Patent ID: 7944991

Claim:
Signal transmission apparatus, comprising: a clipping module for clipping a multicarrier time-domain signal at a predetermined clipping level to produce a clipped multicarrier signal; a transforming module for Fourier transforming the clipped multicarrier signal into a frequency domain to produce a frequency domain clipped multicarrier signal; an in-band processing module for processing the frequency domain clipped multicarrier signal to produce a signal whose error vector magnitude is below a predetermined threshold and whose peak-to-average power ratio (PAR) is at a level lower than the PAR level of the multicarrier time-domain signal; an out-of-band processing module for processing the frequency domain clipped multicarrier signal to satisfy an out-of-band spectral power mask; an inverse transforming module for inverse Fourier transforming a combined in-band and out-of-band processed signal to produce a low-PAR time-domain signal; wherein the in-band module adds an adjustment vector to the frequency domain clipped multicarrier signal so that the error vector magnitude is reduced; and wherein a sorting algorithm is applied to determine a set of in-band error vectors that are to be modified.