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

Nor K. Noordin, Borhanuddin M. Ali, S. S. Jamuar, Mahamod Ismail

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

1 Citation (Scopus)

Abstract

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 Alamouti's space time block code (STBC) system.

Original languageEnglish
Title of host publicationIEEE Region 10 Annual International Conference, Proceedings/TENCON
DOIs
Publication statusPublished - 2008
Event2008 IEEE Region 10 Conference, TENCON 2008 - Hyderabad
Duration: 19 Nov 200821 Nov 2008

Other

Other2008 IEEE Region 10 Conference, TENCON 2008
CityHyderabad
Period19/11/0821/11/08

Fingerprint

Fading channels
Orthogonal frequency division multiplexing
Fading (radio)
Frequency selective fading
Multipath fading
Block codes
Redundancy
Signal to noise ratio

Keywords

  • Fading channels
  • OFDM
  • Space-frequency and convolutional coding
  • Space-time
  • Transmit diversity

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Science Applications

Cite this

Noordin, N. K., Ali, B. M., Jamuar, S. S., & Ismail, M. (2008). Space-time and space-frequency OFDM with convolutional precoding over fading channels. In IEEE Region 10 Annual International Conference, Proceedings/TENCON [4766476] https://doi.org/10.1109/TENCON.2008.4766476

Space-time and space-frequency OFDM with convolutional precoding over fading channels. / Noordin, Nor K.; Ali, Borhanuddin M.; Jamuar, S. S.; Ismail, Mahamod.

IEEE Region 10 Annual International Conference, Proceedings/TENCON. 2008. 4766476.

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

Noordin, NK, Ali, BM, Jamuar, SS & Ismail, M 2008, Space-time and space-frequency OFDM with convolutional precoding over fading channels. in IEEE Region 10 Annual International Conference, Proceedings/TENCON., 4766476, 2008 IEEE Region 10 Conference, TENCON 2008, Hyderabad, 19/11/08. https://doi.org/10.1109/TENCON.2008.4766476
Noordin NK, Ali BM, Jamuar SS, Ismail M. Space-time and space-frequency OFDM with convolutional precoding over fading channels. In IEEE Region 10 Annual International Conference, Proceedings/TENCON. 2008. 4766476 https://doi.org/10.1109/TENCON.2008.4766476
Noordin, Nor K. ; Ali, Borhanuddin M. ; Jamuar, S. S. ; Ismail, Mahamod. / Space-time and space-frequency OFDM with convolutional precoding over fading channels. IEEE Region 10 Annual International Conference, Proceedings/TENCON. 2008.
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