Analysis of PAPR and BER in MIMO OFDM 5G Systems with different Modulation and Transform Techniques

Peak to average power ratio (PAPR) has been reduced using a number of different ways. For MIMO- OFDM system Selected Mapping (SLM) is one of the most impressive PAPR reducing techniques. This work looks into a useful peak to average power ratio reduction method for orthogonal frequency division multiplexing (OFDM) signals. The proposed scheme employs a combination of different modulation techniques and different transforms for the SLM technique with random phase sequences and centring matrix to reduce the PAPR and BER. Here 2X2 LTE-Multiple Input and Multiple Output (MIMO) technique is used for reducing PAPR and Bit Error Rate (BER). For the proposed method i.e. Differential Amplitude Phase Modulation (DAPM)-Discrete Wavelet Transform (DWT) combination PAPR and BER is less compared to all other combinations of modulation techniques such as Quadrature Amplitude Modulation (QAM), Pulse Amplitude Modulation (PAM) and transforms such as Discrete Fourier Transform (DFT), Discrete Cosine Transform (DCT). For MIMO OFDM technique, PAPR for the combination of DAPM-DWT is 3.433 at 1$0^{-1}$ CCDF and BER is 0.4006 at SNR of 20db and for LTE-MIMO, PAPR3.446 at 1$0^{-1}$CCDF and BER is 0.4285 at SNR of 20db.