Author/Authors :
NOORDIN, NOR K. Universiti Putra Malaysia - Faculty of Engineering, MALAYSIA , ALI, BORHANUDDIN M. Universiti Putra Malaysia - Faculty of Engineering, MALAYSIA , JAMUAR, S. S. Universiti Putra Malaysia - Faculty of Engineering, MALAYSIA , RAHMAN, THAREK A. Universiti Teknologi Malaysia - Faculty of Electrical Engineering, MALAYSIA , ISMAIL, MAHAMOD Universiti Kebangsaan Malaysia - Faculty of Engineering, MALAYSIA
Abstract :
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.
Keywords :
OFDM , space , time , space , frequency , channel coding and multipath fading channels.
