Zadoff-Chu序列的内插算法

脉冲压缩体制斜向短波信道探测主要利用Zadoff-Chu序列良好的周期自相关特性进行相关检测。为使Zadoff-Chu序列的频谱特性与信道探测收发信机的要求相匹配,提出一种适合Zadoff-Chu序列的FDI内插算法,以改善其频谱特性,并与一般内插算法内插后的序列频谱进行比较。仿真结果表明:采用FDI内插算法插值后序列的频谱滚降更快,且几乎没有旁瓣,能量十分集中,确认了FDI内插算法的优越性;在接收端,通过理论推导给出了一种实现采用FDI算法内插后的序列最佳抽取的方法。计算和仿真结果验证了该方法的有效性。

Interpolation algorithm of Zadoff-Chu sequence

The oblique HF channel sounding is carried out by using pulse compression technique for correlation detection according to the favorable periodic autocorrelation property of Zadoff-Chu sequence.In order to adapt the spectrum property of Zadoff-Chu sequence to the requirement of HF channel sounding transceiver,the FDI interpolation algorithm was put forward,by which the spectrum property of Zadoff-Chu sequence could be improved.Then the spectra of the sequences respectively inserted by FDI were compared with those obtained by the commonly used interpolation algorithm.The simulation result shows that the spectrum of the sequence interpolated by FDI has a faster roll-off,almost without big side-lobes and that the superiority of FDI is confirmed.Finally,a method was proposed for the optimal extraction of the sequence inserted by FDI and was proved to be effective by calculations and simulations.All these lay a primary theoretical foundation for the application of Zadoff-Chu sequence to HF channel sounding.