PAPR Reduction In DVB Based MIMO OFDM System Using Various Coding Techniques

The capability of handling very strong echoes, robustness to channel fading, immunity to impulse interference, and lesser nonlinear distortion makes MIMO– OFDM one of the promising technique for the fourthgeneration mobile communications. However, one of the main disadvantage associated with MIMO-OFDM is the high peakto-average power ratio (PAPR) of the transmitter's output signal on different antennas. High Peak to Average Power Ratio (PAPR) for MIMO-OFDM system is still a demanding area and difficult issue. The occurrences of high peaks in the transmitted OFDM signal cases the degradation of the system performance due to various non-linear effects like spectral spreading, intermodulation, and signal constellation that exist inherently in power amplifiers. In this paper, various coding techniques like SQRT, DCT are used to obtain a significant reduction in PAPR. The results obtained are plotted in forms of graphs and are compared with earlier results of transform techniques. Simulations show that better results are obtained in the proposed technique.