CDMA2000 BTS Analyzer (Option K82) R&S FSL
1300.2519.12 4.332 E-11
Channel Constell
Selects the Channel Constellation result display.
The measurement provides information about the channel constellation at symbol level. It shows
the constellation of the modulated signals of the selected channel and PCG (see Select
Ch/PCG). Supported modulation schemes are BPSK, QPSK, 8PSK and 16QAM. In CDMA2000
the modulation scheme depends on the channel type. Inactive channels can be measured, but
the result is meaningless since these channels do not contain data.
The BPSK constellation points are displayed on the x-axis, while the constellation points of
QPSK and 16QAM are located on neither axis.
Fig. 4-39: Channel constellation diagram
Remote: CALC:FEED "XTIM:CDP:SYMB:CONS"
EVM vs Symbol
Selects the Symbol Error Vector Magnitude result display.
The result display provides information on the EVM for the selected channel and the selected
PCGs on symbol level. The number of symbols is in the range from 6 to 384 and can be
calculated like this:
Number of symbols = Number of chips in one PCG / ChannelSF / K, with
Number of chips in one PCG = 1536
Channel SF = 4, 8, 16, 32, 64 or 128
K = 1 for Antenna Diversity = OFF
K = 2 for Antenna Diversity
OFF
This calculation thus takes into account the results of a channel for a power control group. The
result is given in %. Inactive channels can be measured, but the result is meaningless since
these channels do not contain data. To set the channel and the PCG, use the Select Ch/PCG
softkey.
Fig. 4-40: Error vector magnitude on symbol level
Remote: CALC2:FEED "XTIM:CDP:SYMB:EVM"
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