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Space-time and space-frequency OFDM with convolutional precoding over fading channels

Transmit diversity in orthogonal frequency division multiplexing (OFDM) has gained a lot of interest recently due to its ability to transform frequency selective fading into multiple flat fadings. In this paper we investigate 2 transmit and 1 receive (2Tx:1Rx) space-time OFDM (ST-OFDM) and space-fre...

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Main Authors: Noordin, Nor Kamariah, Mohd Ali, Borhanuddin, Jamuar, Sudhanshu Shekhar, Ismail, Mahamod
Format: Conference or Workshop Item
Language:English
Published: IEEE 2008
Online Access:http://psasir.upm.edu.my/id/eprint/69110/1/Space-time%20and%20space-frequency%20OFDM%20with%20convolutional%20precoding%20over%20fading%20channels.pdf
http://psasir.upm.edu.my/id/eprint/69110/
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spelling my.upm.eprints.691102019-06-12T07:34:52Z http://psasir.upm.edu.my/id/eprint/69110/ Space-time and space-frequency OFDM with convolutional precoding over fading channels Noordin, Nor Kamariah Mohd Ali, Borhanuddin Jamuar, Sudhanshu Shekhar Ismail, Mahamod Transmit diversity in orthogonal frequency division multiplexing (OFDM) has gained a lot of interest recently due to its ability to transform frequency selective fading into multiple flat fadings. In this paper we investigate 2 transmit and 1 receive (2Tx:1Rx) space-time OFDM (ST-OFDM) and space-frequency OFDM (SF-OFDM) systems in conjunction with convolutional precoding as a redundancy method to combat channel impairments. We built our ST and SF-OFDM on top of our coded OFDM (COFDM) with convolutional coding of rate 1/4 and constraint length of 10. We simulated our ST-OFDM and SF-OFDM over a multipath fading channel using Naftali 802.11 channel model under various delay spreads in relation to outdoor environment. SF-OFDM show a slight performance improvement under these conditions as compared to ST-OFDM by as much as 3 dB signal to noise ratio (SNR) requirement for the same BER of 10-4 for a delay spread of 1.5 microseconds. We also compare our precoded ST-OFDM and SF-OFDM against conventional single carrier OFDM and COFDM systems as well as Alamoutipsilas space time block code (STBC) system. IEEE 2008 Conference or Workshop Item PeerReviewed text en http://psasir.upm.edu.my/id/eprint/69110/1/Space-time%20and%20space-frequency%20OFDM%20with%20convolutional%20precoding%20over%20fading%20channels.pdf Noordin, Nor Kamariah and Mohd Ali, Borhanuddin and Jamuar, Sudhanshu Shekhar and Ismail, Mahamod (2008) Space-time and space-frequency OFDM with convolutional precoding over fading channels. In: 2008 IEEE Region 10 Conference (TENCON 2008), 19-21 Nov. 2008, Hyderabad, India. (pp. 1-6). 10.1109/TENCON.2008.4766476
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
description Transmit diversity in orthogonal frequency division multiplexing (OFDM) has gained a lot of interest recently due to its ability to transform frequency selective fading into multiple flat fadings. In this paper we investigate 2 transmit and 1 receive (2Tx:1Rx) space-time OFDM (ST-OFDM) and space-frequency OFDM (SF-OFDM) systems in conjunction with convolutional precoding as a redundancy method to combat channel impairments. We built our ST and SF-OFDM on top of our coded OFDM (COFDM) with convolutional coding of rate 1/4 and constraint length of 10. We simulated our ST-OFDM and SF-OFDM over a multipath fading channel using Naftali 802.11 channel model under various delay spreads in relation to outdoor environment. SF-OFDM show a slight performance improvement under these conditions as compared to ST-OFDM by as much as 3 dB signal to noise ratio (SNR) requirement for the same BER of 10-4 for a delay spread of 1.5 microseconds. We also compare our precoded ST-OFDM and SF-OFDM against conventional single carrier OFDM and COFDM systems as well as Alamoutipsilas space time block code (STBC) system.
format Conference or Workshop Item
author Noordin, Nor Kamariah
Mohd Ali, Borhanuddin
Jamuar, Sudhanshu Shekhar
Ismail, Mahamod
spellingShingle Noordin, Nor Kamariah
Mohd Ali, Borhanuddin
Jamuar, Sudhanshu Shekhar
Ismail, Mahamod
Space-time and space-frequency OFDM with convolutional precoding over fading channels
author_facet Noordin, Nor Kamariah
Mohd Ali, Borhanuddin
Jamuar, Sudhanshu Shekhar
Ismail, Mahamod
author_sort Noordin, Nor Kamariah
title Space-time and space-frequency OFDM with convolutional precoding over fading channels
title_short Space-time and space-frequency OFDM with convolutional precoding over fading channels
title_full Space-time and space-frequency OFDM with convolutional precoding over fading channels
title_fullStr Space-time and space-frequency OFDM with convolutional precoding over fading channels
title_full_unstemmed Space-time and space-frequency OFDM with convolutional precoding over fading channels
title_sort space-time and space-frequency ofdm with convolutional precoding over fading channels
publisher IEEE
publishDate 2008
url http://psasir.upm.edu.my/id/eprint/69110/1/Space-time%20and%20space-frequency%20OFDM%20with%20convolutional%20precoding%20over%20fading%20channels.pdf
http://psasir.upm.edu.my/id/eprint/69110/
_version_ 1643839401549103104
score 13.211869

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