CDMA2000 Signaling
R&S
®
CMW-KG8xx/-KM8xx/-KS8xx
481
User Manual 1173.9511.02 ─ 11
Table 4-4: Example for SF=4 and N=4
Hadamard (Walsh codes)
after mapping to +1/-1
Code number
Bit reverse (OVSF codes)
decimal
binary
1 1 1 1
0
00
1 1 1 1
1 -1 1 -1
1
01
1 1 -1 -1
1 1 -1 -1
2
10
1 -1 1 -1
1 -1 -1 1
3
11
1 -1 -1 1
Quasi-Orthogonal Functions
To increase the number of possible channels the IS-2000 standard defines alternative
sets of orthogonal functions. These functions are called Quasi-Orthogonal Functions
(QOF) and can be used in parallel to the Walsh functions. QOF are defined for radio
configurations 3 to 9. For the purpose to generate a new channelization code the
Walsh code is multiplied with one of the three QOF. All channelization codes which are
generated with the same quasi-orthogonal function are orthogonal amongst them-
selves. All other channelization codes have a constant and minimal cross correlation to
these codes. Thus the name quasi-orthogonal functions.
QOF is only used for the following forward physical channels: Forward Fundamental
Channel (F-FCH), Forward Supplemental Channel (F-SCH) and Forward Dedicated
Control Channel (F-DCCH). For more details see 3GPP2 C.S0002-C, chapter
3.1.3.1.15.
Table 4-5: Masking Functions for Quasi-Orthogonal Functions with Length 256
Function
Masking Function
Hexadecimal Representation of QOF
sign
Walsh
rot
0
000000000000000000000000000000000000000000000000000
0000000000000
W
0
256
1
7228d7724eebebb1eb4eb1ebd78d8d28278282d81b41be1b411
b1bbe7dd8277d
W
130
256
2
114b1e4444e14beeee4be144bbe1b4eedd872d77882d78dd228
7d277772d87dd
W
173
256
3
1724bd71b28118d48ebddb172b187eb2e7d4b27ebd8ee82481b
22be7dbe871bd
W
47
256
4.2.9.3
Power Levels
The individual physical channel power and the OCNS power are expressed relative to
the total output power of the generator. The total power of all active physical channels
(excluding OCNS channels) is called "accumulated power".
If the accumulated power is smaller than the output power of the generator, this gap is
filled by Orthogonal Channel Noise Simulator (OCNS) channels. The OCNS is used to
simulate the users or control signals on unused channelization codes.
General Description
深圳德标仪器
135-1095-0799
