Simulating PAPR Reduction Using SLM Method in STBC MIMO OFDM Systems

This study demonstrates PAPR reduction using Selective Mapping (SLM) method in STBC MIMO OFDM systems. The SLM technique effectively reduces Peak-to-Average Power Ratio by introducing phase rotations to transmitted signals. In the implementation, multiple candidate signals are generated through different phase sequences, and the signal with minimum PAPR is selected for transmission. Key algorithmic steps include: 1) Generating U different phase rotation vectors 2) Applying these vectors to original OFDM symbols 3) Calculating PAPR for each candidate signal 4) Selecting optimal signal using min(PAPR) criterion 5) Transmitting side information for phase recovery. The MATLAB implementation typically involves: creating phase sets using 'randi' or predefined sequences, applying element-wise multiplication with '.*' operator, PAPR calculation using 'max(abs(x).^2)/mean(abs(x).^2)', and incorporating STBC encoding through Kronecker product operations. The system performance improvement can be evaluated through CCDF (Complementary Cumulative Distribution Function) plots comparing original and SLM-modified signals.