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
MMSE(최소 평균 제곱 오류) 기준을 기반으로 하는 FDE(주파수 영역 등화)는 주파수 선택 페이딩 채널에서 기존 레이크 결합을 통해 가능한 것 이상으로 DS-CDMA의 다운링크 BER(비트 오류율) 성능을 향상시킬 수 있습니다. FDE에는 정확한 채널 추정이 필요합니다. 최근 우리는 MMSE 기준을 기반으로 하는 파일럿 지원 채널 추정(CE)을 제안했습니다. MMSE-CE를 사용하면 채널 추정 정확도가 파일럿 칩 시퀀스에 거의 영향을 받지 않으며 우수한 BER 성능이 달성됩니다. 본 논문에서는 FDE를 사용하는 DS-CDMA에 대해 LMS(최소 평균 제곱) 알고리즘을 통해 채널 상태 변화에 따라 망각 요인을 적용하는 one-tap RLS(Recursive Least Square) 알고리즘을 사용한 채널 추정 기법을 제안합니다. 우리는 컴퓨터 시뮬레이션을 통해 주파수 선택형 고속 레일리 페이딩 채널에서 적응형 망각 인자를 갖춘 RLS-CE를 사용하여 BER 성능을 평가합니다.
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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},}
부
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 -