Service manual

WLAN TX Measurements
R&S
®
FSV-K91/91n/91ac/91p
13Operating Manual 1176.7649.02 ─ 04
Modulation measurements
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Constellation diagram
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Constellation diagram for each OFDM carrier
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I/Q offset and I/Q imbalance
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Carrier and symbol frequency errors
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Modulation error (EVM) for each OFDM carrier or symbol
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Amplitude response and group-delay distortion (spectral flatness)
Further measurements and results
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Amplitude statistics (CCDF) and crest factor
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Transmit spectrum mask
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FFT, also over a selected part of the signal, e.g. preamble
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Payload bit information
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Freq/Phase Err vs. Preamble
3.2 Basic Measurement Examples
This section provides step-by-step instruction for working through an ordinary mea-
surement. The following steps are described:
1. chapter 3.2.1, "Setting Up the Measurement", on page 13
2. chapter 3.2.2, "Performing the Main Measurement", on page 14
In this example, a DUT using IEEE 802.11a is be used. The DUT is connected to the
R&S FSV using the RF input of the R&S FSV. The DUT generates a signal modulated
using 16QAM.
3.2.1 Setting Up the Measurement
1. Activate the "WLAN" mode using the MODE > "WLAN" keys.
2. Press the "FREQ" key once to select and open the Demod Settings Dialog Box and
to activate the frequency input field.
Basic Measurement Examples