Reduction in PAPR-BER of MIMO System using Hybrid Companding and DCT Technique
Keywords:
PTS, DCT, COMPANDING, MIMO-OFDM, PAPR, BERAbstract
One of the major drawback of OFDM system is relatively high Peak-to-Average Power Ratio (PAPR), which tends to reduce the power efficiency of the Radio Frequency Amplifier. In order to minimize the PAPR ratio this thesis focuses on PAPR reduction techniques. Extensive investigation of different PAPR reduction techniques has been made. Based on the survey it is found Selective Mapping (SLM) is the most widely used PAPR reduction technique. It is distortion less, efficient, offers better BER performance and can be implemented for any number of sub-carriers. One of the disadvantage is high computational complexity. In this paper hybrid discrete cosine transform (DCT) and companding, for two antennas MIMO-OFDM system, is proposed which can achieve better PAPR performance at much less bit error rate (BER). Simulation results show that the proposed approach can reduce BER and achieve a better PAPR reduction compared to previous technique.
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