A-3 Fixed WiMAX Messages Appendix A —Error Messages
A-2 PN: 10580-00236 Rev. D WiMAX MG
A-3 Fixed WiMAX Messages
DL Short Preamble not found
When the software does not detect a Downlink short preamble in the burst, this message is
displayed on the screen. All Demodulation measurement results are cleared (‘--‘ is seen in the
result area). The short preamble is required for all Demodulation measurements.
The short preamble is also required for the Power versus Time trace to be synchronized but if
the preamble is not present, an unsynchronized time domain trace is displayed and all but
the Channel Power result is cleared.
The instrument will continue to check for the presence of the short preamble.
DL Long Preamble not found
When the software does not detect a Downlink long preamble in the burst, this message is
displayed on the screen. All Demodulation measurement results are cleared (‘--‘ is seen in the
result area). The long preamble is required for all Demodulation measurements.
The instrument will continue to check for the presence of the long preamble
FCH decoder failed
This message is displayed when there is an error detected in the FCH decoder that is used to
determine the base station ID.
A-4 Mobile WiMAX Messages
DL Short Preamble not found
When the software does not detect a Downlink short preamble in the burst, this message is
displayed on the screen. All demodulation measurement results are cleared (“--” is seen in the
result area). The short preamble is required for all demodulation measurements.
The short preamble is also required for the Power versus Time trace to be synchronized, but if
the preamble is not present, then an unsynchronized time domain trace is displayed, and all
data results are cleared except the Channel Power result. The instrument continues to check
for the presence of the short preamble.
Demodulation Error
This message is typically displayed if the input signal is a proprietary implementation of
Mobile WiMAX.
The Demodulation Error is displayed when the following conditions are not met:
• FFT size is 1024 or 512
• preamble index is within the range of 0 to 113
• modulation type is QPSK, 16QAM, or 64 QAM
• reserved bit is not zero in DL-MAP
• first zone is not PUSC
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