摘要:
m序列相位編碼信號最小峰值旁瓣濾波器(LP濾波器)的沖激響應(yīng)序列可以通過解線性規(guī)劃問題求得。對于15位和31位全部m序列的計(jì)算結(jié)果表明,LP濾波器對峰值旁瓣有較大的抑制。對[4,3,0]反饋連接的起始狀態(tài)為1001的15位碼,它的長度為15的LP濾波器的峰值旁瓣電平降到21.47dB,比用匹配濾波器改善7.49dB;對[5,3,2,1,0]反饋連接的起始狀態(tài)為11101的31位碼,它的長度為31的LP濾波器的峰值旁瓣電平降到23.80dB,比用匹配濾波器改善6.01dB。當(dāng)濾波器的長度增加時(shí),LP濾波器可把峰值旁瓣抑制到更低電平。
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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