User's Manual

Flexible Hopping Definition Mode
The scrambled basic sequence can also be calculated using the formula:
P
x
(j)= {[(j-1)*X]mod(N)}+1
Where:
X is the Spanning Factor
N is the number of channels in the sequence (modulus)
J is the sequence index
Example: N=8, X=3
P
1
(5)={[(1-1)*3}mod8}+1=1
P
2
(5)={[(2-1)*3}mod8}+1=6
od8}+1=5
od8}+1=2
P
7
(5)={[(7-1)*3}mod8}+1=7
P
8
(5)={[(8-1)*3}mod8}+1=4
And the basic scrambled sequence is: 1, 4, 7, 2, 5, 8, 3, 6.
Manual Sequence Definition
Manually defines the hopping sequence, using numbered channel
indexes (from 1 to “Number of Hopping Frequencies”). The sequence
length must be equal to “Number of Hopping Frequencies” (all the
defined frequencies must be used).
Erase Manual Sequence
Erases the manually defined hopping sequence.
Spanning Factor (AU only)
Defines the Spanning Factor to be used by the Enhanced Scrambling
mechanism. The Spanning Factor should be chosen so that the GCD
(Greater Common Divisor) of the Spanning Factor and the Number of
Hopping Frequencies would be 1 (e.g. for 8 frequencies possible values
for the Spanning Factor are 1, 3, 5 and 7). The SU learns the value of
the Spanning Factor from the AU during the association process.
Use of different spanning factors by non-synchronized neighboring base
stations reduces the probability of interference between adjacent
sectors.
P
3
(5)={[(3-1)*3}mod8}+1=3
P
4
(5)={[(4-1)*3}mod8}+1=8
P
5
(5)={[(5-1)*3}m
P
6
(5)={[(6-1)*3}m
Manual Revision
D-5