Adaptive spatial mode of space-time and spacefrequency OFDM system over fading channels
In this paper we present a 2 transmit 1 receive (1 Tx : 1 Rx) adaptive spatial mode (ASM) of space-time (ST) and space-frequency (SF) orthogonal frequency division multiplexing (OFDM). At low signal to noise ratio (SNR) we employ ST-OFDM and switch to SF-OFDM at a certain SNR threshold. We determ...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Penerbit UTM Press
2006
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| Subjects: | |
| Online Access: | http://eprints.utm.my/id/eprint/4109/1/JTD_2005_09.pdf http://eprints.utm.my/id/eprint/4109/ http://www.penerbit.utm.my/onlinejournal/45/D/JTDis45D04.pdf |
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| Summary: | In this paper we present a 2 transmit 1 receive (1 Tx : 1 Rx) adaptive spatial
mode (ASM) of space-time (ST) and space-frequency (SF) orthogonal frequency division
multiplexing (OFDM). At low signal to noise ratio (SNR) we employ ST-OFDM and switch
to SF-OFDM at a certain SNR threshold. We determine this threshold from the intersection
of individual performance curves. Results show a gain of 9 dB (at a bit error rate of 10-3) is
achieved by employing adaptive spatial mode compared to a fixed ST-OFDM, almost 6 dB
to fixed SF-OFDM, 4 dB to Coded ST-OFDM and 2 dB to a fixed coded SF-OFDM, at a
delay spread of 700 ns.
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