PN Sequences By Dr. Ernest Simo 1.0 Definition and Generation Length of PN Sequences In general, it can be demonstrated that the Maximum Length of a PN Sequence generated by an N-stage Linear Shift Register is: L=2N-1 Where N is the number of stages of the Linear Shift Register. Note that only suitable Tap Combinations will yield a Maximum Length sequence. in other words, a given Tap Combination or arrangement does not necessarily produce a Maximum Length Sequence. Also note that the Linear Shift Register should not be seeded with an all zeros state: The Modulo-2 of two zeros yields another zero. This would result in a permanent state of zeros in the Linear Shift Register. PN Sequences By Dr. Ernest Simo © 1999 DR. ERNEST SIMO - SPACE2000

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