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ERROR FLOOR AND BER PERFORMANCE IN OFDM SYSTEMS USING STBC/SFBC SCHEMES BASED ON DETECTION TECHNIQUES

Er. Piyush Vyas, Er. Tejas Maniar

In this paper, we consider orthogonal space- frequency detection schemes for OFDM systems in broadband wireless channels. This paper proposes a compensation method to prevent error floor caused by unequal sub channels in the space-Time block coded OFDM systems for 1 and 2 transmit antennas in different parameters while providing diversity gain. This paper will show that for 1×1 & 2×2 antennas cases like JML, ZF, SML, DF etc, the proposed compensation method gives the zero forcing solution. Proposed paper and techniques compare the method with the space time block coded OFDM systems with respect to broadband wireless channel specifications in form of BER calcutions. It also shows the channel compensation method with sub division of wave forms that can be performed during the channel estimation using a Kalman filter.