HFA3863IN96 Intersil Corporation, HFA3863IN96 Datasheet - Page 15

• Manufacturer Part Number: HFA3863IN96
• Description: Processor, Direct Sequence Spread Spectrum Base band Processor with Rake Receiver and Equalizer, Tape And Reel
• Manufacturer: Intersil Corporation

consecutive SQ1’s will cause the part to finish the acquisition
phase and enter the tracking phase.
Prior to initial acquisition the NCO is inactive (0Hz) and
carrier phase measurement are done on a symbol by symbol
basis. After acquisition, coherent DPSK demodulation is in
effect. After a brief setup time as illustrated on the timeline,
the signal begins to emerge from the demodulator.
It takes seven more symbols to seed the descrambler
before valid data is available. This occurs in time for the
POWER
RAMP
TX
2
AND INITIAL DETECTION
AGC SETTLE AND LOCK
20 SYMBOLS
15
FIGURE 10. ACQUISITION TIMELINE, NON DIVERSITY
VERIFY AND CIR/FREQUENCY
ESTIMATION AND CMF/NCO
56 SYMBOL SYNC
20 SYMBOLS
JAMMING
HFA3863
START SFD SEARCH
SFD to be received. At this time the demodulator is tracking
and in the coherent PSK demodulation mode so it will no
longer acquire new signals. If a much larger signal
overrides the signal being demodulated (a collision), the
demodulator will abort the tracking process and attempt to
acquire the new signal. Failure to find an SFD within the
SFD timeout interval will result in a receiver reset and
return to acquisition mode.
DESCRAMBLER
SEED
7 SYM
16 SYMBOLS
SFD
START DATA
SFD DET