多带OFDM-UWB系统峰均功率比降低方法研究

PAPR reduction in multi-band OFDM-UWB system

针对多带OFDM-UWB信号存在高峰均功率比的问题,提出了利用扩展与交织降低系统信号峰均功率比的方法。该方法通过对传输数据进行正交扩展与交织,使得进入多载波调制的数据趋于高斯分布,减小了传输数据自相关函数的旁瓣峰值,降低了OFDM-UWB信号的峰均功率比。由于采用正交矩阵进行扩展,扩展前后的数据传输速率保持不变。仿真结果表明,扩展与交织可以有效地降低信号峰均功率比2～5dB左右。同时该方法还具有抗窄带干扰的鲁棒性。

Against the high peak-to-average power ratio （PAPR） of the multi-band OFDM-UWB signal, a novel method is proposed to reduce the PAPR, which is based on spreading and interleaving. This would make the spread and interleaved data tend toward Gaussian distributions, reduce the peak in the sidelobe of the autocorrelation function and decrease the probability of the high PAPR. Due to orthogonal matrix transform, the rate of the spread signal is the same as that of before spreading. Simulation results show that spreading and interleaving could reduce the PAPR 2-5dB. Meanwhile, it could provide the robustness to narrow-band interference.