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
Sur la liaison inverse (mobile vers base) de la radio mobile à accès multiple par répartition en code de séquence directe (DS-CDMA), le contrôle de puissance de transmission rapide (TPC) en boucle fermée doit être suffisamment rapide pour suivre l'évanouissement rapide par trajets multiples. Cependant, dans les zones urbaines, le trajet en visibilité directe (LOS) peut apparaître brusquement lorsqu'une station mobile apparaît derrière un bâtiment et plus tard, soudainement, le LOS peut disparaître, entraînant un changement brusque de perte de trajet de l'ordre de 30 à 40 %. 0.8 dB. Ce changement d'affaiblissement de trajet "on-off" peut être considéré comme un cas particulier d'occultation. Cette ombre "on-off" provoque deux problèmes au niveau de la station de base : génération d'interférences d'accès multiple (MAI) sévères pour d'autres utilisateurs lorsque le chemin LOS apparaît et dégradation de la qualité de son propre signal lorsque le chemin LOS disparaît. Cet article propose un nouveau TPC rapide en boucle fermée basé sur des transitions d'état de Markov (appelé Markov fast TPC). La transition d'état est déterminée par l'historique des commandes TPC binaires reçues et envoyées depuis la station de base. La taille du pas TPC est associée à chaque état. En modifiant la taille du pas entre 4 dB et XNUMX dB, le TPC rapide de Markov peut mieux suivre les ombres « on-off » ainsi que l'évanouissement par trajets multiples par rapport au TPC rapide en boucle fermée à un état classique. Une nouvelle méthode d'estimation SIR utilisée dans la génération de commandes TPC est également proposée. L'erreur TPC est évaluée par simulation informatique pour démontrer l'adaptabilité du TPC rapide de Markov proposé dans un canal à évanouissement de Rayleigh superposé par une ombre "on-off".
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Hirohito SUDA, Hiroyuki KAWAI, Fumiyuki ADACHI, "A Fast Transmit Power Control Based on Markov Transition for DS-CDMA Mobile Radio" in IEICE TRANSACTIONS on Communications,
vol. E82-B, no. 8, pp. 1353-1362, August 1999, doi: .
Abstract: On the reverse (mobile-to-base) link of direct sequence code division multiple access (DS-CDMA) mobile radio, closed-loop fast transmit power control (TPC) must be sufficiently fast to track fast multipath fading. However, in urban areas, the line-of-sight (LOS) path may appear abruptly when a mobile station appears from behind a building and later suddenly the LOS may disappear, resulting in an abrupt path-loss change in the order of 30 to 40 dB. This "on-off" path loss change can be considered as a special case of shadowing. This "on-off" shadowing causes two problems at the base station: generation of severe multiple access interference (MAI) to other users when the LOS path appears and degradation of the quality of its own signal when the LOS path disappears. This paper proposes a new closed-loop fast TPC based on Markov-state transitions (called Markov fast TPC). State transition is determined by the past history of the received binary TPC commands sent from the base station. The TPC step size is associated with each state. By changing the step size between as small as 0.8 dB and as large as 4 dB, the Markov fast TPC can better track "on-off" shadowing as well as multipath fading compared to conventional one-state closed-loop fast TPC. A new SIR estimation method used in TPC command generation is also proposed. The TPC error is evaluated by computer simulation to demonstrate the adaptability of the proposed Markov fast TPC in a Rayleigh fading channel superimposed by "on-off" shadowing.
URL: https://global.ieice.org/en_transactions/communications/10.1587/e82-b_8_1353/_p
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@ARTICLE{e82-b_8_1353,
author={Hirohito SUDA, Hiroyuki KAWAI, Fumiyuki ADACHI, },
journal={IEICE TRANSACTIONS on Communications},
title={A Fast Transmit Power Control Based on Markov Transition for DS-CDMA Mobile Radio},
year={1999},
volume={E82-B},
number={8},
pages={1353-1362},
abstract={On the reverse (mobile-to-base) link of direct sequence code division multiple access (DS-CDMA) mobile radio, closed-loop fast transmit power control (TPC) must be sufficiently fast to track fast multipath fading. However, in urban areas, the line-of-sight (LOS) path may appear abruptly when a mobile station appears from behind a building and later suddenly the LOS may disappear, resulting in an abrupt path-loss change in the order of 30 to 40 dB. This "on-off" path loss change can be considered as a special case of shadowing. This "on-off" shadowing causes two problems at the base station: generation of severe multiple access interference (MAI) to other users when the LOS path appears and degradation of the quality of its own signal when the LOS path disappears. This paper proposes a new closed-loop fast TPC based on Markov-state transitions (called Markov fast TPC). State transition is determined by the past history of the received binary TPC commands sent from the base station. The TPC step size is associated with each state. By changing the step size between as small as 0.8 dB and as large as 4 dB, the Markov fast TPC can better track "on-off" shadowing as well as multipath fading compared to conventional one-state closed-loop fast TPC. A new SIR estimation method used in TPC command generation is also proposed. The TPC error is evaluated by computer simulation to demonstrate the adaptability of the proposed Markov fast TPC in a Rayleigh fading channel superimposed by "on-off" shadowing.},
keywords={},
doi={},
ISSN={},
month={August},}
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TY - JOUR
TI - A Fast Transmit Power Control Based on Markov Transition for DS-CDMA Mobile Radio
T2 - IEICE TRANSACTIONS on Communications
SP - 1353
EP - 1362
AU - Hirohito SUDA
AU - Hiroyuki KAWAI
AU - Fumiyuki ADACHI
PY - 1999
DO -
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E82-B
IS - 8
JA - IEICE TRANSACTIONS on Communications
Y1 - August 1999
AB - On the reverse (mobile-to-base) link of direct sequence code division multiple access (DS-CDMA) mobile radio, closed-loop fast transmit power control (TPC) must be sufficiently fast to track fast multipath fading. However, in urban areas, the line-of-sight (LOS) path may appear abruptly when a mobile station appears from behind a building and later suddenly the LOS may disappear, resulting in an abrupt path-loss change in the order of 30 to 40 dB. This "on-off" path loss change can be considered as a special case of shadowing. This "on-off" shadowing causes two problems at the base station: generation of severe multiple access interference (MAI) to other users when the LOS path appears and degradation of the quality of its own signal when the LOS path disappears. This paper proposes a new closed-loop fast TPC based on Markov-state transitions (called Markov fast TPC). State transition is determined by the past history of the received binary TPC commands sent from the base station. The TPC step size is associated with each state. By changing the step size between as small as 0.8 dB and as large as 4 dB, the Markov fast TPC can better track "on-off" shadowing as well as multipath fading compared to conventional one-state closed-loop fast TPC. A new SIR estimation method used in TPC command generation is also proposed. The TPC error is evaluated by computer simulation to demonstrate the adaptability of the proposed Markov fast TPC in a Rayleigh fading channel superimposed by "on-off" shadowing.
ER -