Service manual

WLAN TX Measurements
R&S
®
FSV-K91/91n/91ac/91p
43Operating Manual 1176.7649.02 ─ 04
The Physical Channel results could not be calculated for one or both of the following
reasons:
●
The spatial mapping can not be applied due to a rectangular mapping matrix (the
number of space time streams is not equal to the number of transmit antennas).
●
The spatial mapping matrices are singular to working precision.
PPDUs are dismissed due to inconsistencies
"Hint: PPDU requires at least one payload symbol"
Currently at least one payload symbol is required in order to successfully analyze the
PPDU. Null data packet (NDP) sounding bursts will generate this message.
"Hint: PPDU dismissed due to a mismatch with the PPDU format to be analyzed"
The properties causing the mismatches for this PPDU are highlighted.
"Hint: PPDU dismissed due to truncation"
The first or the last burst was truncated during the signal capture process, for example.
"Hint: PPDU dismissed due to HT-SIG inconsistencies"
One or more of the following HT-SIG decoding results are outside of specified range:
MCS index, Number of additional STBC streams, Number of space time streams
(derived from MCS and STBC), CRC Check failed, Non zero tail bits.
"Hint: PPDU dismissed because payload channel estimation was not possible"
The payload based channel estimation was not possible because the channel matrix is
singular to working precision.
"Hint: Channel matrix singular to working precision"
Channel equalizing (for Burst Length Detection, fully and user compensated measure-
ment signal) is not possible because the estimated channel matrix is singular to work-
ing precision.
3.8 Measurement Result Types
3.8.1 IQ Impairments
This chapter provides an overview over the I/Q impairments for the R&S FSV-K91/91n.
●
chapter 3.8.1.1, "IQ Offset", on page 44
●
chapter 3.8.1.2, "Gain Imbalance", on page 44
●
chapter 3.8.1.3, "Quadrature Error", on page 46
Measurement Result Types