CDMA2000 BTS Analyzer (Option K82) R&S FSL
1300.2519.12 4.334 E-11
Channel Bitstream
Selects the Bitstream result display.
The result display provides information on the demodulated bits for the selected channel and the
selected PCGs. This calculation thus takes into account the results of a channel for a specific
PCG. All bits that are part of inactive channels 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 PCG, use the Select Ch/PCG 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.
Depending on the spreading factor (symbol rate) of the channel, a minimum of 12 and a
maximum of 384 symbols can be contained in a power control group. In case of an active
transmit diversity (Antenna Diversity) the values redeuce to the half. Depending on the
modulation type, a symbol consists of the following bits:
– BPSK: 1 bit (only the I–component is assigned)
– QPSK: 2 bits (I–component followed by the Q–component)
– 8PSK: 3 bits
– 16QAM: 4 bits
In accordance with the radio configuration and the channel type, there are BPSK and QPSK
modulated channels in the CDMA2000 system. For details refer to Relationship between
channel type and modulation type on page 4.305.
The order is shown in the following figure:
Fig. 4-43: Phasor diagram for QPSK, BPSK, 8PSK and 16QAM including bit values
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