Anritsu Series MS278XB operation manual MS278XB OM

Measurements Modulation Measurements

Below is a composite constellation along with the summary table. The composite constellation includes the effects of all active codes as well as noise. If there was only one active code, the constellation would be very simple—it would look like QPSK. As additional codes are added, the constellation gets more complex. This constellation is of Test Model 2, which is a fairly simple signal where only 7 codes are being transmitted out of a total possibility of 256 (or even 512) codes.

Figure 5-32.Composite Constellation with Summary Table of a Test Model

All of the summary measurements shown for QPSK are available. Additional summary measurements, such as Peak Code Domain Error (a required measurement), Rho, and a variety of power measurements, such as total power and the power in the Synchronizing channel (SCH) are also available. To perform a composite measurement on the uplink signal, check Uplink on the Base Station/User Equipment button in the WCDMA Graph Type dialog on the Composite tab.

MS278XB OM 5-55