Gated Power Measurement Description; What Is A Gated Power Measurement; How Is A Gated Power Measurement Made - Agilent Technologies 8960 Series Reference Manual

Gated Power Measurement Description

What is a Gated Power Measurement?

Gated power measurements provide a graphical representation of the time response of the mobile station
average transmitter power during periods when the power is gated on. During power gated transmission,
power from the mobile station is delivered in bursts. A measurement mask delineates the boundaries that the
signal's amplitude trace must conform to.
Four views of the power versus time graph are available after the test set analyzes measurement data. The
resolution of the traces has been designed to provide detail at the most critical points in the trace. There are
four views available:
• Rise
• Fall
• Full
• Zoomed
The Rise (part of Rise/Fall) trace details the rising edge of the burst, from -15 uS to +10 uS relative to the
beginning of the burst. The beginning of the burst corresponds with the gated-on power control group clock
1
edge .
The Fall (part of Rise/Fall) trace details the falling edge of the burst, from 1237 to 1262 uS after the beginning
of the burst.
The Full (part of Full/Zoomed) trace encompasses the entire burst with decreased resolution. This trace spans
the time period from -15 uS to 1262 uS relative the beginning of the burst.
The Zoomed (part of Full/Zoomed) trace details the area highlighted by a vertical bar displayed on the Full
trace. This vertical bar can be positioned in any one of 14 locations along the entire length of the zoomed burst.
(The extreme left and right vertical bar positions encompass the Rise/Fall time periods.)
A marker displaying the power level (from +10 to -45 dB) at each time increment is provided for all traces
except for Full. If a gated power measurement fails, the marker will be automatically positioned at the first
fail point.
A measurement progress report, showing the number of measurements in a multi-measurement, is displayed
on the test set's screen in an "n/m" format. The number of measurements completed, n, increases from zero to
the total number of measurements which need to be made, m.

How is a Gated Power Measurement Made?

Each gated power measurement is triggered internally by the test set. During the gated power measurement,
a DSP (Digital Signal Processor) samples the signal and returns 5,625 amplitude versus time data points.
Traffic channel frames are subdivided into 16 1.25 mS segments, called power control groups. When
1.
the traffic data rate is set to half, quarter, or eighth, the mobile station transmits only during
randomly selected power control groups. These are referred to as "gated-on" power control groups.
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Gated Power Measurement Description
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