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

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

doi:10.1109/MWCN.2002.1045838

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

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

Department of Information and Computer Science

Research output: Chapter in Book/Report/Conference proceeding › Conference 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 language	English
Title of host publication	2002 4th International Workshop on Mobile and Wireless Communications Network, MWCN 2002
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	611-615
Number of pages	5
ISBN (Print)	0780376056, 9780780376052
DOIs	https://doi.org/10.1109/MWCN.2002.1045838
Publication status	Published - 2002
Event	4th International Workshop on Mobile and Wireless Communications Network, MWCN 2002 - Stockholm, Sweden Duration: 2002 Sept 9 → 2002 Sept 11

Other

Other	4th International Workshop on Mobile and Wireless Communications Network, MWCN 2002
Country/Territory	Sweden
City	Stockholm
Period	02/9/9 → 02/9/11

Keywords

Adaptive Array Antenna
Antenna Separation
CCI
MMSE
OFDM
SINR

ASJC Scopus subject areas

Computer Networks and Communications

Access to Document

10.1109/MWCN.2002.1045838

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). Article 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. et al.
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 proceeding › Conference 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

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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",

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booktitle = "2002 4th International Workshop on Mobile and Wireless Communications Network, MWCN 2002",

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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

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

PB - Institute of Electrical and Electronics Engineers Inc.

T2 - 4th International Workshop on Mobile and Wireless Communications Network, MWCN 2002

Y2 - 9 September 2002 through 11 September 2002

ER -

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

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Keywords

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