Agilent Technologies N1911A Bedienungsanleitung PDF herunterladen (Seite 21)

Instructions Keystrokes

On the P-Series:

1. Select the WiMAX predeﬁ ned

preset value.

[Preset], press [

or ] key to

choose {WiMAX}. [Select], {Conﬁ rm}.

2. Set the trace display. [Disp], {Disp Type}, {Trace}.

3. Set the trigger holdoff 4 ms. [Trig/Acq], {Settings}, {1 of 2}, {Hold-

off 4 ms}.

4. Expand the window. Change the

scale. Move the marker to

measure 5 ms waveform duration.

Once the complete waveform on

the screen within 5 ms markers

1 and 2, stop the triggering

(See Figure 22).

[ ], {Trace Control}, {X Start

–400 µs, X Scale 600 µs & Y Scale

10 dB}, {Gate Control}. Press [

] to allocate marker 2 and [ ] to

allocate marker 1 within 5 ms time

duration. [Run/Stop]

Measuring both Downlink &

Uplink Waveform

The Signal Studio under Downlink step

reveals that the frame duration of

5 ms (see Figure 23). Moving the

cursor around the frame zone reveals

the time duration and power level of

the Preamble, DL, TTG, UL & RTG as

shown below:

• Preamble = 0.104 ms / 1 sym

• DL = 2.06 ms / 20 sym(s)

• TTG = 0.34 ms

* UL = 1.53 ms / 15 sym(s)

• RTG = 0.957 ms

Preamble region shows 0 dB. In DL

zone there are 3 different power levels:

i) –3.98 dB when the FCH and Burst 1

is one (just after the Preamble)

ii) –4.46dB when only Burst 1 is ON

ii) –10.27dB from the end of burst 1 to

the end of the zone. (Same as DL

waveform setup)

The UL zone shows two different

power levels:

i) –4.45 dB when only burst 1 is ON

ii) –4.58 dB from the end of burst 1 to

the end of the UL zone.

Figure 22 WiMAX waveform duration of 5ms for both DL &UL in

TDD mode

Figure 23 Frame duration (5 ms) of both DL & UL waveform captured from Signal Studio

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