msm7582b Oki Semiconductor, msm7582b Datasheet - Page 23

• Manufacturer Part Number: msm7582b
• Description: Pie/4 Shift Qpsk Modem
• Manufacturer: Oki Semiconductor

¡ Semiconductor
Demodulator Control Timing Diagram (Example)
(1) Control channel / synchronous burst (SS + PR = 64 bits)
(2) When synchronization is not established (for PS only)
(3) Communication channel (SS + PR = 8 bits)
Timing for CS
Timing for PS
Democulator unit
Modulator
input data
  
           


PDN2
SLS2
SLS1
AFC
RXD
RXC
PDN2
SLS2
SLS1
  


AFC
RXD
RXC
RXD
AFC
RPR
RCW
AFC
RPR
RCW
RXD
AFC
RPR
RCW
G G G G G G G G R R R R SS SS PR PR
G G G G G G G G R R R R SS SS PR PR
G
"0"
240 bits 625 ms
When the strength of the received wave is large
Slot 1
R1
"0"
"0"
"0"
"0"
R1
R1
  

  
G
For PS, the window is initially open to
wait for the control signal from CS.
RPR is closed after UW is detected.
56 bits
Slot 2
R2
"0"
"1"
R2
Less than 30 bits
8 bits
64 bits
G
PR
UW
PR
  
Slot 3
R3
"1"
"0"
UW
R3
When the strength of the received wave is small.
G
CR
CR
CR
CR
G
R
SS
PR
UW
CR
Slot 4
G G G G G G G G
G G G G G G G G
R4
"1"
"1"
R4
:
:
:
:
:
:
Guard bit
Ramp bit
Start symbol bit
Preamble bit
Unique word bit
CRC bit
MSM7582/7582B
G
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