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WCDMA Generator
R&S
®
CMW-KG4xx/-KM4xx/-KS4xx
906
User Manual 1173.9657.02 ─ 11
Channel type
Purpose
Properties
E-DCH Relative Grant
Channel (E-RGCH)
Transfer of uplink E-DCH relative
grants to the UE
SF = 128, 30 ksps
Same channelization code as E-HICH
E-DCH HARQ Indicator
Channel (E-HICH)
Transfer of uplink E-DCH HARQ
acknowledgement indicator to the
UE
SF = 128, 30 ksps
Same channelization code as E-
RGCH
The R&S
CMW uses the scheme defined in 3GPP TS 25.213 to spread and combine
the downlink channels (see figure below). For all physical channels except P-SCH and
S-SCH, the real-valued symbols are mapped to an I and Q branch. The I and Q
branches of each channel are spread to the chip rate using the same channelization
code c
SF,m
for both branches.
The complex-valued chip sequences are scrambled with primary or secondary scram-
bling codes S
p
or S
s
, weighted with individual factors G and then combined using com-
plex addition. The G factors are directly related to the individual channel levels set at
the instrument. See also
chapter 6.2.1.2, "Scrambling Codes"
The complex-valued synchronization channels P-SCH and S-SCH are not spread but
weighted separately and then added to the already combined signal.
Fig. 6-1: Channelization, scrambling, weighting and combining of downlink channels
General Description
深圳德标仪器
135-1095-0799