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HD Radio标准中使用的“带内同频(IBOC)”技术在现有FM模拟广播的同频带内实现数字广播,无需打破现有的频率规划,是调频模拟广播数字化的最佳选择。然而模拟信号和数字信号同时通过混合天线发射时产生的耦合损耗非常大,降低数字信号的峰均比是减小损耗的有力措施。在降低峰均比的所有方案中,预留子载波法由于不引起信号的失真而受到广泛的关注,而预留子载波法的核心即是预留子载波位置的选取。基于HD Radio系统提出一种基于度量的预留子载波位置的选取方法,该方法通过一个度量值来衡量每个子载波对时域大幅度采样值的贡献,并选取具有最大的正度量值的子载波作为预留子载波。仿真结果表明,当使用30个预留子载波时,在概率为10-3时,提出的方案至少能带来0.79 dB的PAPR增益。
The “in-band co-frequency (IBOC)” technology used in the HD Radio standard enables digital broadcasting in the same frequency band of existing FM analog broadcasts without breaking existing frequency planning and is the best choice for digitizing analog FM broadcasting. However, the coupling loss generated when the analog signal and the digital signal are simultaneously transmitted through the hybrid antenna is very large. Reducing the peak-to-average ratio of the digital signal is a powerful measure to reduce the loss. In all the schemes to reduce the peak-to-average ratio, the reserved subcarrier method receives extensive attention because it does not cause distortion of the signal, and the core of the reserved subcarrier method is the selection of the reserved subcarrier position. Based on the HD Radio system, a metric-based method for selecting the location of the reserved subcarriers is proposed. This method measures the contribution of each subcarrier to the large-scale samples in the time domain by one metric and selects the one with the largest positive value Carrier as reserved subcarrier. The simulation results show that when using 30 reserved subcarriers, the proposed scheme can bring at least 0.79 dB PAPR gain when the probability is 10-3.