Agilent Technologies 89410A User Manual

You may use the analyzer to create custom arbitrary waveforms
corresponding to digital communication signals. Since the I/Q reference
signal is the ideal representation of a format type, a properly saved version
of the reference signal provides an ideal waveform. The internally
generated waveforms may be used as test signals (to test an amplifier, for
example).
The following guidelines may help you create a model arbitrary waveform:
l You cannot use this procedure to create 8 VSB or 16 VSB signals.
l This procedure is unreliable with 64 QAM, 64 DVB QAM, or 256 QAM signals.
You may or may not be able to create a valid signal using these formats.
l You must be sure that no external signal is applied to channel 1—the
analyzer’s internal noise is used to create the signal.
l Although span is irrelevant in creating signals, a span of twice the symbol rate
results in faster demod updates when you play back the waveform.
l Points per symbol should be either 5 or 10 (if you are creating an MSK signal
you must use at least 10 points per symbol).
l You should use a result length which is at least 10 symbols longer than what
you want to use as a test signal. This permits a 5 symbol truncation at each end
of the record to eliminate possible invalid data caused by discontinuities
between the beginning and end of the waveform. For theoretically complete
settling, approximately 5 symbols are neeed at each end of the waveform.
However, burst system specifications disregard settling issues because it is
impossible to instantly settle a Nyquist filter. The majority of the settling is
complete after 1 symbol. With five symbols of settling, the effect on error vector
magnitude is below algorithm residual error for a root raised cosine measure
filter.
l You must select IQ reference time.
l If you select a modulation type which employs distributed filtering, you must
select an appropriate filter type. For example, some format types define the
reference filter as a raised cosine type, since the reference must normally
account for square root filtering in the transmitter and square root filtering in
the receiver. The cascade of the two is full filtering. However, to simulate a
transmitter, only half filtering, that is, square root filtering should be used.
Therefore, when you save this type of reference you must define the filter type
as root raised cosine so that when you play it back as a stimulus it is partially
filtered, allowing the demodulator to apply the additional filtering.
Creating User-defined Signals (Options AYA and AYH)
11 - 3

Agilent Technologies 89410A Specifications

General

Brand	Agilent Technologies
Model	89410A
Category	Measuring Instruments
Language	English

Summary

The Analyzer at a Glance

Front Panel

Details the various controls and connectors on the analyzer's front panel.

Saftey Summary

Safety Symbols

Explains the meaning of various safety symbols used in the manual.

Options and Accessories: Agilent 89410A

Add PC-Style Keyboard and Cable

Lists options for adding a PC-style keyboard and cable with different language versions.

Notation Conventions

In This Book

1 Demodulating an Analog Signal

To perform AM demodulation

Step-by-step guide to performing AM demodulation on a sample signal.

To perform PM demodulation

Step-by-step guide to performing PM demodulation on a sample signal.

To perform FM demodulation

Step-by-step guide to performing FM demodulation on a sample signal.

2 Measuring Phase Noise

To measure phase noise

Procedure for measuring phase noise using simulated input signal from time capture.

3 Characterizing a Transient Signal

To set up transient analysis

Demonstrates methods for characterizing transient signals using arbitrary source signals.

To analyze a transient signal with time gating

Explains how to analyze transient signals using time gating features.

4 Making On/Off Ratio Measurements

To set up time gating

Steps to set up time gating for measuring on/off ratio of a burst signal.

To measure the on/off ratio

Procedure to measure the on/off ratio of a burst signal using time gating.

5 Making Statistical Power Measurements

To display CCDF

Procedure to display the Complementary Cumulative Density Function (CCDF).

To display peak, average, and peak/average statistics

How to display peak, average, and peak-to-average statistical power measurements.

6 Creating Arbitrary Waveforms

To create a waveform using a single, measured trace

Steps to create short arbitrary waveforms from a single measured trace.

To create a waveform using multiple, measured traces

Guide to creating long arbitrary waveforms using multiple measured traces.

To create a short waveform using ASCII data

Procedure for creating short waveforms using ASCII data.

7 Using Waterfall and Spectrogram Displays (Opt. AYB)

To create a test signal

Creates a test signal to demonstrate waterfall and spectrogram features.

To set up and scale a waterfall display

Instructions on how to set up and scale waterfall displays.

To select a trace in a waterfall display

Procedure to select specific traces within a waterfall display.

To set up a spectrogram display

Guide on how to set up and view a spectrogram display.

8 Using Digital Demodulation (Opt. AYA)

To prepare a digital demodulation measurement

Steps to set up a digital demodulation measurement using a NADC signal.

