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3-104
Real-Time I/Q Baseband Generator User’s and Programming Guide
Softkey Reference
ESG Family Signal Generators
G
Options UN8 and 202
Gray Coded QPSK
This softkey appears in two different situations, enabling you to either
select a modulation, or load an I/Q map into the I/Q table editor.
Selecting a Gray Coded QPSK Modulation
Press this softkey to select Gray Coded QPSK (quadrature phase shift
keying) to modulate a continuous stream of the selected data pattern.
Gray Coded QPSK modulation transmits data at the rate of 2 bits per
symbol. The constellations for this modulation type are designed so that
adjacent symbols differ by only one bit. The modulation selection
appears in the
Mod Type
field in the text area of the display, and under
the
Select
,
PSK
, and
QPSK and OQPSK
softkeys in the Modulation Type
menus.
Softkey Locations
Custom:
Mode
>
Custom
>
Modulation Type
>
Select
>
PSK
>
QPSK and OQPSK
>
Gray Coded QPSK
Other Formats:
Mode
>
TDMA
>
desired format
>
Modify Standard
>
Modulation Type
>
Select
>
PSK
>
QPSK and OQPSK
>
Gray Coded QPSK
Loading an I/Q Map
Press this softkey to load a Gray Coded QPSK (quadrature phase shift
keying) I/Q map into the I/Q table editor. For details on editing I/Q
maps, see “
Mapping Symbol Positions with the I/Q Table Editor
Custom:
Mode
>
Custom
>
Modulation Type
>
Define User I/Q
>
Load Default I/Q Map
>
PSK
>
QPSK and OQPSK
>
Gray Coded QPSK
Other Formats:
Mode
>
TDMA
>
desired format
>
Modify Standard
>
Modulation Type
>
Define User I/Q
>
Load Default I/Q Map
>
PSK
>
QPSK and OQPSK
>
Gray Coded QPSK
GSM
Pressing this softkey opens a menu of softkeys where you can generate
a pattern formatted in either a framed structure (where the data bits
are located in fields defined by the GSM protocol), or a sequence that
can be output one or more times.
Softkey Location:
Mode
>
TDMA
>
GSM
GSM 450 Base
This key selects GSM 450 Base as the frequency band for GSM or
EDGE. GSM 450 Base contains channels from 259 to 293.
Softkey Location:
Mode
>
TDMA
>
desired format
>
Freq Channels
>
Channel Band
>
GSM 450/850 Base
>
GSM 450 Base
Summary of Contents for ESG series
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