduced. It can be used in the downlink of the TDD-CDMA systems. The multiuser interference canceling is done through the joint optimization of both the spreading and despreading waveform for different users, instead of the despreading code only. The idea is to take the advantages of exploitation, rather than mitigation, of the multipath propagation effects. In TDD-CDMA systems, the channel parameter of the downlink can be estimated from the uplink. We can calculate the spreading and despreading code by using the instantaneous channel parameters, so they can accommodate to the characteristic of the multipath channel. The maximum receive signal to interference plus noise ration (SINR) criterion is used to optimize the spreading and despreading code. An iteration algorithm is given to create the optimal spreading and despreading code. Numerical results show that our scheme can greatly decrease the multiple access interference (MAI), hence greatly increase the SINR, compared with the conventional spreading code such as Gold code. Numerical results of the proposed scheme assuming different number of active users, Doppler frequency and coefficient estimation error are also given.},
keywords={},
doi={},
ISSN={},
month={August},}
Salinan
TY - JOUR
TI - Optimal Sequences to Suppress the Multiuser Interference in the Downlink of the TDD-CDMA Systems
T2 - IEICE TRANSACTIONS on Communications
SP - 1649
EP - 1655
AU - Ji-Bing WANG
AU - Ming ZHAO
AU - Shi-Dong ZHOU
AU - Yan YAO
PY - 2000
DO -
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E83-B
IS - 8
JA - IEICE TRANSACTIONS on Communications
Y1 - August 2000
AB - Conventional multiuser interference canceling is always done in the uplink. In this paper, a novel multiuser interference canceling scheme is introduced. It can be used in the downlink of the TDD-CDMA systems. The multiuser interference canceling is done through the joint optimization of both the spreading and despreading waveform for different users, instead of the despreading code only. The idea is to take the advantages of exploitation, rather than mitigation, of the multipath propagation effects. In TDD-CDMA systems, the channel parameter of the downlink can be estimated from the uplink. We can calculate the spreading and despreading code by using the instantaneous channel parameters, so they can accommodate to the characteristic of the multipath channel. The maximum receive signal to interference plus noise ration (SINR) criterion is used to optimize the spreading and despreading code. An iteration algorithm is given to create the optimal spreading and despreading code. Numerical results show that our scheme can greatly decrease the multiple access interference (MAI), hence greatly increase the SINR, compared with the conventional spreading code such as Gold code. Numerical results of the proposed scheme assuming different number of active users, Doppler frequency and coefficient estimation error are also given.
ER -