| 摘要 |
A spread-spectrum-correlator apparatus including a symbol-shift register (29), an in-phase-symbol correlator (35), a quadrature-phase-symbol correlator (37), a frame-shift register (72), an in-phase-frame correlator (38), a quadrature-phase-frame correlator (39), and a control processor (46). The symbol-shift register (29) circulates replicas of a head-chip-sequence signal or data-chip-sequence signal, which are used for in-phase-symbol correlating and the quadrature-phase-symbol correlating. The in-phase-frame correlator (38) and the quadrature-phase-frame correlator (39) detect a despread-header-symbol-sequence signal and generate a maximum output signal which may be used as a data-start signal or for synchronizing the timing of the control processor as to when to trigger sampling of the analog-to-digital converter, to set which chip-sequence signal is circulated in the symbol-shift register, to control the output of the symbol correlator, to detect the data-symbol-sequence signal and other time-dependent processes.
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