Chapter 4 91
Basic Digital Operation
Custom Modulation
Custom Real Time I/Q Baseband
The real-time mode simulates single-channel communication using user-defined modulation types along
with custom FIR filters, and symbol rates. Data can be downloaded from an external source into PRAM
memory or supplied as real time data using an external input. The Real-Time I/Q Baseband mode can also
generate pre-defined data formats such as PN9 or FIX4. A continuous data stream generated in this mode
can be used for receiver bit error analysis. This mode is limited to a single carrier. The Real-Time I/Q
Baseband mode:
• has more data and modulation types available than the Arb Waveform Generator mode.
• supports custom I/Q constellation formats.
• has the capability to generate continuous PN sequences for bit error rate testing (BERT).
• needs no waveform build time when signal parameters are changed.
For more information, refer to the custom arb section “Using the Arbitrary Waveform Generator” on page
372, the custom real time section “Using the Real Time I/Q Baseband Generator” on page 378 and the
section on “Digital Modulation” on page 24.
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