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
A equalização no domínio da frequência (FDE) baseada no critério do erro quadrático médio mínimo (MMSE) pode aumentar o desempenho da taxa de erro de bit (BER) do downlink do DS-CDMA além do possível com a combinação de rake convencional em um canal de desvanecimento seletivo de frequência. FDE requer estimativa precisa do canal. Recentemente, propusemos uma estimativa de canal assistida por piloto (CE) baseada no critério MMSE. Usando MMSE-CE, a precisão da estimativa do canal é quase insensível à sequência do chip piloto e um bom desempenho de BER é alcançado. Neste artigo, propomos um esquema de estimativa de canal usando o algoritmo de mínimos quadrados recursivos (RLS) de um toque, onde o fator de esquecimento é adaptado à mudança da condição do canal pelo algoritmo de mínimos quadrados médios (LMS), para DS-CDMA com FDE. Avaliamos o desempenho do BER usando RLS-CE com fator de esquecimento adaptativo em um canal de desvanecimento rápido de Rayleigh seletivo em frequência por simulação computacional.
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Yohei KOJIMA, Hiromichi TOMEBA, Kazuaki TAKEDA, Fumiyuki ADACHI, "RLS Channel Estimation with Adaptive Forgetting Factor for DS-CDMA Frequency-Domain Equalization" in IEICE TRANSACTIONS on Communications,
vol. E92-B, no. 5, pp. 1457-1465, May 2009, doi: 10.1587/transcom.E92.B.1457.
Abstract: Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can increase the downlink bit error rate (BER) performance of DS-CDMA beyond that possible with conventional rake combining in a frequency-selective fading channel. FDE requires accurate channel estimation. Recently, we proposed a pilot-assisted channel estimation (CE) based on the MMSE criterion. Using MMSE-CE, the channel estimation accuracy is almost insensitive to the pilot chip sequence, and a good BER performance is achieved. In this paper, we propose a channel estimation scheme using one-tap recursive least square (RLS) algorithm, where the forgetting factor is adapted to the changing channel condition by the least mean square (LMS) algorithm, for DS-CDMA with FDE. We evaluate the BER performance using RLS-CE with adaptive forgetting factor in a frequency-selective fast Rayleigh fading channel by computer simulation.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.E92.B.1457/_p
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@ARTICLE{e92-b_5_1457,
author={Yohei KOJIMA, Hiromichi TOMEBA, Kazuaki TAKEDA, Fumiyuki ADACHI, },
journal={IEICE TRANSACTIONS on Communications},
title={RLS Channel Estimation with Adaptive Forgetting Factor for DS-CDMA Frequency-Domain Equalization},
year={2009},
volume={E92-B},
number={5},
pages={1457-1465},
abstract={Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can increase the downlink bit error rate (BER) performance of DS-CDMA beyond that possible with conventional rake combining in a frequency-selective fading channel. FDE requires accurate channel estimation. Recently, we proposed a pilot-assisted channel estimation (CE) based on the MMSE criterion. Using MMSE-CE, the channel estimation accuracy is almost insensitive to the pilot chip sequence, and a good BER performance is achieved. In this paper, we propose a channel estimation scheme using one-tap recursive least square (RLS) algorithm, where the forgetting factor is adapted to the changing channel condition by the least mean square (LMS) algorithm, for DS-CDMA with FDE. We evaluate the BER performance using RLS-CE with adaptive forgetting factor in a frequency-selective fast Rayleigh fading channel by computer simulation.},
keywords={},
doi={10.1587/transcom.E92.B.1457},
ISSN={1745-1345},
month={May},}
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TY - JOUR
TI - RLS Channel Estimation with Adaptive Forgetting Factor for DS-CDMA Frequency-Domain Equalization
T2 - IEICE TRANSACTIONS on Communications
SP - 1457
EP - 1465
AU - Yohei KOJIMA
AU - Hiromichi TOMEBA
AU - Kazuaki TAKEDA
AU - Fumiyuki ADACHI
PY - 2009
DO - 10.1587/transcom.E92.B.1457
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E92-B
IS - 5
JA - IEICE TRANSACTIONS on Communications
Y1 - May 2009
AB - Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can increase the downlink bit error rate (BER) performance of DS-CDMA beyond that possible with conventional rake combining in a frequency-selective fading channel. FDE requires accurate channel estimation. Recently, we proposed a pilot-assisted channel estimation (CE) based on the MMSE criterion. Using MMSE-CE, the channel estimation accuracy is almost insensitive to the pilot chip sequence, and a good BER performance is achieved. In this paper, we propose a channel estimation scheme using one-tap recursive least square (RLS) algorithm, where the forgetting factor is adapted to the changing channel condition by the least mean square (LMS) algorithm, for DS-CDMA with FDE. We evaluate the BER performance using RLS-CE with adaptive forgetting factor in a frequency-selective fast Rayleigh fading channel by computer simulation.
ER -