Multicarrier Modulation has attracted a lot of attention in the modern communication world to satisfy the need for higher bit rate. The most popular MCM technique, OFDM has low efficiency due to the insertion of cyclic prefix and the use of IFFT in OFDM leads to poor stopband behaviour for OFDM prototype filter which leads to spectral leakage among the subchannels. Due to the disadvantages of OFDM, Filter Bank based MultiCarrier system with Offset Quadrature Amplitude Modulation has been proposed. The prototype filter for FBMC-OQAM system is designed using frequency sampling method of filter design from which the whole filterbank is formed by exponential modulation. For every multicarrier system, high PAPR is the main issue. Simple PAPR reduction methods like clipping, A-law comapnding, μ-law companding etc are carried out in the FBMC-OQAM system and the system performance is evaluated using CCDF plot and BER plot. Simulation results show that the proposed scheme has better PAPR reduction performance than the existing methods along with a good BER performance.

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Multi-carrier modulation techniques have now become a standard in many communication protocols. Filter bank based multi-carrier (FBMC) generation techniques have been discussed in the literature as a means for overcoming the shortcomings of IFFT/FFT based OFDM system. The Peak to Average Power Ratio (PAPR) is a problem faced by all multi-carrier techniques. This paper discusses the methods for reducing PAPR in a FBMC system while maintaining acceptable Bit Error Rate (BER). A new PAPR minimizing scheme called Constrained Reed Solomon (CRS) coding is proposed. The hybrid techniques using coding and companding are tested for different channel models and is found to yield promising results.