When setting up an 802.16 OFDM demodulation measurement, there are several things to consider. This topic describes how to connect your signal to an 89600 VSA and successfully demodulate digital signals. The information is provided in the following order:
The VSA will configure the other signal parameters as shown in Using Standard Setups/Presets.
These parameters can be manually adjusted or specified in the IEEE 802.16 OFDM Demod Properties dialog box.
For all receiver configurations except
, connect your signal to Channel 1. In this case, the VSA assumes that your signal contains both the I and Q components (the carrier signal). If the measurement hardware has two input channels, the VSA ignores the second input channel.If your measurement hardware has a second input channel, the raw I (In-phase) and Q (Quadrature- phase) signals can be connected. To do this, click
.Notes for I+jQ input:
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The Input Range must be set correctly to obtain accurate measurements. that are too low overload the VSA's ADC. Input ranges that are too high increase noise, which increases errors reported in error summary data, such as EVM.
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The VSA's kHz of the transmitted carrier frequency or the VSA may not be able to lock onto your signal.
should be set to within approximately ±500The VSA
must be within 2 * Subcarrier Spacing (625 kHz for 802.11a or HIPERLAN/2) to lock properly.Return to Top of Page.
See Also
Selecting the 802.16 OFDM Demodulator
Using Standard Setups/Presets (802.16 OFDM)
Time and Frequency Parameter Lookup Table (802.16 OFDM)
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