SPACE-TIME AND SPACE-FREQUENCY OFDM WITH CONVOLUTIONAL PRECODING OVER FADING CHANNELS

被引:0
作者
Noordin, Nor K. [1 ]
Ali, Borhanuddin M. [1 ]
Jamuar, S. S. [1 ]
Ismail, Mahamod B. [2 ]
机构
[1] Univ Putra Malaysia, Fac Engn, Serdang 43400, Malaysia
[2] Univ Kebangsaan Malaysia, Fac Engn, Dept Elect Elect & Syst, Bangi 43600, Malaysia
来源
2008 IEEE REGION 10 CONFERENCE: TENCON 2008, VOLS 1-4 | 2008年
关键词
OFDM; transmit diversity; fading channels; space-time; space-frequency and convolutional coding;
D O I
暂无
中图分类号
TP3 [计算技术、计算机技术];
学科分类号
0812 ;
摘要
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 COMM systems as well as Alamouti's space time block code (STBC) system.
引用
收藏
页码:1017 / +
页数:2
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