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".
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The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Neste artigo, propomos um algoritmo AGC (Automatic Gain Control) para busca inicial de células no sistema 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) TDD (Time Division Duplex). Como o sinal recebido tem uma grande diferença de potência de sinal entre o subquadro de uplink e downlink em sistemas de comunicação sem fio usando um esquema TDD, o esquema AGC convencional não pode ajustar suficientemente o ganho do AGC porque o ganho do AGC não pode convergir rápido o suficiente para responder adequadamente. Portanto, o esquema AGC convencional leva ao aumento da variação do ganho do AGC, e o sinal recebido será atenuado pela grande variação do ganho do AGC. Para superar esta limitação, propomos um esquema AGC baseado no cálculo da razão de amplitude média que pode não apenas aumentar efetivamente a velocidade de convergência do ganho do AGC, mas também manter a estabilidade da operação do AGC no sistema LTE TDD. Além disso, é importante que o AGC convirja eficientemente para a detecção precisa do tempo do quadro de rádio durante o procedimento inicial subsequente de busca de células. Portanto, também consideramos o esquema AGC proposto em combinação com a interface de detecção PSS (Primary Synchronization Signal) para a primeira etapa do processo inicial de busca de células no sistema LTE TDD para obter uma operação AGC estável e um desempenho preciso de detecção de PSS. Por extensa simulação computacional na presença de deslocamento de frequência e vários ambientes de canal, verificamos que o método proposto pode obter um bom comportamento em termos de demodulação e desempenho de detecção de PSS no sistema LTE TDD.
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Jun-Hee JANG, Keun-Dea KIM, Hyung-Jin CHOI, "An Enhanced Automatic Gain Control Algorithm for Initial Cell Search in 3GPP LTE TDD System" in IEICE TRANSACTIONS on Communications,
vol. E93-B, no. 12, pp. 3606-3615, December 2010, doi: 10.1587/transcom.E93.B.3606.
Abstract: In this paper, we propose an AGC (Automatic Gain Control) algorithm for initial cell search in 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) TDD (Time Division Duplex) system. Since the received signal has a large signal power difference between uplink and downlink subframe in wireless communication systems using a TDD scheme, conventional AGC scheme cannot sufficiently adjust the AGC gain because the AGC gain cannot converge fast enough to properly respond. Therefore, conventional AGC scheme leads to increased AGC gain variation, and the received signal will be attenuated by large AGC gain variation. To overcome this limitation, we propose an AGC scheme based on the average amplitude ratio calculation which can not only effectively increase convergence speed of the AGC gain but also maintain the stability of AGC operation in LTE TDD system. Also, it is important for AGC to converge efficiently for the accurate radio frame timing detection during the subsequent initial cell search procedure. Therefore, we also consider the proposed AGC scheme in combination with PSS (Primary Synchronization Signal) detection interface for the first step of initial cell search process in LTE TDD system to obtain both a stable AGC operation and accurate PSS detection performance. By extensive computer simulation in the presence of frequency offset and various channel environments, we verified that the proposed method can obtain a good behavior in terms of demodulation and PSS detection performance in LTE TDD system.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.E93.B.3606/_p
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@ARTICLE{e93-b_12_3606,
author={Jun-Hee JANG, Keun-Dea KIM, Hyung-Jin CHOI, },
journal={IEICE TRANSACTIONS on Communications},
title={An Enhanced Automatic Gain Control Algorithm for Initial Cell Search in 3GPP LTE TDD System},
year={2010},
volume={E93-B},
number={12},
pages={3606-3615},
abstract={In this paper, we propose an AGC (Automatic Gain Control) algorithm for initial cell search in 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) TDD (Time Division Duplex) system. Since the received signal has a large signal power difference between uplink and downlink subframe in wireless communication systems using a TDD scheme, conventional AGC scheme cannot sufficiently adjust the AGC gain because the AGC gain cannot converge fast enough to properly respond. Therefore, conventional AGC scheme leads to increased AGC gain variation, and the received signal will be attenuated by large AGC gain variation. To overcome this limitation, we propose an AGC scheme based on the average amplitude ratio calculation which can not only effectively increase convergence speed of the AGC gain but also maintain the stability of AGC operation in LTE TDD system. Also, it is important for AGC to converge efficiently for the accurate radio frame timing detection during the subsequent initial cell search procedure. Therefore, we also consider the proposed AGC scheme in combination with PSS (Primary Synchronization Signal) detection interface for the first step of initial cell search process in LTE TDD system to obtain both a stable AGC operation and accurate PSS detection performance. By extensive computer simulation in the presence of frequency offset and various channel environments, we verified that the proposed method can obtain a good behavior in terms of demodulation and PSS detection performance in LTE TDD system.},
keywords={},
doi={10.1587/transcom.E93.B.3606},
ISSN={1745-1345},
month={December},}
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TY - JOUR
TI - An Enhanced Automatic Gain Control Algorithm for Initial Cell Search in 3GPP LTE TDD System
T2 - IEICE TRANSACTIONS on Communications
SP - 3606
EP - 3615
AU - Jun-Hee JANG
AU - Keun-Dea KIM
AU - Hyung-Jin CHOI
PY - 2010
DO - 10.1587/transcom.E93.B.3606
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E93-B
IS - 12
JA - IEICE TRANSACTIONS on Communications
Y1 - December 2010
AB - In this paper, we propose an AGC (Automatic Gain Control) algorithm for initial cell search in 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) TDD (Time Division Duplex) system. Since the received signal has a large signal power difference between uplink and downlink subframe in wireless communication systems using a TDD scheme, conventional AGC scheme cannot sufficiently adjust the AGC gain because the AGC gain cannot converge fast enough to properly respond. Therefore, conventional AGC scheme leads to increased AGC gain variation, and the received signal will be attenuated by large AGC gain variation. To overcome this limitation, we propose an AGC scheme based on the average amplitude ratio calculation which can not only effectively increase convergence speed of the AGC gain but also maintain the stability of AGC operation in LTE TDD system. Also, it is important for AGC to converge efficiently for the accurate radio frame timing detection during the subsequent initial cell search procedure. Therefore, we also consider the proposed AGC scheme in combination with PSS (Primary Synchronization Signal) detection interface for the first step of initial cell search process in LTE TDD system to obtain both a stable AGC operation and accurate PSS detection performance. By extensive computer simulation in the presence of frequency offset and various channel environments, we verified that the proposed method can obtain a good behavior in terms of demodulation and PSS detection performance in LTE TDD system.
ER -