1xEV-DO BTS Analyzer (Option K84) R&S FSL
1300.2519.12 4.386 E-11
Depending on the modulation type, a symbol consists of the following bits:
– BPSK: 1 bit (only the I or the Q component is assigned; in case of complex mapping a 2BPSK
modulation is displayed with both the I and Q components)
– QPSK: 2 bits (I–component followed by the Q–component)
– 8PSK: 3 bits
– 16QAM: 4 bits
Depending on the channel type, the following modulation types are available:
Pilot: BPSK-I
MAC: BPSK-I / BPSK-Q
Preamble: BPSK-I
Data: QPSK / 8-PSK / 16QAM
All bits that are part of unassigned codes are marked as being invalid by means of dashes. For
16QAM modulation '----' is displayed, for 8PSK modulation '---', for QPSK '--' and for BPSK '-'. To
set the channel and the slot, use the Select Code Slot softkey.
A certain symbol can be selected by using the MKR key. By enetering a number, the marker will
jump to the selected symbol. If there are more symbols than the screen is capable of displaying,
the marker can also be used to scroll inside the list.
Remote: CALC:FEED "XTIM:CDP:BSTR"
Peak Code Domain Error
Selects the Peak Code Domain Error result display.
In this result display, the error between the test signal and the ideally generated reference signal
is projected to the base spreading factor. The unit of the y–axis is dB. You can not specify the
spreading factor; it is automatically set by the channel type.
The result display consists of the numeric value per slot for the peak code domain error. You
can set the number of slots in the Capture Length field. Subsequently, the Peak Code Domain
Error result display takes the whole signal (i.e. all channel types) into account over the entire
period of observation. The selected slot is marked in red.
Only the channels detected as being active are used to generate the ideal reference signal. If a
channel is not detected as being active, e.g. on account of low power, the difference between
the test signal and the reference signal is very large. The result display therefore shows a peak
code domain error that is too high for all slots. Distortions also occur if unassigned codes are
wrongly given the status of "active channel". To obtain reliable measurement results, select an
adequate channel threshold via the Inactive Channel Threshold field.
Remote: CALC:FEED "XTIM:CDP:ERR:PCD"
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