To demodulate a standard-format signal

How to demodulate the NADC signal using standard format parameters.

To set up pulse search

Learn how to perform pulse search on a burst signal.

9 Using Video Demodulation (Opt. AYH)

To prepare a VSB measurement

Procedure to load and view an 8 VSB signal for measurement.

To determine the center frequency for a VSB signal

How to determine the correct center frequency for VSB measurements.

To demodulate a VSB signal

Steps to demodulate a VSB signal using specific parameters.

10 Analyzing Digitally Demodulated Signals (Options AYA and AYH)

To demodulate a non-standard-format signal

Guide to demodulating non-standard signals using digital demodulation.

To use polar markers

How to select polar-marker format and units for analysis.

To view a single constellation state

Steps to reposition a constellation state to the center and zoom in.

11 Creating User-defined Signals (Options AYA and AYH)

To create an ideal digitally modulated signal

Procedure to create an ideal digitally modulated signal using noise and reference signals.

To create a user-defined filter

How to create custom filters for measured or reference signals.

12 Using Adaptive Equalization (Options AYA and AYH)

To determine if your analyzer has Adaptive Equalization

Steps to check if the analyzer has the required options for Adaptive Equalization.

To apply adaptive equalization

Steps to apply adaptive equalization to a demodulated multi-path signal.

13 Using Wideband CDMA (Options B73, B79, and 080)

To view a W-CDMA signal

Steps to view W-CDMA signal in Vector mode to verify settings.

To demodulate a W-CDMA signal

Procedure to demodulate W-CDMA signals, adjusting parameters as needed.

To view data for a single code layer

How to view code-domain power for a single code layer.

14 Using the LAN (Options UTH & UG7)

To determine if you have options UTH and UG7

Steps to check for UTH and UG7 LAN options on the analyzer.

To connect the analyzer to a network

Guide to connecting the analyzer to a network via LAN.

To set the analyzer’s network address

Procedure for setting the analyzer's IP address and subnet mask.

To transfer files via the network

Instructions for transferring files to and from the analyzer via FTP.

15 Using the Agilent 89411A Downconverter

The Agilent 89411A at a Glance

Provides an overview of the Agilent 89411A Downconverter's front panel and block diagram.

Calibration

Steps to calibrate the system by connecting the 89410A and 89411A.

16 Extending Analysis to 26.5 GHz with 20 MHz Information Bandwidth

Overview

Introduces extending analyzer capabilities with the HP/Agilent 71910A wideband receiver.

System Configuration

Outlines the components and software for creating a wideband system.

System Connections

Illustrates system connections for various configurations.

17 Choosing an Instrument Mode

Why Use Scalar Mode?

Explains when to use Scalar Mode for measurements.

Why Use Vector Mode?

Details the benefits and applications of Vector Mode for measurements.

Why Use Analog Demodulation Mode?

Explains the capabilities and applications of Analog Demodulation Mode.

18 What Makes this Analyzer Different?

Time Domain and Frequency Domain Measurements

Explains the fundamental differences between time and frequency domain measurements.

FFT analyzers

Explains the principles and advantages of FFT analyzers.

19 Fundamental Measurement Interactions

Measurement Resolution and Measurement Speed

Details how resolution, speed, and display are interconnected.

Bandwidth coupling

Discusses linking resolution bandwidth and frequency span.

Windowing

Explains time-domain weighting functions and their effects.

20 Analog Demodulation Concepts

Special Considerations for Analog Demodulation

Outlines conditions and constraints for analog demodulation.

Time Correction and Analog Demodulation

Explains the role of time correction in analog demodulation.

The Importance of Span Selection

Details how span selection affects analog demodulation results.

21 Gating Concepts

What is Time Gating?

Explains the availability and purpose of time gating.

How Does it Work?

Details the parameters and process of time gating.

22 Digital Demodulation Concepts (Opt. AYA)

Carrier locking

Discusses achieving reliable carrier lock for QAM signals.

Special considerations for sync search

Explains using synchronization patterns to isolate signal portions.

23 Video Demodulation Concepts (Opt. AYH)

Carrier locking and pilot search: VSB

Details carrier locking and pilot search for VSB signals.

Span considerations

Explains how span affects measurements and carrier lock.

24 Wideband CDMA Concepts (Options B73, B79, and 080)

Setting up a W-CDMA Measurement

Guide to configuring the analyzer for W-CDMA signal demodulation.

Troubleshooting W-CDMA Measurements

Lists common W-CDMA measurement problems and their solutions.