Instruction manual

2-50
BreezeACCESS Version 4.3 Operations and Administration
Manual Revision: 4.0
 Enhanced Scrambling mode:
In this mode the shift operation is performed on the channel
indexes. The actual hopping channel is calculated by increasing
the indexes of the basic hopping sequence by the value of the
Hopping Shift. Note that the sequence is cyclic, meaning that
adding 1 to the highest index in the sequence (Index=N where N
is the number of channels in the sequence) will result in the first
channel (Index=1).
Example: Enhanced Scrambling, N=8, Spanning Factor=3:
Table 2-7: Hopping Shift Implementation, Enhanced Scrambling (N=8, Spanning
Factor=3)
If for example the defined hopping frequencies are 5730,
5740, 5750, 5760, 5770, 5780, 5790, 5800, then the
frequencies of the actual hopping sequences are:
Table 2-8: Actual Hopping sequences, Enhanced Scrambling (N=8, Spanning
Factor=3)
The following formula can be used for calculating the actual
hopping sequence:
Hopping Shift Actual Sequence Indexes
0 (basic sequence) 1, 4, 7, 2, 5, 8, 3, 6
1 2, 5, 8, 3, 6, 1, 4, 7
2 3, 6, 1, 4, 7, 2, 5, 8
3 4, 7, 2, 5, 8, 3, 6, 1
4 5, 8, 3, 6, 1, 4, 7, 2
5 6, 1, 4, 7, 2, 5, 8, 3
6 7, 2, 5, 8, 3, 6, 1, 4
7 8, 3, 6, 1, 4, 7, 2, 5
Hopping
Shift
Hop#1 Hop#2 Hop#3 Hop#4 Hop#5 Hop#6 Hop#7 Hop#8
0 5730 5760 5790 5740 5770 5800 5750 5780
1 5740 5770 5800 5750 5780 5730 5760 5790
2 5750 5780 5730 5760 5790 5740 5770 5800
3 5760 5790 5740 5770 5800 5750 5780 5730
4 5770 5800 5750 5780 5730 5760 5790 5740
5 5780 5730 5760 5790 5740 5770 5800 5750
6 5790 5740 5770 5800 5750 5780 5730 5760
7 5800 5750 5780 5730 5760 5790 5740 5770