Alvarion BreezeAccess II System Manual page 180

2-50
Max. Hopping Sequence (Shift) (channels) = Number of hopping
frequencies-1.
The actual hopping sequences depend on the method used for defining
the basic hopping sequence: Standard Scrambling, Enhanced
Scrambling or Manual Sequence Definition. In Enhanced Scrambling
mode it depends also on the number of frequencies.
Enhanced Scrambling mode, 7 or more frequencies:
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 Sequence
(Shift). The sequence is cyclic, so that adding 1 to the highest index in
the sequence (Index=N where N is the number of channels in the
sequence) results in the first channel (Index=1).
Example: Enhanced Scrambling, N=8, Spanning Factor=3:
Table 2-5: Hopping Sequence (Shift) Implementation, Enhanced Scrambling, N=8,
Hopping Sequence (Shift))
0 (basic sequence)
1
2
3
4
5
6
7
For example, if the defined hopping frequencies are 2411, 2412, 2413,
2414, 2415, 2416, 2417 and, 2418, then the frequencies of the actual
hopping sequences are as shown in the following table:
Table 2-6: Actual Hopping sequences, Enhanced Scrambling
Hopping
Sequence Hop #1 Hop #2
(Shift)
0 2411 2414
1 2412 2415
2 2413 2416
Manual Revision: 1.0
BreezeACCESS Version 4.5 Operations and Administration
Spanning Factor=3
Actual Sequence Indexes
1, 4, 7, 2, 5, 8, 3, 6
2, 5, 8, 3, 6, 1, 4, 7
3, 6, 1, 4, 7, 2, 5, 8
4, 7, 2, 5, 8, 3, 6, 1
5, 8, 3, 6, 1, 4, 7, 2
6, 1, 4, 7, 2, 5, 8, 3
7, 2, 5, 8, 3, 6, 1, 4
8, 3, 6, 1, 4, 7, 2, 5
(N=8, Spanning Factor=3)
Hop #3 Hop #4 Hop #5
2417 2412 2415
2418 2413 2416
2411 2414 2417
Hop #6 Hop #7 Hop #8
2418 2413 2416
2411 2414 2417
2412 2415 2418