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
자동운전 장치 등 중요한 제어에 사용되는 사물인터넷(IoT) 통신에서도 높은 신뢰성이 요구된다. 따라서 물리계층에서는 상향링크(UL)와 하향링크(DL) 통신 품질이 모두 향상되어야 한다. 본 연구에서는 다중화 방식으로 OFDM(Orthogonal Frequency Division Multiplexing)을 사용하고 FEC(Forward Error Correction)로 터보 코드를 사용하여 구성된 방송 DL의 통신 품질에 중점을 둡니다. DL에서 프레임 오류율(FER)을 줄이기 위해 STBC(Space-Time Block Code) 또는 CDD(Cyclic-Delay Diversity)를 사용하는 두 가지 TD(전송 다이버시티) 기술을 고려합니다. 본 논문의 목적은 TD 성능을 평가하고 CDD의 FER 성능을 STBC까지 향상시키는 것이다. 이를 위해 CDD에 대한 FER을 향상시키는 채널 추정 방법을 제안한다. 이를 위해 먼저 컴퓨터 시뮬레이션을 수행하고 페이딩 에뮬레이터를 사용하여 하드웨어 테스트를 수행하여 STBC와 CDD의 FER 성능을 평가합니다. 그리고 2.5GHz 대역에서 현장 실험을 진행합니다. 이러한 평가 결과를 통해 STBC와 CDD가 단일 안테나 전송에 비해 FER을 향상시켰음을 확인합니다. 제안된 채널 추정 방법을 적용한 CDD는 채널 주파수 응답(CFR)을 정확하게 추정하고 순환 이동량(ACS)을 적절하게 조정하여 STBC와 거의 동일한 성능을 달성했습니다. 요코스카 연구단지 주변에서 수신된 장치를 이동할 때 STBC 및 CDD는 TD용 옴니 안테나를 사용한 공간 다이버시티를 사용하여 FER을 3.84×10에서 향상시켰습니다.-2 1.42×10까지-2 및 1.19 × 10-2각각.
Masafumi MORIYAMA
National Institute of Information and Communications Technology (NICT)
Kenichi TAKIZAWA
National Institute of Information and Communications Technology (NICT)
Hayato TEZUKA
National Institute of Information and Communications Technology (NICT)
Fumihide KOJIMA
National Institute of Information and Communications Technology (NICT)
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Masafumi MORIYAMA, Kenichi TAKIZAWA, Hayato TEZUKA, Fumihide KOJIMA, "Use of Cyclic-Delay Diversity (CDD) with Modified Channel Estimation for FER Improvement in OFDM Downlink" in IEICE TRANSACTIONS on Communications,
vol. E105-B, no. 3, pp. 326-337, March 2022, doi: 10.1587/transcom.2021EBP3060.
Abstract: High reliability is required, even in Internet of things (IoT) communications, which are sometimes used for crucial control such as automatic driving devices. Hence, both the uplink (UL) and downlink (DL) communication quality must be improved in the physical layer. In this study, we focus on the communication quality of broadcast DL, which is configured using orthogonal frequency-division multiplexing (OFDM) as a multiplexing scheme and turbo code as forward error correction (FEC). To reduce the frame-error rate (FER) in the DL, we consider two transmit-diversity (TD) techniques that use space-time block code (STBC) or cyclic-delay diversity (CDD). The purpose of this paper is to evaluate the TD performance and to enhance FER performance of CDD up to that of STBC. To achieve this goal, a channel estimation method is proposed to improve FER for CDD. For this purpose, we first evaluate the FER performance of STBC and CDD by performing computer simulations and conducting hardware tests using a fading emulator. Then, we conduct field experiments in the 2.5GHz band. From the results of these evaluations, we confirm that STBC and CDD improved FER compared with single antenna transmission. CDD with the proposed channel estimation method achieved almost the same performance as STBC by accurately estimating the channel frequency response (CFR) and appropriately adjusting the amount of cyclic shift (ACS). When moving a received device around Yokosuka Research Park, STBC and CDD, using spatial diversity with omni antennas for TD, improved the FER from 3.84×10-2 to 1.42×10-2 and 1.19×10-2, respectively.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.2021EBP3060/_p
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@ARTICLE{e105-b_3_326,
author={Masafumi MORIYAMA, Kenichi TAKIZAWA, Hayato TEZUKA, Fumihide KOJIMA, },
journal={IEICE TRANSACTIONS on Communications},
title={Use of Cyclic-Delay Diversity (CDD) with Modified Channel Estimation for FER Improvement in OFDM Downlink},
year={2022},
volume={E105-B},
number={3},
pages={326-337},
