Spectrum Analyzer Channel Measurements Panel

The Channel Measurements panel displays occupied bandwidth or adjacent channel power ratio (ACPR) measurements.

In addition to the measurements, the Channel Measurements panel has an expandable Channel Settings pane.

Measurement — The type of measurement data to display. Available options are Occupied BW or ACPR. See the Occupied BW (DSP System Toolbox) section for information on how Occupied BW is calculated. ACPR is the adjacent channel power ratio, which is the ratio of the main channel power to the adjacent channel power.

When you select Occupied BW as the Measurement, the following fields appear.

Channel Settings — Modify the parameters for calculating the channel measurements.
Channel Settings for Occupied BW
- Select the frequency span of the channel, Span(Hz), and specify the center frequency CF (Hz) of the channel. Alternatively, select the starting frequency, FStart(Hz), and specify the starting frequency and ending frequency (FStop (Hz)) values of the channel.
- CF (Hz) — The center frequency of the channel.
- Occupied BW (%) — The percentage of the total integrated power of the spectrum centered on the selected channel frequency over which to compute the occupied bandwidth.
Channel Power — The total power in the channel.
Occupied BW — The bandwidth containing the specified Occupied BW (%) of the total power of the spectrum. This setting is available only if you select Occupied BW as the Measurement type.
Frequency Error — The difference between the center of the occupied band and the center frequency (CF) of the channel. This setting is available only if you select Occupied BW as the Measurement type.

When you select ACPR as the Measurement, the following fields appear.

Channel Settings — Enables you to modify the parameters for calculating the channel measurements.
Channel Settings for ACPR
- Select the frequency span of the channel, Span (Hz), and specify the center frequency CF (Hz) of the channel. Alternatively, select the starting frequency, FStart(Hz), and specify the starting frequency and ending frequency (FStop (Hz)) values of the channel.
- CF (Hz) — The center frequency of the channel.
- Number of Pairs — The number of pairs of adjacent channels.
- Bandwidth (Hz) — The bandwidth of the adjacent channels.
- Filter — The filter to use for both main and adjacent channels. Available filters are None, Gaussian, and RRC (root-raised cosine).
Channel Power — The total power in the channel.
Offset (Hz) — The center frequency of the adjacent channel with respect to the center frequency of the main channel. This setting is available only if you select ACPR as the Measurement type.
Lower (dBc) — The power ratio of the lower sideband to the main channel. This setting is available only if you select ACPR as the Measurement type.
Upper (dBc) — The power ratio of the upper sideband to the main channel. This setting is available only if you select ACPR as the Measurement type.