Weight tracking method for OFDM adaptive array in time variant fading channel

T. Hiramoto, A. Mizuki, M. Shibahara, T. Fujii, Iwao Sasase

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In an orthogonal frequency division multiplexing (OFDM) system, in order to remove the influence of co-channel interference (CCI), the minimum mean square error-adaptive array antenna (MMSE-AAA) is attractive. To get the space diversity gain, the distance between adjacent elements should be set to be more than several wavelengths. However, it is difficult to derive the optimal weights with a few training symbols because the fading status is independent in each element. As a result, the bit error rate (BER) performance is deteriorated. We propose a novel weight tracking method to achieve space diversity gain and fast convergence with a few pilot symbols. In the proposed method, before updating the weight, channel estimation is applied to track the multipath fading of the desired signals. By computer simulation, we show that the proposed system improves the BER performance compared to the conventional system without channel estimation, even if the Doppler frequency is high.

Original languageEnglish
Title of host publication2002 4th International Workshop on Mobile and Wireless Communications Network, MWCN 2002
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages611-615
Number of pages5
ISBN (Print)0780376056, 9780780376052
DOIs
Publication statusPublished - 2002
Event4th International Workshop on Mobile and Wireless Communications Network, MWCN 2002 - Stockholm, Sweden
Duration: 2002 Sep 92002 Sep 11

Other

Other4th International Workshop on Mobile and Wireless Communications Network, MWCN 2002
CountrySweden
CityStockholm
Period02/9/902/9/11

Fingerprint

Channel estimation
Fading channels
Bit error rate
Orthogonal frequency division multiplexing
Smart antennas
Multipath fading
Mean square error
Wavelength
Computer simulation

Keywords

  • Adaptive Array Antenna
  • Antenna Separation
  • CCI
  • MMSE
  • OFDM
  • SINR

ASJC Scopus subject areas

  • Computer Networks and Communications

Cite this

Hiramoto, T., Mizuki, A., Shibahara, M., Fujii, T., & Sasase, I. (2002). Weight tracking method for OFDM adaptive array in time variant fading channel. In 2002 4th International Workshop on Mobile and Wireless Communications Network, MWCN 2002 (pp. 611-615). [1045838] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/MWCN.2002.1045838

Weight tracking method for OFDM adaptive array in time variant fading channel. / Hiramoto, T.; Mizuki, A.; Shibahara, M.; Fujii, T.; Sasase, Iwao.

2002 4th International Workshop on Mobile and Wireless Communications Network, MWCN 2002. Institute of Electrical and Electronics Engineers Inc., 2002. p. 611-615 1045838.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Hiramoto, T, Mizuki, A, Shibahara, M, Fujii, T & Sasase, I 2002, Weight tracking method for OFDM adaptive array in time variant fading channel. in 2002 4th International Workshop on Mobile and Wireless Communications Network, MWCN 2002., 1045838, Institute of Electrical and Electronics Engineers Inc., pp. 611-615, 4th International Workshop on Mobile and Wireless Communications Network, MWCN 2002, Stockholm, Sweden, 02/9/9. https://doi.org/10.1109/MWCN.2002.1045838
Hiramoto T, Mizuki A, Shibahara M, Fujii T, Sasase I. Weight tracking method for OFDM adaptive array in time variant fading channel. In 2002 4th International Workshop on Mobile and Wireless Communications Network, MWCN 2002. Institute of Electrical and Electronics Engineers Inc. 2002. p. 611-615. 1045838 https://doi.org/10.1109/MWCN.2002.1045838
Hiramoto, T. ; Mizuki, A. ; Shibahara, M. ; Fujii, T. ; Sasase, Iwao. / Weight tracking method for OFDM adaptive array in time variant fading channel. 2002 4th International Workshop on Mobile and Wireless Communications Network, MWCN 2002. Institute of Electrical and Electronics Engineers Inc., 2002. pp. 611-615
@inproceedings{9966dcd1cca1457c9d1f13f035eac5f5,
title = "Weight tracking method for OFDM adaptive array in time variant fading channel",
abstract = "In an orthogonal frequency division multiplexing (OFDM) system, in order to remove the influence of co-channel interference (CCI), the minimum mean square error-adaptive array antenna (MMSE-AAA) is attractive. To get the space diversity gain, the distance between adjacent elements should be set to be more than several wavelengths. However, it is difficult to derive the optimal weights with a few training symbols because the fading status is independent in each element. As a result, the bit error rate (BER) performance is deteriorated. We propose a novel weight tracking method to achieve space diversity gain and fast convergence with a few pilot symbols. In the proposed method, before updating the weight, channel estimation is applied to track the multipath fading of the desired signals. By computer simulation, we show that the proposed system improves the BER performance compared to the conventional system without channel estimation, even if the Doppler frequency is high.",
keywords = "Adaptive Array Antenna, Antenna Separation, CCI, MMSE, OFDM, SINR",
author = "T. Hiramoto and A. Mizuki and M. Shibahara and T. Fujii and Iwao Sasase",
year = "2002",
doi = "10.1109/MWCN.2002.1045838",
language = "English",
isbn = "0780376056",
pages = "611--615",
booktitle = "2002 4th International Workshop on Mobile and Wireless Communications Network, MWCN 2002",
publisher = "Institute of Electrical and Electronics Engineers Inc.",

