Enhanced Functions For Digital Standard 3GPP W-CDMA (FDD)
SMIQ
1125.5555.03
2.244
E-9
2.15.3.1.3
Bit Error Insertion
Errors can be inserted in the data source or the CRC checksum for testing the bit/block error rate tester.
If channel coding is inactive (CHANNEL CODING STATE = OFF), the data bits are fed into the slots at the
physical level. If channel coding is active (CHANNEL CODING STATE = ON), the data bits are fed at the
transport layer level. The bit errors are always generated at the data source level.
INSERT BIT ERRORS
IN DATA
Switch used to activate or deactivate the insertion of bit errors in the data fields
of all active enhanced channels at the frequency indicated under the NOMINAL
BIT ERROR RATE parameter.
In the OFF state, the following menu parameters NOMINAL BIT ERROR
RATE and RESULTING BIT ERROR RATE are not effective.
IEC/IEEE-bus
:SOUR:W3GP:BST:ENH:DERR:BIT:STAT ON
NOMINAL BIT
ERROR RATE
Sets a user-defined bit error rate in the range of 10
-1
to 10
-7
with which the bits
can be inserted into the data fields of the enhanced channel timeslots. Upon
readout of the data source individual bits are inverted at random at a given
error rate to simulate an erroneous signal.
Since the bit error rate set by the user may not be adhered to as a function of
the frame SEQUENCE LENGTH and the selected SYMBOL RATE DPCH or
OVERALL SYMBOL RATE, the actual bit error rate is displayed in the next
line, i.e. RESULTING BIT ERROR RATE.
IEC/IEEE-bus
:SOUR:W3GP:BST:ENH:DERR:BIT:RATE 2E-3
RESULTING BIT
ERROR RATE
Parameter indicating the resulting bit error rate used to insert the bits into the
data fields of the enhanced channel timeslots (see NOMINAL BIT ERROR
RATE parameter).
CHANNEL CODING STATE = OFF:
The BER of DPCH is displayed here.
IEC/IEEE-bus
:SOUR:W3GP:BST:ENH:DERR:BIT:DPCH?
CHANNEL CODING STATE = ON:
The BER of DTCH and DCCH is displayed here.
IEC/IEEE-bus
:SOUR:W3GP:BST:ENH:DERR:BIT:DTCH?
IEC/IEEE-bus
:SOUR:W3GP:BST:ENH:DERR:BIT:DCCH?
