摘要:
m序列相位编码信号最小峰值旁瓣滤波器(LP滤波器)的冲激响应序列可以通过解线性规划问题求得。对于15位和31位全部m序列的计算结果表明,LP滤波器对峰值旁瓣有较大的抑制。对[4,3,0]反馈连接的起始状态为1001的15位码,它的长度为15的LP滤波器的峰值旁瓣电平降到21.47dB,比用匹配滤波器改善7.49dB;对[5,3,2,1,0]反馈连接的起始状态为11101的31位码,它的长度为31的LP滤波器的峰值旁瓣电平降到23.80dB,比用匹配滤波器改善6.01dB。当滤波器的长度增加时,LP滤波器可把峰值旁瓣抑制到更低电平。
Abstract:
The impulse response sequence of min imum peak sidelobe filter (LP filter) for m-sequence phase-coded waveform can be f ound by using linear programming method. The results of computation for all the 15-element and 31-element m-sequences show that the LP filters can significantly suppress the peak sidelobes. Por the 15-element code with feedback connection [4, 3, 0] and initial condition 1001, the peak sidelobe Ievel is reduced to - 21.47 dB by using LP filter of length 15, and it is 7.49 dB better than that by using matched filter. For the 31-element code with feedback connection [5,3,2,1] and initial condition 11101, the peak sidelobe level is reduced to -23.80 dB by suing LP filter of length 31, and it is 6.01 dB better than that by using matched filter. The LP filter can suppress the peak sidelobe even more when its length is increased.
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