A New SLM Scheme Based on Constellation Rotation for PAPR Reduction

A new selected mapping (SLM) scheme based on constellation rotation is proposed to reduce the peak-to-average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) signals. Its core idea is to generate abundant candidate signals by rotating different sub-signals of the original frequency signal with different angles. This new signal generation method can simplify the calculation process of candidate time signals into the linear addition of some intermediate signals, which are generated by the inverse fast Fourier transform (IFFT) operation of the original frequency signal. This feature can effectively reduce the computational complexity of candidate signal generation process. And compared to the traditional SLM scheme, the number of complex multiplication and complex addition of new scheme can separately be decreased by about 99.99 % and 91.7 % with some specific parameters. Moreover, with the help of the constellation detection mechanism at the receiver, there is no need to carry any side information at the transmitter. The simulation results show that, with the same channel transmission performance, the PAPR reduction performance of new scheme can approach or even exceed the upper bound of the traditional SLM scheme, which uses all the vectors in Hadamard matrix as the phase sequences.