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
A solicitação de repetição automática híbrida (HARQ) é empregada para o downlink Evolved Universal Terrestrial Radio Access (E-UTRA). Os sinais ACK/NACK de cada equipamento de usuário (UE) são multiplexados por acesso múltiplo por divisão de código (CDMA) e transmitidos através de um canal de controle de uplink físico (PUCCH). Os sinais ACK/NACK são códigos espalhados pelas sequências de deslocamento cíclico (CS) feitas a partir de sequências de autocorrelação zero (ZAC); entretanto, a ortogonalidade dessas sequências não é garantida dependendo dos canais de propagação; além disso, a quantidade de interferência entre códigos (ICI) depende da propagação de atraso do canal e do erro de controle de temporização de transmissão de cada UE. Na estrutura PUCCH convencional, o ICI entre dois sinais ACK não degrada o seu desempenho de detecção, enquanto o ICI entre um sinal ACK e um sinal NACK degrada o desempenho da detecção. Isto causa uma lacuna séria entre os desempenhos de detecção dos sinais ACK e NACK, porque geralmente em um PUCCH há mais sinais ACK do que sinais NACK. Neste artigo, propomos um novo esquema de rotação de fase nas constelações de sinais ACK/NACK que pode resolver este problema, e os resultados da avaliação da simulação confirmam os benefícios do esquema de rotação de fase proposto.
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Seigo NAKAO, Tomohumi TAKATA, Daichi IMAMURA, Katsuhiko HIRAMATSU, "A Novel Phase Rotation Scheme on the Constellations for the E-UTRA Uplink ACK/NACK Signals" in IEICE TRANSACTIONS on Communications,
vol. E92-B, no. 11, pp. 3459-3469, November 2009, doi: 10.1587/transcom.E92.B.3459.
Abstract: Hybrid automatic repeat request (HARQ) is employed for the Evolved Universal Terrestrial Radio Access (E-UTRA) downlink. The ACK/NACK signals from each user equipment (UE) are multiplexed by code division multiple access (CDMA) and transmitted via a physical uplink control channel (PUCCH). The ACK/NACK signals are code spread by the cyclic shift (CS) sequences made from zero auto-correlation (ZAC) sequences; however, the orthogonality of these sequences is not guaranteed depending on the propagation channels; moreover, the amount of inter-code interference (ICI) depends on the delay spread of the channel and the transmitting timing control error of each UE. In the conventional PUCCH structure, ICI between two ACK signals does not degrade their detection performance, whereas ICI between an ACK signal and a NACK signal degrades the detection performance. This causes a serious gap between the detection performances of ACK and NACK signals, because generally in a PUCCH, there are more ACK signals than NACK signals. In this paper, we propose a novel phase rotation scheme on the constellations of ACK/NACK signals that can resolve this issue, and the simulation evaluation results confirm the benefits of the proposed phase rotation scheme.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.E92.B.3459/_p
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@ARTICLE{e92-b_11_3459,
author={Seigo NAKAO, Tomohumi TAKATA, Daichi IMAMURA, Katsuhiko HIRAMATSU, },
journal={IEICE TRANSACTIONS on Communications},
title={A Novel Phase Rotation Scheme on the Constellations for the E-UTRA Uplink ACK/NACK Signals},
year={2009},
volume={E92-B},
number={11},
pages={3459-3469},
abstract={Hybrid automatic repeat request (HARQ) is employed for the Evolved Universal Terrestrial Radio Access (E-UTRA) downlink. The ACK/NACK signals from each user equipment (UE) are multiplexed by code division multiple access (CDMA) and transmitted via a physical uplink control channel (PUCCH). The ACK/NACK signals are code spread by the cyclic shift (CS) sequences made from zero auto-correlation (ZAC) sequences; however, the orthogonality of these sequences is not guaranteed depending on the propagation channels; moreover, the amount of inter-code interference (ICI) depends on the delay spread of the channel and the transmitting timing control error of each UE. In the conventional PUCCH structure, ICI between two ACK signals does not degrade their detection performance, whereas ICI between an ACK signal and a NACK signal degrades the detection performance. This causes a serious gap between the detection performances of ACK and NACK signals, because generally in a PUCCH, there are more ACK signals than NACK signals. In this paper, we propose a novel phase rotation scheme on the constellations of ACK/NACK signals that can resolve this issue, and the simulation evaluation results confirm the benefits of the proposed phase rotation scheme.},
keywords={},
doi={10.1587/transcom.E92.B.3459},
ISSN={1745-1345},
month={November},}
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TY - JOUR
TI - A Novel Phase Rotation Scheme on the Constellations for the E-UTRA Uplink ACK/NACK Signals
T2 - IEICE TRANSACTIONS on Communications
SP - 3459
EP - 3469
AU - Seigo NAKAO
AU - Tomohumi TAKATA
AU - Daichi IMAMURA
AU - Katsuhiko HIRAMATSU
PY - 2009
DO - 10.1587/transcom.E92.B.3459
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E92-B
IS - 11
JA - IEICE TRANSACTIONS on Communications
Y1 - November 2009
AB - Hybrid automatic repeat request (HARQ) is employed for the Evolved Universal Terrestrial Radio Access (E-UTRA) downlink. The ACK/NACK signals from each user equipment (UE) are multiplexed by code division multiple access (CDMA) and transmitted via a physical uplink control channel (PUCCH). The ACK/NACK signals are code spread by the cyclic shift (CS) sequences made from zero auto-correlation (ZAC) sequences; however, the orthogonality of these sequences is not guaranteed depending on the propagation channels; moreover, the amount of inter-code interference (ICI) depends on the delay spread of the channel and the transmitting timing control error of each UE. In the conventional PUCCH structure, ICI between two ACK signals does not degrade their detection performance, whereas ICI between an ACK signal and a NACK signal degrades the detection performance. This causes a serious gap between the detection performances of ACK and NACK signals, because generally in a PUCCH, there are more ACK signals than NACK signals. In this paper, we propose a novel phase rotation scheme on the constellations of ACK/NACK signals that can resolve this issue, and the simulation evaluation results confirm the benefits of the proposed phase rotation scheme.
ER -