Anritsu Spectrum Master MS2720T, Руководство пользователя

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WiMAX MG PN: 10580-00236 Rev. D 2-1
Chapter 2 — Fixed WiMAX
Signal Analyzer
2-1 Introduction
Anritsu handheld instruments offer Fixed WiMAX RF measurements and Demodulator
measurements. Connect your instrument to any Fixed WiMAX base transceiver station (BTS)
for accurate RF and demodulator measurements. These instruments can measure both
FDD (Frequency Division Duplexing) and TDD (Time Division Duplexing) networks.
The instruments can measure WiMAX BTS transmitter performance over the air by
connecting an antenna or by connecting the BTS equipment directly to the instrument.
To connect the BTS equipment directly to the instrument, connect the power amplifier of the
BTS equipment to the RF In connector of the instrument by using a coupler or attenuator.
To measure a WiMAX signal over the air, connect the appropriate frequency band antenna to
the instrument RF In connector.
2-2 Fixed WiMAX Measurements
The following measurements can be made when the instrument is set to Fixed WiMAX mode.
Channel Power (RSSI)
Channel power measures the average time domain power within the selected bandwidth and
is expressed in dBm. Received Signal Strength Indicator (RSSI) is vendor-defined in the
standard and is typically the same as Channel Power.
Occupied BW
The occupied bandwidth is calculated as the bandwidth containing 99% of the transmitted
power.
Data Burst Power
Data Burst power is the RMS power over the data burst part of the WiMAX downlink
subframe.
Preamble Power
Preamble power is the RMS power over the preamble part of the WiMAX downlink subframe.
Crest Factor
Crest Factor is the ratio of the peak to average power over the entire downlink subframe.
Caution
The maximum (without damage) input level of the RF In port is +30 dBm. To
prevent damage, always use a coupler or a high power attenuator.
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