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then the object outputs M samples of a PN sequence that has a period of N 2 n 1, where n.
This object implements LFSR using a simple shift register generator (SSRG, or Fibonacci) configuration. Get Computer Security and Cryptography now with the O’Reilly learning platform. The comm.PNSequence System object generates a sequence of pseudorandom binary numbers using a linear-feedback shift register (LFSR). The XOR of periodic sequence with periods, the integers are relatively prime.) Just as Vernam additively combined tapes of relatively prime lengths to produce a tape with a much longer period, the same result is achieved by additively combining LFSRs of suitable total lengths to produce a LFSR with a much larger period.įigure 8.7 The XOR of k linear feedback shift registers. 8.7 COMBINING MULTIPLE LINEAR FEEDBACK SHIFT REGISTERSįigure 8.7 shows how linear feedback shift registers can be combined by XORing their outputs.
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