Agilent Technologies E8257C PSG Guía de usuario descargar pdf (Pagina 213)

Chapter 7 199

Custom Real Time I/Q Baseband

Working with Differential Data Encoding

Editing the Differential State Map

1. Press

1 > Enter.

This encodes the first symbol by adding a symbol table offset of 1. The symbol rotates forward

through the state map by 1 value when a data value of 0 is modulated.

2. Press

+/– > 1 > Enter.

This encodes the second symbol by adding a symbol table offset of –1. The symbol rotates

backward through the state map by 1 value when a data value of 1 is modulated.

NOTE At this point, the modulation has one bit per symbol. For the first two data values (00000000

and 00000001) only the last bits (the 0 and the 1, respectively) are significant.

3. Press

2 > Enter.

This encodes the third symbol by adding a symbol table offset of 2. The symbol rotates forward

through the state map by 2 values when a data value of 10 is modulated.

4. Press

0 > Enter.

This encodes the fourth symbol by adding a symbol table offset of 0. The symbol does not rotate

through the state map when a data value of 11 is modulated.

NOTE At this point, the modulation has two bits per symbol. For the data values 00000000,

00000001, 00000010, 00000011, the symbol values are 00, 01, 10, and 11 respectively.

Symbol Table Offset Values Entry Area

Data

1 2 ... 208 209 210 211 212 213 214 215 216 217 218 ... 317 318

Sin comentarios

Agilent Technologies E8257C PSG Guía de usuario Pagina 213