| High PAPR is a critical issue in any multicarrier systems using OFDM, as terrestrial DVB. It can result in low power efficiency and large performance degradation of systems, due to the nonlinearity of HPA. In this paper we propose a PAPR reduction method based on tone reservation technique with SOCP approach in terrestrial DVB systems. We first demonstrate the superiority of the SOCP optimization algorithm compared with an iterative gradient-based algorithm, using the current DVB-T parameters: significant PAPR reduction gains can be achieved with only a very small set of subcarriers in the useful bandwidth, making the proposed method more promising in terms of spectral efficiency. Moreover, the proposed solution presents a very good trade-off between PAPR reduction gain and mean transmitted power increase. An overall study, taking into account the limitation of the power level of the dedicated subcarriers and the evaluation of the performances in presence of a nonlinear HPA, is presented. These performances are given in terms of ACPR and BER. The resulting PAPR reduction gain demonstrates that the relevance of the proposed method for the future DVB-T standard is straightforward. |
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