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
É necessária alta confiabilidade, mesmo nas comunicações da Internet das coisas (IoT), que às vezes são usadas para controle crucial, como dispositivos de direção automática. Conseqüentemente, a qualidade da comunicação tanto no uplink (UL) quanto no downlink (DL) deve ser melhorada na camada física. Neste estudo, nos concentramos na qualidade de comunicação de transmissão DL, que é configurada usando multiplexação por divisão de frequência ortogonal (OFDM) como esquema de multiplexação e código turbo como correção direta de erros (FEC). Para reduzir a taxa de erro de quadro (FER) no DL, consideramos duas técnicas de diversidade de transmissão (TD) que usam código de bloco espaço-tempo (STBC) ou diversidade de atraso cíclico (CDD). O objetivo deste artigo é avaliar o desempenho do TD e melhorar o desempenho do FER do CDD até o do STBC. Para atingir este objetivo, é proposto um método de estimativa de canal para melhorar o FER para CDD. Para tanto, primeiro avaliamos o desempenho do FER de STBC e CDD realizando simulações computacionais e realizando testes de hardware utilizando um emulador de desvanecimento. Em seguida, realizamos experimentos de campo na banda de 2.5 GHz. A partir dos resultados destas avaliações, confirmamos que o STBC e o CDD melhoraram o FER em comparação com a transmissão por antena única. O CDD com o método de estimativa de canal proposto alcançou quase o mesmo desempenho que o STBC, estimando com precisão a resposta de frequência do canal (CFR) e ajustando adequadamente a quantidade de mudança cíclica (ACS). Ao mover um dispositivo recebido pelo Yokosuka Research Park, STBC e CDD, usando diversidade espacial com antenas omni para TD, melhoraram o FER de 3.84×10-2 para 1.42 × 10-2 e 1.19 × 10-2, Respectivamente.
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)
The copyright of the original papers published on this site belongs to IEICE. Unauthorized use of the original or translated papers is prohibited. See IEICE Provisions on Copyright for details.
Copiar
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
Copiar
@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},}
Copiar
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 -