Please refer to the User Guide for information on selecting the WCDMA/HSDPA Signal Analyzer mode, setting up frequency, amplitude, power offset for compensating external loss, limit lines, markers, and file management.
In Auto mode the unit automatically locks on to the strongest scrambling code in the signal. In Manual mode the desired code is manually entered and the unit looks only for that specific scrambling code.
In a WCDMA system, the number of chips per data symbol is called the Spreading Factor. The lower the spreading factor the higher the data rate. According to the 3GPP standard, the spreading factor can vary from 4 to 512 and the maximum spreading factor is either 256 or 512. The instrument can be set to 256 or 512 maximum spreading factors. To set up the maximum spreading factor:
In the 3GPP specification, two optional control channels are provided for S-CCPCH and PICH. These codes can have different spreading codes and spreading factors. The S-CCPCH spreading factor and S-CCPCH and PICH codes can be manually entered.
The threshold level is an advanced setting that can be set to indicate which codes are considered active. In the Code Domain Power screen the threshold level is indicated by a horizontal dotted red line. Any code channels exceeding this power level are considered active traffic channels and any code channels below this power level are considered inactive or noise. The threshold level can be manually set by:
The ACLR measurement uses the filtered channel power to determine the ACLR values and it is listed as filtered on the display. In all other screens the unfiltered channel power is displayed as channel power.
