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Coded Space-Time-Frequency OFDM over IEEE 802.11 Fading Channels

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4 Author(s)
Noordin, N.K. ; Fac. of Eng., Universiti Putra Malaysia ; Ali, B.M. ; Jamuar, S.S. ; Ismail, M.B.

In this paper we present 4 transmit and 1 receive (4Tx:1Rx) antenna system of coded space-time-frequency in conjunction with orthogonal frequency division multiplexing (coded STF-OFDM). We concatenate STF block code with channel coding namely convolutional code of rate 1/2 with length 5 to combat channel impairment. We compare our coded STF scheme with ST-OFDM and SF-OFDM over IEEE 802.11 multipath channel under delay spread of 700 ns and 1 us in outdoor environments. Results show that coded STF-OFDM scheme outperforms other schemes by as much as 8 dB (against ST-OFDM) in spread of 700 ns. The scheme also outperforms others over a severe channel with delay spread of 1 us but is almost comparable to coded SF-OFDM

Published in:

Communications, 2005 Asia-Pacific Conference on

Date of Conference:

5-5 Oct. 2005