User`s guide

64 E6651A User’s Guide
4 Signal Analyzer Mode
Modulation Analysis
Modulation Analysis mode of the E6651A Test Set displays
the Mobile WiMAX OFDM signal in both frequency and time
domain form. This is typically useful in the development of
Mobile WiMAX subscriber stations and repeaters. A detailed
description of these functions are provided here.
Mobile WiMAX Modulation Accuracy Analysis Window
The Modulation Accuracy Analysis Window displays the
Mobile WiMAX OFDM signal in both time and frequency
domain. The frequency domain graph provides information
on subcarriers including the number of subcarriers,
subcarrier usage, and the relative powers of subcarriers. The
time domain graph shows the length of an OFDM signal and
relative power of different parts of the signal. The I/Q
constellation graph shows the constellation for the currently
selected symbol. Access this window from the Uplink
Measurement Menu.
Figure 37 Modulation Accuracy Analysis Window
Three sub- windows are provided in the Modulation Accuracy
Analysis Window:
I/Q Constellation This displays the constellation of the currently selected
symbol.