Rohde & Schwarz R&S FSL3 - Page 1428

R&S FSL TRACe Subsystem (1xEV-DO, K84)
1300.2519.12 6.669 E-11
Bitstream
The command returns the bitstream of one slot, i.e. it returns one value for every bit (either 0 or
1) in a symbol in the following order:
<bit 1>, <bit 2>,…, <bit n>,...
The number of returned bits depends on the modulation type. For BPSK modulated signals
there is one bit per symbol, for 2BPSK and QPSK signals there are 2 bits per symbol, for 8-PSK
modulated signals there are 3 bits per symbol and for 16QAM modulated signal there are 4 bits
per symbol. Accordingly, the bitstream per slot is of different lengths. The number of results is
between 2 and 400.
Peak Code Domain Error
The command returns two values for every slot in the following order:
<slot number>, <level value in dB>, <slot number>, <level value in dB>, …
The number of results corresponds to the IQ capture length. The number of results is between 2
and 12.
Code Domain Error
The command returns three values for every code in a channel in the following order:
<code number>,<error power >,< power ID>, ...
Return values
Value Description Range Unit
<code number> number of the code
<error power> value of the composite EVM %
<power ID> Power indication
0 – inactive channel, 1 – active channel
{0,1}
The number of results corresponds to the spreading factor. The spreading factor in turn
depends on the selected channel types. Therefore, 32 value triplets are returned for PILOT and
PREAMBLE channels, 16 value triplets for DATA channels and 64 value triplets for MAC
channels (see Characteristics of the 1xEV-DO channel types on page 6.664).
In addition, the output depends on the mapping settings. The output is either the I branch, the Q
branch or the complex signal. If Code Domain Overview is activated, trace 1 shows the I branch
and trace 2 shows the Q branch by default.
Symbol Constellation
The command returns two values, the real and imaginary parts, for every symbol in the following
order:
<re 0>, <im 0>, <re 1>, <im 1>, …, <re n>, <im n>, …
The number of results depends on the number of symbols and is between 2 and 100 (see
Characteristics of the 1xEV-DO channel types, column 'Number of symbols per slot and code'
on page 6.664).
EVM vs Symbol
The command returns one value for every symbol in the following order:
<value in % symbol 0>, <value in % symbol 1>, …
The number of results depends on the number of symbols and is between 2 and 100.