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DESIGN AND IMPLEMENTATION OF MIMO-OFDM FOR 4G MOBILE COMMUNICATIONS

V.R.Balaji, D.P.BalaSubramanian,K.Kalaikaviya,N.R.G.Sreevani

In mobile communication environment, the wireless channel is time varying due to the mobility of the wireless terminals and multipath propagation. Basically in all space time block coded orthogonal frequency domain multiplexing scheme the channel remain static with in the whole codeword length .STBC scheme is one of the most effective approach that uses transmit diversity to avoid the undesired effect arises in the wireless fading channel .Orthogonal designed STBC can achieve full transmit diversity .the transmitted symbols can be decoded separately instead jointly, which greatly facilitate the receiver design .As the system uses orthogonal code for transmission cant achieve full transmission rate with more then two transmit antenna, hence the alternative method is proposed .in order to improve the performance of OFDM system with multiple transmit antenna in the double selective fading channel ,the design of four transmit antenna based space-time-frequency coded OFDM scheme is introduced in this work for enhancing the performance. The STFC-OFDM system can be designed using verilog HDL and simulated using modelsim software.