一种Chirp信号的低复杂度频谱分割与聚合方法

A method of spectrum division and combination for Chirp signal

通过对扩频信号进行频谱分割、置乱、频谱插空和聚合恢复,不仅可以提高通信系统的频谱利用率,而且起到了物理层加密和提高抗截获能力的效果。但是,传统信号的频谱分割与聚合采用频域滤波器组技术,算法复杂度高,实用性差,且更容易受到干扰影响。针对线性调频(Chirp)扩频信号,利用其时频具有线性关系的特性,设计提出了一种基于时域成型窗算法,通过理论分析证明了与频域滤波等价的效果,较大程度降低了频谱分割聚合的复杂度,提高了聚合的鲁棒性。仿真结果表明,在Chirp-BOK通信系统中,该方法在误码率以及复杂度方面均优于传统频域滤波算法。

The spectrum division,scrambling,insertion and recombination recovery of the spread spectrum signal can not only improve the spectrum utilization rate of communication systems,but also improve the physical layer encryption and the anti⁃interception ability.However,the traditional signal spectrum division and recombination method adopts filter bank technology,which has high complexity and poor practicability,and is more susceptible to interference.In this paper,a time⁃domain shaping window algorithm is proposed to deal with the Chirp spread spectrum signal by utilizing the characteristic that its time⁃frequency has linear relationship.The theoretical analysis proves that its effect is equivalent to frequency domain filtering,which greatly re⁃duces the complexity of spectrum division and recombination and improves the robustness of recombination.The simulation re⁃sults show that,in Chirp⁃BOK communication system,this method is superior to traditional frequency domain filtering algorithm in terms of bit error rate and complexity.