Proposed Algorithm for MIMO OFDM Systems on Fast Time Varying Multipath Fading Channel

Abstract

quotWe have discussed the issue of PAPR in OFDM system based on low complexity scrambling newlineapproach and raised cosine filter with interleaver method. We have minimized the value of newlinePAPR in OFDM system. In low complexity technique, we have present the novel PAPR minimization technique which is based on the combination of probabilistic approach and coded approach. In the proposed algorithm the out-of-band radiation is reduced as well as complexity of physical system is low. In the extended work, we have solve the problem in 3-GPP LTE physical layer system in which to achieve the lowest PAPR value with respect newlineto OFDM system with multiple interleaver. We have targeted uplink of the LTE system in which we have used the OFDM system with multiple interleaver to minimize the probability of error as well as to reduce the PAPR based on various shaping filter coefficient. newlineAs further extension of the work, the proposed estimation technique of MIMO-OFDM system newlinewith respect to time varying mobile velocity. We have evaluated the channel with respect to the SKF and DKF method for linear channel estimation. For known mobile velocity, proposed algorithm outperforms compared to conventional algorithm. We have further extended the work with respect to the nonlinear channel estimation. When mobile velocity is rapidly change or unknown then nonlinear Kalman filter performs better compared to SKF and DKF method. newlineIn the same line of research, we have proposed adaptive fuzzy cubature Kalman filter equalization newlinetechnique on MIMO-OFDM system with velocity of the mobile is time varying. This method is based on various membership function. In this case we have considered the different mobile velocity. This approach is more adaptive compared to other technique. As per the requirement, we have select the membership function and track the channel which minimize the BER. The proposed method is suitable for non linear channel estimation in which newlineamplitude of the channel and Doppler shift parameters are simultaneously estimated. The newlineproposed method d