Computational Complexity Suppression of Precoding for OOBE Reduction of OFDM Signals

Spectrum sculpting pre-coding (SSP) with selected mapping (SLM) is a method for reducing the out-of-band emission (OOBE) of orthogonal frequency division multiplexing (OFDM) signals. Although the spectrum can be shaped into a steep rectangle by this method, computational complexity is substantial. This study proposes a method to suppress the computational complexity of this method. Numerical experiments show that the proposed method can maintain its performance, and suppress complexity to 50%.