The period of a PN sequence produced by a linear m stage shift register cannot exceed _____ symbols.(a) 2m(b) m(c) 2^m(d) 2^m-1I have been asked this question in an interview for internship.This intriguing question originated from Spread Spectrum Modulation Techniques topic in section Modulation Techniques for Mobile Radio of Wireless/Mobile

The period of a PN sequence produced by a linear m stage shift registe

1.	The period of a PN sequence produced by a linear m stage shift register cannot exceed _____ symbols.(a) 2m(b) m(c) 2^m(d) 2^m-1I have been asked this question in an interview for internship.This intriguing question originated from Spread Spectrum Modulation Techniques topic in section Modulation Techniques for Mobile Radio of Wireless/Mobile
Answer» The correct CHOICE is (d) 2^m-1 Easy explanation: There are EXACTLY 2^m-1 non-zero states for an m STAGE feedback shift register. Thus, the period of a PN sequence produced by a LINEAR m stage shift register cannot exceed 2^m-1.

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