R&S CMW-KG8 Series, User Manual, Page: 932 / 964

CDMA2000 Generator
R&S
®
CMW-KG8xx/-KM8xx/-KS8xx
932 User Manual 1173.9511.02 ─ 11
6.2.5 Physical Channel Overview
A forward CDMA signal consists of multiple physical channels. All of them are transmit-
ted on the same nominal channel frequency and separated by the orthogonal Walsh
Codes (see also
Channelization Codes ).
The R&S CMW generator provides a forward CDMA signal which comprises Pilot
Channel (F-PICH), Synchronize Channel (F-Sync), Fundamental Channel (F-FCH) and
additional Orthogonal Channel Noise Simulator (OCNS) channel to fill up the total
CDMA output power.
Table 6-4: Forward channels generated by CDMA2000 generator
Physical
Channel Long Name Description
F-FCH Forward Fundamental Channel The F-FCH contains control data and user data.
F-PICH Forward Pilot Channel The F-PICH is transmitted continuously on the forward sig-
nal. It has always the channelization code
0
.
The F-PICH contains only
0
bits and the PN sequence is
short. Thus the mobile station synchronize to these
sequences to acquire the timing of the forward channel,
phase references for coherent detection and power refer-
ences for power schemes.
F-Sync Forward Sync Channel The F-Sync transmits the synchronization message for the
mobile station. The message contains the PN offset, the
system time, the long code status, information about the
paging channel, the system ID and the network ID.
F-Sync has always the channelization code
32
.
The data rate is always 1200 bps.
6.2.6 Power Levels
The individual physical channel power and the OCNS power 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". It is the average over all
channels within a slot.
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.
6.2.6.1 Level and Frame Rate Dependencies for F-FCH
The F-FCH level specifies the channel level for the Full frame rate. If a frame rate other
than Full is used, the actual test traffic level is lower:
Test traffic level = F-FCH Level + Corr.
The level definition for Full frame rate has been chosen because it is always valid,
even for speech connections where the frame rate varies according to the voice activ-
ity. The level correction values
Corr. are listed in the table below.
General Description
深圳德标仪器
135-1095-0799