Background and Introduction to PN Codes
By Dr. Ernest Simo

9.0 What are the characteristics of 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 = 2exp(N) - 1 = 2exp(15) - 1 = 32, 768 – 1


    By implementation, an extra chip is inserted at the end of the sequence, yielding an extended sequence of length L = 32,768 chips
The Short PN Code runs at a speed of 1 228 800 chips per second. This results in a repetition cycle of 32 768/1 228 800 = 26.67 ms


Click here to view Figure 4




© 2001 DR. ERNEST SIMO - SPACE2000
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