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Abstract

A spread-spectrum-correlator apparatus including a symbol-shift register, an in-phase-symbol correlator, a quadrature-phase-symbol correlator, a frame-shift register, an in-phase-frame correlator, a quadrature-phase-frame correlator, and a control processor. The symbol-shift register circulates replicas of a header-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 and the quadrature-phase-frame correlator 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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First Claim