Reducing Peak-to-Average Power Ratio in OFDM Systems Using SLM Algorithm

OFDM (Orthogonal Frequency Division Multiplexing) is a digital communication system designed for transmitting digital information over wireless channels. To mitigate the Peak-to-Average Power Ratio (PAPR) in OFDM systems, the Selective Mapping (SLM) algorithm can be implemented. SLM is a time-domain precoding technique that reduces signal peak power through intelligent weighting of transmitted signals. The algorithm works by generating multiple candidate signals with different phase sequences and selecting the one with the lowest PAPR for transmission. In code implementation, this typically involves creating phase rotation vectors, applying IFFT (Inverse Fast Fourier Transform) operations, and comparing PAPR values using statistical calculations. By reducing peak power, SLM minimizes nonlinear distortion in power amplifiers, thereby enhancing system capacity and robustness. The algorithm's efficiency can be optimized through parallel processing of candidate signals and smart phase sequence generation. Therefore, SLM implementation significantly improves OFDM system performance, making it suitable for diverse application scenarios including 5G networks and broadband wireless communications.