SMIQ Digital Standard 3GPP W-CDMA (FDD)
1125.5555.03 E-92.195
(TPC PATTERN READ
OUT MODE)
• Single + alt. 01: A bit is taken for each slot from the up to 24-bit long bit
pattern for the Transmitter Power Control field of the slots and entered the
bit stream several times (depending on the symbol rate. The specified bit
pattern is used once, then the TPC sequence is continued with 0 and 1
bits alternately (multiplied depending on the symbol rate, e.g. 00001111).
• Single + alt. 10: A bit is taken for each slot from the up to 24-bit long bit
pattern for the Transmitter Power Control field of the slots and entered in
the bit stream several times (depending on the symbol rate. The specified
bit pattern is used once, then the TPC sequence is continued with 1 and 0
bits alternately (multiplied depending on the symbol rate, e.g. 11110000).
The different modes can be used for example to set a mobile to a specific
output power (e.g. with pattern 11111) and then let it oscillate about this
power (using Single + alt. 01 or Single + alt. 10). Thus power measurements
on the mobile can be performed (with a quasi-constant power). In conjunction
with the option (Mis-)Use TPC for output power control (see below) the TPC
Read Out Mode can also be used for generation of various output power
profiles.
IEC/IEEE-bus command :SOUR:W3GP:BST2:TPC:READ CONT
MISUSE TPC FOR
OUTPUT POWER
CONTROL
TPC bits are used for W-CDMA to inform the called station if the transmit
power is being increased or decreased. If this option is activated, the given
pattern is being misused to vary one’s own transmit power over time. For each
slot, one bit of this pattern is taken to increase (bit = 1) or decrease (bit = 0)
the channel power by the stated power step (POWER STEP TPC). The upper
limit is 0 dB and the lower –60 dB. The following envelope occurs at a channel
power of 0 dB, a power step of 1.0 dB, the pattern "001110100000011" and
TPC Pattern ReadOut Mode Continuous:
Fig. 2-117 Dynamic change of channel power (continuous)
Note: Observe that the power change (as specified in the standard) is
always performed at the beginning of the slot pilot field.
IEC/IEEE-bus command :SOUR:W3GP:BST1:TPC:MIS ON
POWER STEP TPC Size of power step in dB, if option MISUSE TPC FOR OUTPUT POWER
CONTROL is activated. The value range is –10.0 dB to +10.0 dB.
IEC/IEEE-bus command :SOUR:W3GP:BST1:POW:STEP 1.0
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