abstract={High reliability is required, even in Internet of things (IoT) communications, which are sometimes used for crucial control such as automatic driving devices. Hence, both the uplink (UL) and downlink (DL) communication quality must be improved in the physical layer. In this study, we focus on the communication quality of broadcast DL, which is configured using orthogonal frequency-division multiplexing (OFDM) as a multiplexing scheme and turbo code as forward error correction (FEC). To reduce the frame-error rate (FER) in the DL, we consider two transmit-diversity (TD) techniques that use space-time block code (STBC) or cyclic-delay diversity (CDD). The purpose of this paper is to evaluate the TD performance and to enhance FER performance of CDD up to that of STBC. To achieve this goal, a channel estimation method is proposed to improve FER for CDD. For this purpose, we first evaluate the FER performance of STBC and CDD by performing computer simulations and conducting hardware tests using a fading emulator. Then, we conduct field experiments in the 2.5GHz band. From the results of these evaluations, we confirm that STBC and CDD improved FER compared with single antenna transmission. CDD with the proposed channel estimation method achieved almost the same performance as STBC by accurately estimating the channel frequency response (CFR) and appropriately adjusting the amount of cyclic shift (ACS). When moving a received device around Yokosuka Research Park, STBC and CDD, using spatial diversity with omni antennas for TD, improved the FER from 3.84×10-2 to 1.42×10-2 and 1.19×10-2, respectively.},
keywords={},
doi={10.1587/transcom.2021EBP3060},
ISSN={1745-1345},
month={March},}
부
TY - JOUR
TI - Use of Cyclic-Delay Diversity (CDD) with Modified Channel Estimation for FER Improvement in OFDM Downlink
T2 - IEICE TRANSACTIONS on Communications
SP - 326
EP - 337
AU - Masafumi MORIYAMA
AU - Kenichi TAKIZAWA
AU - Hayato TEZUKA
AU - Fumihide KOJIMA
PY - 2022
DO - 10.1587/transcom.2021EBP3060
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E105-B
IS - 3
JA - IEICE TRANSACTIONS on Communications
Y1 - March 2022
AB - High reliability is required, even in Internet of things (IoT) communications, which are sometimes used for crucial control such as automatic driving devices. Hence, both the uplink (UL) and downlink (DL) communication quality must be improved in the physical layer. In this study, we focus on the communication quality of broadcast DL, which is configured using orthogonal frequency-division multiplexing (OFDM) as a multiplexing scheme and turbo code as forward error correction (FEC). To reduce the frame-error rate (FER) in the DL, we consider two transmit-diversity (TD) techniques that use space-time block code (STBC) or cyclic-delay diversity (CDD). The purpose of this paper is to evaluate the TD performance and to enhance FER performance of CDD up to that of STBC. To achieve this goal, a channel estimation method is proposed to improve FER for CDD. For this purpose, we first evaluate the FER performance of STBC and CDD by performing computer simulations and conducting hardware tests using a fading emulator. Then, we conduct field experiments in the 2.5GHz band. From the results of these evaluations, we confirm that STBC and CDD improved FER compared with single antenna transmission. CDD with the proposed channel estimation method achieved almost the same performance as STBC by accurately estimating the channel frequency response (CFR) and appropriately adjusting the amount of cyclic shift (ACS). When moving a received device around Yokosuka Research Park, STBC and CDD, using spatial diversity with omni antennas for TD, improved the FER from 3.84×10-2 to 1.42×10-2 and 1.19×10-2, respectively.
ER -