R&S CMW-KG4 Series, Руководство пользователя, Страница: 904 / 988

WCDMA Generator
R&S
®
CMW-KG4xx/-KM4xx/-KS4xx
904 User Manual 1173.9657.02 ─ 11
The following sections provide detailed background information about the properties of
the WCDMA downlink signal. The
GUI Reference provides links to this background
information where required.
● Physical Channel Overview .................................................................................. 904
● Channel Structure ................................................................................................. 908
● Dedicated Channel Models ...................................................................................914
● Orthogonal Channel Noise Simulator (OCNS) ......................................................917
● Power Levels .........................................................................................................918
● Operating Bands ................................................................................................... 919
● Trigger Signals ......................................................................................................920
● Transmit Power Control (TPC) ..............................................................................921
6.2.1 Physical Channel Overview
The radio resources in a WCDMA system are divided into physical channels character-
ized by a specific carrier frequency, scrambling code, channelization code and dura-
tion. The time duration is defined in integer multiples of chips, slots and radio frames.
With a chip rate of 3.84 Mcps, a slot corresponds to 2560 chips. A frame consists of 15
slots, i.e. 38400 chips or 10 ms.
The generator provides a set of downlink physical channels sufficient for synchroniza-
tion of the UE and data transfer. In addition, it generates the PICH which is to be used
in many of the conformance tests described in 3GPP TS 34.121.
3GPP specifies different physical channel types. The channels are generated by map-
ping transport channel information into a physical channel and differ in their physical
parameters.
●
Common channels carry messages that are not directed at a particular UE; they
are point-to-multipoint channels.
●
Dedicated channels carry information related to a particular connection; they are
point-to-point channels.
●
Shared channels are dedicated channels shared by several UEs. At a given time, a
shared channel is assigned to one UE only, but the assignment may change within
a few timeslots.
An overview of the physical channels of the downlink generator signal is given in the
following table. The links in the first column point to additional channel-related informa-
tion. The third column lists some channel properties. If not mentioned otherwise both
primary and secondary scrambling code are allowed and the channelization code can
be set. The Spreading Factor (SF) and the symbol rate are indicated.
General Description
深圳德标仪器
135-1095-0799