Custom Real Time I/Q Baseband

Working with Differential Data Encoding

1st

 

 

 

 

1st Symbol

 

5th Symbol

 

3rd Symbol

2nd

{

{

{

Data = 0011100001

 

 

{

{

 

2nd Symbol

 

4th Symbol

5th

4th

 

 

3rd

Data Value

Symbol Table Offset

 

 

00

 

+1

 

01

 

-1

 

10

 

+2

 

11

 

+0

When applied to the user- defined default 4QAM I/Q map, starting from the 1st symbol (data 00), the differential encoding transitions for the data stream (in 2- bit symbols) 0011100001 appear in the previous illustration.

As you can see, the 1st and 4th symbols, having the same data value (00), produce the same state transition (forward 1 state). In differential encoding, symbol values do not define location; they define the direction and distance of a transition through the I/Q State Map.

For instructions on configuring differential encoding, see “Understanding Differential Encoding” on page 177.

Using Differential Encoding

Differential encoding is a digital- encoding technique that denotes a binary value by a signal change rather than a particular signal state. It is available for Custom Real Time I/Q Baseband mode. It is not available for waveforms generated by Arb Waveform Generator mode.

The signal generator’s Differential State Map editor enables you to modify the differential state map associated with user- defined I/Q and user- defined FSK modulations. In this procedure, you create a user- defined I/Q modulation and then configure, activate, and apply differential encoding to the user- defined modulation. For more information, see “Understanding Differential Encoding” on page 177.

This section includes information on following:

•Configuring User- Defined I/Q Modulation

•“Accessing the Differential State Map Editor” on page 182

•“Editing the Differential State Map” on page 183

Chapter 7

181

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Agilent Technologies E8257D PSG, E8267D PSG manual Using Differential Encoding, 1st Symbol 5th Symbol
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E8267D PSG, E8257D PSG specifications

Agilent Technologies, a recognized leader in electronic measurement and communications solutions, offers a comprehensive range of signal generators, including the E8257D PSG (Pulsed Signal Generator) and E8267D PSG. These instruments are engineered to meet the demanding requirements of wireless communication, aerospace, defense, and various research applications.

The E8257D PSG is known for its versatility and reliability. It operates within a frequency range of 250 kHz to 40 GHz, making it suitable for a wide array of applications, from signal generation to vector modulation. With an output power capability of up to +30 dBm, it delivers high-quality signals with exceptional precision. Its low phase noise performance is especially critical for applications such as radar and communication system testing, where signal integrity is paramount.

One of the standout features of the E8257D is its advanced modulation capabilities, including analog and digital modulation schemes. This flexibility allows engineers to simulate real-world communications environments accurately. The PSG also features a built-in arbitrary waveform generator that enables users to create complex waveforms tailored to specific testing needs, providing a significant advantage in research and development.

On the other hand, the Agilent E8267D PSG is designed to cater to the needs of users requiring a combined signal generation and analysis solution. With the capability to generate signals from 250 kHz to 67 GHz, the E8267D is ideal for millimeter-wave applications, as well as testing next-generation wireless technologies.

This model includes features such as enhanced phase noise performance and faster switching speed, which are crucial for signal integrity in sophisticated networks. The instrument's intuitive user interface and powerful software integration facilitate effortless operation and automation, thereby improving workflow efficiency.

Both the E8257D and E8267D PSG instruments incorporate cutting-edge technologies such as low-noise microwave and RF components, as well as digital signal processing capabilities. They provide users with enhanced accuracy and reliability in their measurements.

In summary, Agilent Technologies' E8257D and E8267D PSG signal generators represent the pinnacle of precision in signal generation technology. With their extensive feature sets, advanced modulation capabilities, and robust performance specifications, these instruments are invaluable tools for engineers and researchers working across various high-tech industries.
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