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

页码：1017 / +

页数：2

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