PN Sequences By Dr. Ernest Simo 1.0 Definition and Generation The Short PN Code In IS-95, two types of Maximum-Length PN Sequences or PN Codes are used: The Short PN Code and the Long PN Code. The Short PN Code is generated by a 15-stage Linear Shift Register. Therefore, the maximum length of the Short PN Code is: L=2N-1 = 215-1=32,768-1 By implementation, an extra chip is inserted at the end of the sequence, yielding a sequence of length L=32,768 chips. The Short PN Code runs at a speed of 1,228,800 chips per second. This yields a repetition cycle of 32,768/1,228,800=26.67ms CODE: AN INTRODUCTION By Dr. Ernest Simo © 1999 DR. ERNEST SIMO - SPACE2000