| 摘要 |
In known OFDM (orthogonal frequency division multiplex) systems, such as DVB-T2, it is known to reduce PAPR (peak to average power ratio) using a tone reservation scheme. In this scheme some tones/sub-carriers are reserved for carrying peak cancellation signals or kernels. These kernels ideally produce a time domain spike which is subtracted from a signal peak (see Figs. 3 and 4). The invention determines the optimal placement of the reserved tones in the IFFT (inverse fast Fourier transform) frequency domain empirically from simulation models. Better results were obtained using sampling rates higher than the real system would use in practice, preferably four times higher. The optimal results were selected from the simulations based on the ratio between amplitude of the largest and second largest peaks produced by the kernels. |
