Assignment 4

DATA SCRAMBLERS

1. What is a maximal length sequence?

2. Modulo 2 addition corresponds to the XOR operation. (T/F)

3. Define: Irreducible polynomial and
   primitive polynomial   Are they the same?

4. Why are scramblers used in the front ends of digital transmitters?

5. h(D)= 1 + D +D^2 + D^3 + D^4
   What is the period of the sequence generator?

6. Verify 
   h(D)=(1 + D + D^2)(1 + D + D^3)
       = 1 + D^4 + D^5
 
7. Find the initial states that result in sequences with periods 3,7 using Q 6. above .
   Record the states and corresponding sequences.