Abstract
Multi-antenna systems combined with the orthogonal frequency division multiplexing (OFDM) modulation technique can achieve reliable high data rate transmission over wireless channels. This paper proposes a self adaptive technique to eliminate severe fading effects in different multi antenna set-ups by adaptively updating the effective aperture of the transmitting antenna. The system changes the effective aperture of the transmitting antenna in time varying Rayleigh channels to adapt to a previously set system parameter. We consider here OFDM based single input-single output (SISO), single input-multi output (SIMO), multi input-single output (MISO), and multi input-multi output (MIMO) system with binary phase shift keying (BPSK). Finally, the system performance is analyzed for the different set-ups in terms of Bit error rate (BER). Here, two approaches are considered. Firstly BER vs. signal-to-noise ratio (SNR) result is analyzed and secondly the BER is improved by adaptively updating the effective aperture as per the requirement of the system. We will see that our results show significant performance improvement.
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