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...
| Main Authors: | , , , |
|---|---|
| Format: | Conference or Workshop Item |
| Language: | English |
| Published: |
IEEE
2008
|
| Online Access: | http://psasir.upm.edu.my/id/eprint/69110/ http://psasir.upm.edu.my/id/eprint/69110/1/Space-time%20and%20space-frequency%20OFDM%20with%20convolutional%20precoding%20over%20fading%20channels.pdf |
| _version_ | 1848856315368046592 |
|---|---|
| author | Noordin, Nor Kamariah Mohd Ali, Borhanuddin Jamuar, Sudhanshu Shekhar Ismail, Mahamod |
| author_facet | Noordin, Nor Kamariah Mohd Ali, Borhanuddin Jamuar, Sudhanshu Shekhar Ismail, Mahamod |
| author_sort | Noordin, Nor Kamariah |
| building | UPM Institutional Repository |
| collection | Online Access |
| 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. |
| first_indexed | 2025-11-15T11:39:42Z |
| format | Conference or Workshop Item |
| id | upm-69110 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T11:39:42Z |
| publishDate | 2008 |
| publisher | IEEE |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-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 |
| spellingShingle | Noordin, Nor Kamariah Mohd Ali, Borhanuddin Jamuar, Sudhanshu Shekhar Ismail, Mahamod Space-time and space-frequency OFDM with convolutional precoding over fading channels |
| title | 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_short | 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 |
| url | http://psasir.upm.edu.my/id/eprint/69110/ http://psasir.upm.edu.my/id/eprint/69110/ http://psasir.upm.edu.my/id/eprint/69110/1/Space-time%20and%20space-frequency%20OFDM%20with%20convolutional%20precoding%20over%20fading%20channels.pdf |