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11 Occupied Bandwidth Measurement
Meas
•
RMS - returns a single value that is the average power on a root-mean-squared voltage scale
(arithmetic rms) of the data point values for the specified region(s) of trace data. See the following
equation.
For I/Q trace data, the rms of the magnitudes of the I/Q pairs is returned. See the following equation.
This function is very useful for I/Q trace data. However, if the original trace data is in dB, this function
returns the rms of the log values which is not usually needed.
Equation 4
RMS Value of Data Points for Specified Region(s)
where Xi is a data point value, and n is the number of data points in the specified region(s).
Equation 5
RMS Value of I/Q Data Pairs for Specified Region(s)
where Xi is the complex value representation of an I/Q pair, Xi* its conjugate complex number, and n is
the number of I/Q pairs in the specified region(s).
Once you have the rms value for a region of trace data (linear or I/Q), you may want to calculate the
mean power. You must convert this rms value (peak volts) to power in dBm:
•
SAMPle - returns the first data value (x,y pair) for the specified region(s) of trace data. For I/Q trace data,
the first I/Q pair is returned.
•
SDEViation - returns a single value that is the arithmetic standard deviation for the data point values for
the specified region(s) of trace data. See the following equation.
•
For I/Q trace data, the standard deviation of the magnitudes of the I/Q pairs is returned. See the
following equation.
Equation 6
Standard Deviation of Data Point Values for Specified Region(s)
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W-CDMA & HSPA Measurement Applications Reference
Summary of Contents for E6640A
Page 80: ...Table of Contents lxxx W CDMA HSPA Measurement Applications Reference ...
Page 188: ...3 Programming the Test Set Common Commands 188 W CDMA HSPA Measurement Applications Reference ...
Page 256: ...5 Mode Functions Mode Setup 256 W CDMA HSPA Measurement Applications Reference ...
Page 324: ...6 System Functions System 324 W CDMA HSPA Measurement Applications Reference ...
Page 369: ...8 Channel Power Measurement Auto Couple W CDMA HSPA Measurement Applications Reference 369 ...
Page 389: ...8 Channel Power Measurement Marker W CDMA HSPA Measurement Applications Reference 389 ...
Page 664: ...9 ACP Measurement Auto Couple 664 W CDMA HSPA Measurement Applications Reference ...
Page 669: ...9 ACP Measurement BW W CDMA HSPA Measurement Applications Reference 669 ...
Page 984: ...9 ACP Measurement View Display 984 W CDMA HSPA Measurement Applications Reference ...
Page 1001: ...10 Spectrum Emission Mask Measurement W CDMA HSPA Measurement Applications Reference 1001 ...
Page 1668: ...12 Code Domain Measurement Auto Couple 1668 W CDMA HSPA Measurement Applications Reference ...
Page 2354: ...14 QPSK EVM Measurement 2354 W CDMA HSPA Measurement Applications Reference ...
Page 2364: ...14 QPSK EVM Measurement Auto Couple 2364 W CDMA HSPA Measurement Applications Reference ...