WiMAX Signal Analyzerfor Anritsu RF and Microwave Handheld Instruments : Fixed WiMAX Signal Analyzer : Measurements Menu : Demodulator Menu
  
Demodulator Menu
Key Sequence: Measurements > Demodulator
Fixed WiMAX Demodulator Menu (1 of 2)
Constellation
Press the Constellation submenu key to set the demodulation to Constellation view. The constellation view shows the constellation of the demodulated data symbols over one frame. When demodulation is set to Constellation view, press this submenu key again to open the Constellation menu.
The constellations are color coded as follows:
BPSK is shown in orange
QPSK is shown in purple
16‑QAM is shown in green
64‑QAM is shown in yellow
Reference Points
Press this submenu key to display reference points for the various constellations. On is the default state.
Back
Press this submenu key to return to the Demodulator menu.
Spectral Flatness
Press this submenu key to show the spectral flatness data that is measured from the preamble at the channel estimation step. The deviation of the spectral flatness from the average of all the carriers is shown in dB.
A mask that conforms to the specification is overlaid on the trace. Green color on the mask indicates pass, and red color on the mask indicates regions of the mask where the signal fails.
The specification for the mask is:
0 to ± 50 subcarriers < ± 2 dB
± 50 to ± 100 subcarriers < + 2 dB, and – 4 dB
This mask is referenced from the average of all 200 subcarrier amplitude values. Absolute delta of the power between adjacent subcarriers is displayed as a numerical value in dB.
Demodulator Menu (Continued)
Fixed WiMAX Demodulator Menu (2 of 2)
EVM vs Sub Carrier
Press this submenu key to display the EVM (rms) values versus OFDM subcarriers. The pilot subcarriers are shown in orange.
EVM vs Symbol
Press this submenu key to display the EVM (rms) values versus OFDM symbols.
Modulation Summary
Press this submenu key to display a summary table of all of the modulation‑related numerical measurement results:
RCE (rms) in dB
RCE (pk) in dB
EVM (rms) in %
EVM (pk) in %
Freq Error in Hz
Freq Error (ppm)
Carrier Frequency in Hz
Base Station ID
Back
Press this submenu key to return to the Measurements Menu.