Patent ID: 6393049
Filing Date: 2002-05-21
Classification: H04B,H04W

Abstract:
A spread-spectrum-matched-filter apparatus, for use as part of a spread-spectrum receiver on a received-spread-spectrum signal having a plurality of packets, with each packet of said plurality of packets generated from spread-spectrum processing a header-symbol-sequence signal with a chip-sequence signal and from spread-spectrum processing a data-symbol-sequence signal with the chip-sequence signal, comprising:code means for generating a replica of the chip-sequence signal; symbol-matched means, responsive to having a symbol-impulse response set from the replica of the chip-sequence signal, for filtering from the received-spread-spectrum signal, a header portion of the packet, to output a despread-header-symbol-sequence signal and, for filtering from the received-spread-spectrum signal, a data portion of the packet to output a despread-data-symbol-sequence signal; frame-matched means having a frame-impulse response matched to the header-symbol-sequence signal for filtering the despread-header-symbol-sequence signal and for generating a start-data signal in response to the despread-header-symbol-sequence signal matching the frame-impulse response; and control means, coupled to said symbol-matched means and said code means, responsive to the start-data signal, for setting said symbol-matched means with a replica of a data-chip-sequence signal for matching said symbol-matched means to the data-chip-sequence signal.