IQ Signal Master™ MX280005A Vector Signal Analysis Software Help : Basic Operation : Modulation Parameters Tab : Search
 
Search
Set the Search parameter that determines the symbol positions in the slot. The search parameters can be set when Frame Formatted has been selected. Press the Search button to display the dialog box as shown in Figure: Search Parameter Setting Dialog Box.
Search Parameter Setting Dialog Box
The Search dialog settings are described in Figure: Search Settings.
Search Settings
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Sync Word Search
Sets whether to search for a sync word consisting of a specific pattern. This setting is switched on or off by selecting a radio button. By executing a sync word search, the position of symbols in slots can be accurately detected.
Burst Word Search
Sets whether to detect burst signals. This setting is switched on or off by selecting the radio button. Set Burst Search to ON when a burst signal that makes up a ramp between slots is measured. Burst Search executes using Input Level (–20) dB as the level threshold.
Word Search Tabs
1st Word opens the 1st word search settings tab. The 2nd Word tab is enabled by clicking on the ‘2nd Word Search’ button from the 1st tab. The tabs setting for each are the same except the 2nd word tab dos not have the “2nd word button”. Two types of Sync word patterns can be set. The settings on the 1st Word and 2nd Word tabs can be switched.
Search Slot
Sets the number of the slot in which a sync word was detected. Detection starts from the position at which the measured signal was captured, and a slot number is set for the position at which a sync word was first detected. If the same sync word is set in multiple slots, the detected slot number might differ from the actual slot number. To detect the actual slot number, use an external trigger.
Range: 10 to (Slot Length – Measurement Offset)
Sync Word Length
Sync Word Offset
Sets the sync word. Specify the sync word as a left-aligned hexadecimal value, assuming the first bit in the sync word to be the MSB.
Number of Characters: (Sync Word Length) × (Bits per symbol)/4, and round it up to the whole number.
Word: 0 to F (HEX)
Sync Word Offset
Sets the interval between the first symbol in the slot and the first symbol in the sync word, in symbols.
Range: 0 to (Slot Length (Symbol) - Sync Word Length (Symbol))
Sync Word Length
Sets the length of the sync word in Symbols. The length varies according to the Modulation Type setting and the character number of the input sync word (HEX).
Range
The value for the sync word length needs to satisfy the Ranges listed in Table: Range for Sync Word Length (Modulation Type) and Table: Range for Sync Word Length.
Range for Sync Word Length (Modulation Type)
Modulation Type
Range (symbol)
BPSK, DBPSK, PI/2DBPSK, 2FSK, 2ASK, MSK
1 to (128 or Slot Length, whichever is smaller)
QPSK, O-QPSK, DQPSK, PI/4DQPSK, 4FSK, H-CPM, 4ASK
1 to (64 or Slot Length, whichever is smaller)
8PSK, D8PSK
1 to (42 or Slot Length, whichever is smaller)
16QAM, 16APSK
1 to (32 or Slot Length, whichever is smaller)
32QAM, 32APSK
1 to (25 or Slot Length, whichever is smaller)
64QAM
1 to (21 or Slot Length, whichever is smaller)
128QAM
1 to (18 or Slot Length, whichever is smaller)
256QAM
1 to (16 or Slot Length, whichever is smaller)
512QAM
1 to (14 or Slot Length, whichever is smaller)
1024QAM
1 to (12 or Slot Length, whichever is smaller)
2048QAM
1 to (11 or Slot Length, whichever is smaller)
The Sync Word Length (Number of characters of Sync Word (HEX)) is shown in Table: Range for Sync Word Length, Note that the decimal point is suppressed.
Range for Sync Word Length
Item
Value (symbol)
Maximum
(Number of characters of Sync Word (HEX)) × 4 / (Bits per symbol)
Minimum
{(Number of characters of Sync Word (HEX)) – 1) × 4 / (Bits per symbol)} + 1
Bits per symbol of Modulation Type is shown in Table: Bits per symbol of Modulation Type.
Bits per symbol of Modulation Type
Modulation Type
Bits/Symbol
BPSK, DBPSK, PI/2DBPSK,2FSK, 2ASK, MSK
1
QPSK, O-QPSK, DQPSK, PI/4DQPSK, 4FSK, H-CPM, 4ASK
2
8PSK, D8PSK
3
16QAM, 16APSK
4
32QAM, 32APSK
5
64QAM
6
128QAM
7
256QAM
8
512QAM
9
1024QAM
10
2048QAM
11