PAPR Reduction in SFBC OFDM System-MCMA Approach

In high speed data transmission, Orthogonal Frequency Division Multiplexing (OFDM) is a spectrally proficient method over multipath fading channel. This OFDM signal suffers from high Peak-to-average power ratio (PAPR) and Bit Error Rate (BER) (Van Nee and de Wild, Vehic. Technol. Conf. 3:2072–2076, 1998) [1]. MIMO OFDM configuration step-up the capacity of the system and diversity gain on frequency selective and time variant channels. Preference is on SFBC-MIMO-OFDM to operate fading channel much more effectively. Constant Modulus Algorithm (CMA) is highly proficient technique for alleviating high PAPR. But the main demerit associated with CMA is slow convergence rate, extensive steady state mean square error (SSMSE), and phase blind nature. We propose an enhanced modified constant modulus algorithm (MCMA) where the step size is carefully assessed to maintain a balancing between convergence rate and final accuracy. Simulations demonstrates the efficiency of proposed MCMA.