}

TY - GEN

T1 - Weight tracking method for OFDM adaptive array in time variant fading channel

AU - Hiramoto, T.

AU - Mizuki, A.

AU - Shibahara, M.

AU - Fujii, T.

AU - Sasase, Iwao

PY - 2002

Y1 - 2002

N2 - In an orthogonal frequency division multiplexing (OFDM) system, in order to remove the influence of co-channel interference (CCI), the minimum mean square error-adaptive array antenna (MMSE-AAA) is attractive. To get the space diversity gain, the distance between adjacent elements should be set to be more than several wavelengths. However, it is difficult to derive the optimal weights with a few training symbols because the fading status is independent in each element. As a result, the bit error rate (BER) performance is deteriorated. We propose a novel weight tracking method to achieve space diversity gain and fast convergence with a few pilot symbols. In the proposed method, before updating the weight, channel estimation is applied to track the multipath fading of the desired signals. By computer simulation, we show that the proposed system improves the BER performance compared to the conventional system without channel estimation, even if the Doppler frequency is high.

AB - In an orthogonal frequency division multiplexing (OFDM) system, in order to remove the influence of co-channel interference (CCI), the minimum mean square error-adaptive array antenna (MMSE-AAA) is attractive. To get the space diversity gain, the distance between adjacent elements should be set to be more than several wavelengths. However, it is difficult to derive the optimal weights with a few training symbols because the fading status is independent in each element. As a result, the bit error rate (BER) performance is deteriorated. We propose a novel weight tracking method to achieve space diversity gain and fast convergence with a few pilot symbols. In the proposed method, before updating the weight, channel estimation is applied to track the multipath fading of the desired signals. By computer simulation, we show that the proposed system improves the BER performance compared to the conventional system without channel estimation, even if the Doppler frequency is high.

KW - Adaptive Array Antenna

KW - Antenna Separation

KW - CCI

KW - MMSE

KW - OFDM

KW - SINR

UR - http://www.scopus.com/inward/record.url?scp=84962829113&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84962829113&partnerID=8YFLogxK

U2 - 10.1109/MWCN.2002.1045838

DO - 10.1109/MWCN.2002.1045838

M3 - Conference contribution

AN - SCOPUS:84962829113

SN - 0780376056

SN - 9780780376052

SP - 611

EP - 615

BT - 2002 4th International Workshop on Mobile and Wireless Communications Network, MWCN 2002

PB - Institute of Electrical and Electronics Engineers Inc.

ER -