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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2008
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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 |
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| language |
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| 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 |
13.250246 |